JPH0229793A - Chord detector - Google Patents

Abstract

PURPOSE:To detect an accurate chord without ignoring a chord that a player intends by extracting plural possible chords among specified sound names and then determining a chord matching musical logic finally. CONSTITUTION:When new sound name information is inputted from a keyboard 10 to a chord extracting means, the extracting means extracts the chords based upon the specified sound names as root sounds temporarily. Then a chord determining means and a chord storage means determine a detected chord in specific advance relation with the last chord among the detected chords as a new determined chord. The chord information representing the new determined chord is stored in the chord storage means for next chord determination. The chord advance of a piece of music has its own advance mode based upon the musical logic and a specific chord advance is determined previously in consideration of the chord advance to determine the chord matching the musical logic finally.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention inputs a plurality of pitch name information each representing each pitch name constituting a musical scale, and also inputs a plurality of pitch name information that is input to a combined state of the pitch name information. The present invention relates to a chord detection device that detects a chord according to the chord.

[Prior Art] Conventionally, this type of device has been disclosed in, for example, Japanese Patent Application Laid-Open No. 53-26115.
As shown in the publication, it has a 12-bit shift register corresponding to a 12-tone scale, and each bit position of the shift register corresponds to a plurality of note names specified by simultaneous key presses on the keyboard. ′ is input, and the data in the shift register is input until the combination state of the parallel outputs of the shift register matches one of the various combination states corresponding to various chord types (major, minor, seventh, etc.). circularly shift a series of data. Then, when the combination states match, a chord type is determined according to the matched combination state,
By determining the root note of the chord according to the number of cyclic shifts until the matching occurs, a chord corresponding to the combination operation of each weight on the keyboard is detected.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional device, a chord is determined by detecting a match in the first combination state after the start of the cyclic shift, and therefore, if the cyclic shift is further carried out, other chords are determined. Even if there is a chord to be detected, the other chords will be ignored.

In such a case, there is no problem if the chord intended by the performer is the first chord detected, but if the other chord is the chord intended by the performer, an incorrect chord has been detected. become. In particular, when the number of chord types to be detected increases, or when the performer specifies chords that include tension notes, the combination of multiple note names becomes complex, and the frequency of the above-mentioned false detections increases. Become. Furthermore, if the performer makes a mistouch on the keyboard, the frequency will be even greater.

When such a chord is erroneously detected, the automatic accompaniment tones such as arpeggio tones and bass tones formed in response to the detected chord are no longer accurate, and the musicality of the automatic accompaniment tones is degraded.

The present invention was devised in view of such problems, and its purpose is to provide a chord detection device that accurately detects chords depending on the combination of a plurality of specified note names.

[Means for Solving the Problems] In order to solve the above problems and achieve the object of the present invention, the structural feature of the first invention (the invention according to claim 1 above) is that a chord representing a determined chord a chord storage means for storing information; and a chord storage means for storing information; and in response to input of new note name information, each specified note according to a combination state of a plurality of note names respectively specified by the input note name information. chord extracting means for extracting a plurality of detected chords by respectively detecting chords having the first name as a root note; chord determining means for determining a detected chord having a predetermined progression relationship from the previous chord represented by the chord information as a new determined chord, and storing chord information representing the newly determined chord in the chord storage means; It's about being prepared.

Further, the structural feature of the second invention (the invention according to claim 2) is that a key specifying means for specifying a key is added to the structure of the first invention, and the chord determination in the first invention is out of the plurality of detected chords extracted by the chord extracting means based on the key specified by the key specifying means and the previous chord represented by the chord information stored in the chord storage means; Chord determining means for determining a detected chord that has a predetermined progressive relationship between the previous chord and the designated key as a new determined chord, and storing chord information representing the newly determined chord in the chord storage means. This is because I replaced it with .

Further, the structural feature of the third invention (the invention according to claim 3) is that the key specifying means for specifying the key, and the combination state of a plurality of note names respectively specified by each input note name information. chord extracting means for extracting a plurality of detected chords by respectively detecting chords having each specified note name as a root note; The present invention further includes a chord determining means for determining a particular chord in the key specified by the specifying means as a determined chord.

Further, a structural feature of a fourth invention (the invention according to claim 4) is that the chord determining means in the second invention selects the detected chord from among the plurality of detected chords extracted by the chord extracting means. Newly determining, as a determined chord, a detected chord whose tension, which is determined according to the key specified by the key specifying means, has a predetermined relationship with the previous chord represented by the chord information stored in the chord storage means; The chord information representing the newly determined chord is replaced by chord determining means that stores chord information in the chord storing means.

Further, a structural feature of the fifth invention (the invention according to claim 5) is that the chord extraction means in the first, second, third, or fourth invention is a root note setting means for setting each root note as a root note, and a line name having a predetermined degree relationship from the set root note to each root note set by the root note setting means of the plurality of specified note names. and a determination means for determining whether or not it exists in the container.

Further, the structural feature of the sixth invention (the invention according to claim 6) is that the basic constituent tones of a chord are pre-defined for each chord as note names having a predetermined frequency relationship in the fifth invention. The reason is that I tried to remember it.

Moreover, the structural feature of the seventh invention (the invention according to claim 7) is that the key specifying means in the second, third, or fourth invention automatically changes the key according to the determined chord. This is because it is configured with a means for specifying detection.

Furthermore, the structural feature of the eighth invention (the invention according to claim 8) is that the key specifying means in the second, third, or fourth invention is a key specifying operator for specifying the key. It's because it's configured.

[Operation of the invention] In the first invention configured as described above, when new pitch name information is input to the chord extraction means, the extraction means extracts each of the plurality of pitch names specified by the chord extraction means as a root note. A plurality of chords are once extracted, and after the extraction, a chord determining means and a chord storing means select a detected chord that has a predetermined progression relationship from the previous chord among the extracted plural detected chords as a new determined chord. Once determined, chord information representing the newly determined chord is stored in the chord storage means for determining the next chord.

In such a case, the chord extraction means is configured, for example, as in the fifth or sixth aspect of the invention, and the extraction of the plurality of detected chords is performed by determining a predetermined degree relationship from each root note in the specified plurality of note names. This is done by determining whether or not a certain pitch name (previously stored pitch name) exists.

On the other hand, the chord progression in a song has a unique progression pattern based on music theory. For example, based on the theory of termination, the chord type changes from 7th or 7th sus Bendit 4 to major, and the root notes of the chord are spaced at semitone intervals. Descend by 7 or 1 step (from G7tfi to CMaJ or DIr)
) 7th (SUS4) to CMat), so
By paying attention to such chord progression and determining a predetermined chord progression in advance, chords that are compatible with music theory can be finally determined.

Further, in the second invention, the chord determining means also takes into account the key specified by the key specifying means, and selects a detected chord that has a predetermined progression relationship from the previous chord among the plurality of extracted detected chords. is determined as a new determined chord. In such a case, the key designation means is configured, for example, as in the seventh or eighth invention, and the key designation is automatically detected and designated in accordance with the determined chord, or in response to the operation of the key designation operator. specified.

If you use the key in this way, you can create a unique chord progression in the key, for example, from the related-obscured secondary dominant chord group to the secondary dominant sustain four-note group or the secondary dominant chord group (specifically, in the key of C, E++a7th to A7th (SUS4) or A-f, to, etc.), or from related ■obsubstituted secondary dominant chord group to substituent secondary dominant suspended 4th chord group or substituted secondary dominant chord group (specific Basically, in the key of C, A
Rath color DI) 7th (SUS4) or Db
It becomes possible to finally determine the chord according to the chord progression conditions to be transferred (to the 7th, etc.). As a result, in the second invention as well, chords that conform to music theory are finally determined.

Further, in the third invention, after extracting the plurality of detected chords, the chord determining means determines a specific chord in the key specified by the key specifying means from among the plurality of extracted detected chords as the determined chord. .

If you use keys in this way, you can create chords that frequently appear in keys, such as primary chords in minor keys, cadence chords, etc. (Specifically, in the key of C, Cs71tl+ D+++
7tJ+D+*, th (shi5), F 7th, etc.) can be determined as the determined chord. As a result, in the third invention as well, chords that conform to music theory are finally determined.

Further, in the fourth invention, after extracting the plurality of detected chords, the chord determining means determines the degree of tension determined according to the key specified by the key specifying means from among the plurality of extracted detected chords. A detected chord that has a predetermined relationship with the chord is newly determined as a determined chord. This makes it possible to determine chords that follow the tension line (the progression of chord tension) that normally constitutes a chord sequence in a piece of music. As a result, in the fourth invention as well, chords that conform to music theory are finally determined.

[Effects of the Invention] As can be understood from the above description of the operation, according to the first to eighth inventions, after a plurality of possible chords are extracted, a chord that conforms to music theory is finally determined. Even if there are many types of chords that can be detected, even if there is a slight mistouch on the keyboard, the chords intended by the performer will not be ignored, and musically accurate chords will be detected. will be done. Based on such accurate chords, automatic accompaniment tones such as arpeggio tones and bass tones that are appropriate for the music to be performed can be produced.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of the entire electronic musical instrument according to the present invention.

This electronic musical instrument includes a keyboard 10, a key setting operation panel section 20, a rhythm control operation panel section 30, and other operation panel sections 40.
It is equipped with The keyboard 1o consists of a plurality of keys for specifying chords, and the press and release of each weight is detected by the opening and closing of a plurality of key switches provided in the key switch circuit 10a corresponding to each weight. It has become. In addition, the key switch circuit 10a has a built-in chattering prevention circuit, a waiting time circuit, etc. 10 is excluded, and multiple key presses with a slight time lag are detected as simultaneous key presses, and the simultaneous key presses are detected as one key press event. The key setting operation panel section 20 has a key setting selection mode for selecting and switching between an auto mode in which the key is automatically set according to the chord played on the keyboard 1o, and a manual mode in which the key is specified by special key press operations on the keyboard 10. There are provided an operator 21, a major key operator 22 for specifying a major key in the manual mode, and a minor key operator 23 for specifying a minor key in the manual mode.

The operation on the key setting scratching panel section 2o is detected by a key setting switch circuit 20a, which includes a key setting selection switch 21a and a major key switch 22a corresponding to each of the operators 21 to 23, respectively. and a built-in minor key switch 23a. The rhythm control operation panel section 30 includes a rhythm selection operator group 31 for selecting rhythm types such as blues, march, waltz, etc., a start/stop operator 32 for specifying the start and stop of the rhythm, and a rhythm tempo, Operators 33 and 34 for specifying the volume etc. are provided, and these operators 3
Each of the operations 1 to 34 is detected by a switch, volume, etc. provided in the rhythm control switch circuit 30a. In addition, the operation panel section 4o includes a large number of operator groups 41 and 42 for selectively controlling the tone, volume, etc. of accompaniment sounds.
are provided, and each operation of these operator groups 41 and 42 is detected by other switches, volume controls, etc. provided in the switch circuit 40a.

These various switch circuits 10a to 40a are connected to a bus 50, to which a percussion instrument sound signal generation circuit 61, an accompaniment sound signal generation circuit 62, a tempo oscillator 70, and a microcomputer 80 are connected.

The percussion instrument sound signal generation circuit 61 has a plurality of percussion instrument sound signal forming channels for forming instrument sound signals corresponding to percussion instruments such as cymbals and bass drums, and receives percussion instrument sound data PIT supplied from the microcomputer 80 via the bus 50.
A percussion instrument sound signal corresponding to D+ to PITD is formed and output. The accompaniment sound signal generation circuit 62 is equipped with a plurality of series (n series) of musical sound signal forming channels each forming musical sound signals corresponding to musical instruments such as pianos and violins, and is supplied from the microcomputer 80 via the bus 50. According to the timbre data, pitch data, key-on signal KON, and key-off signal KOF, a musical tone signal having a timbre corresponding to the timbre data and a pitch corresponding to the pitch data is formed and output. These percussion instrument sound signal generation circuit 61 and accompaniment sound signal generation circuit 62 are connected to a sound system 63 consisting of an amplifier, speakers, etc.
3 generates musical tones corresponding to the musical tone signals from both signal generating circuits 61 and 62.

The tempo oscillator 70 outputs a rhythm interrupt signal RINT having a predetermined frequency to the microcomputer 80, and the frequency of the signal RINT is supplied from the microcomputer 80 via the bus 50 in response to the operation of the tempo operator 33. Determined according to tempo data.

The microcomputer 80 includes a program memory 81, a CPU 82, and a working memory 83, each connected to the bus 50. The program memory 81 is composed of a ROM, and stores a main program, its subprograms, and a rhythm interrupt program corresponding to the flowcharts shown in FIGS. 5 to 12. The CPU 82 starts executing the main program when a power switch (not shown) is closed, and repeatedly executes the program until the power switch is opened. When the rhythm interrupt signal RINT from the tempo oscillator 70 arrives, the CPU 82 starts executing the main program. Interrupt execution and execute the rhythm interrupt program. The working memory 83 is composed of a RAM, and has various registers and tables necessary for executing the program, as shown in FIGS. 2A to 2I.

These registers and tables are as follows.

Key press buffer register 83a (Fig. 2A) has a storage area for the number of keys that may be pressed at the same time, and in order to specify a chord, all C's are added to the key code representing each weight that is pressed at the same time. Remember.

Buffer register 83b for pressed key flags (FIG. 2B) Each storage area has the number of bits corresponding to 12 scales, and also has storage areas for the number of keys that may be pressed at the same time. Only the note names that correspond to the keys that the performer may have specified (chords that are possible based on the key pressed), excluding clearly unnecessary note names (misnotes), are marked as °'1''. A key press flag is stored for each chord that may be specified.

Chord detection buffer register 83c (Fig. 2C) has storage areas for the number of keys that may be pressed, and for each storage area, the root note ROOT of the chord that can be considered from the pressed key, and the type TYPE of the same chord. , the number of tension notes TENSU pressed for the same chord, the lowest tension note number LTNO with the lowest tension note number TNO among the pressed tension notes, and the chord tension level CTENL. Note that tension means tension, and tension notes are notes added to the basic constituent notes of a chord (for example, the l°, 3°k>, 5°, and 7φ notes in the case of a minor 7th chord).
For example, 9°, 11°). In this case, the tension note number TENSU is the number of the additional notes, and the tension note number TNO represents the degree of tension of each additional note, and as the number TN0 increases, the dissonance of the chord increases. The degree is set to increase (
(See Figures 3A and 3B). Furthermore, the chord tension level CTENL represents the tension of the chord itself, and the chord tension level CTENL is set so that the value is higher for chords that make you feel its presence, and lower for chords that you can listen to with peace of mind. (See Figure 3C).

Rotation register 83d (Fig. 2D) Only note names corresponding to keys pressed at the same time are '1'.

This is a 12-bit register corresponding to a 12-tone scale that stores key press flags, and each bit data is rotated for chord detection.

Root note counter 83e (Figure 2D) Counts up in synchronization with the rotation of the rotation register 83d, and counts up the root note ROO when a chord is detected.
Represents the key code KC of T.

Pressed key flag table 83f (FIG. 2E) Stores the past eight key pressed flags stored in the pressed key flag buffer register 83b, which are related to chords adopted as detected chords.

Chord table 83g (FIG. 2F) The root note ROOT, type TYPE, and chord tension level CTENL of the past eight chords are stored in correspondence with the key press flags stored in the key press flag table 83f.

Blues table 83h (Fig. 2G) Root tone ROOTX composed of 12 scales 6 types of chords (I), ■F, V7. l-7r ■sa7 + V
m7), and each memory area stores a flag indicating the existence of a corresponding chord at °°1°.

Key flag table 831 (Figure 2H) Root tone ROOTX composed of 12 scales 4 types of keys (major and minor keys for blues and major and minor keys other than blues)
It has a matrix-like storage area corresponding to , and each storage area stores the number of judgments on each side, which varies from "0" to "3".

The other register 83j (FIG. 21) temporarily stores the following variable data necessary for executing the program.

Performance start flag PSTF In order to detect the start time of a performance, 0'' represents before the performance starts (before the rhythm start), and '1'' represents after the performance starts.

Performance start minor flag I'STMF To be used for minor key detection, 1'' indicates that the chord at the start of the performance is a minor chord or minor seventh chord, and °0'' indicates that the same chord is other than that. represents something.

Buffer address IIAAD This is address data for specifying each storage area of the pressed key flag buffer address 83b and the chord detection buffer register 83c.

Current table address CTAD Key press flag table 83f and chord table 83g
This address CTAD value repeatedly specifies eight storage areas in a predetermined order.

Priority chord flag PCOF This is a flag indicating whether or not a chord is determined preferentially according to predetermined conditions when determining one chord from a plurality of chords stored in the chord detection buffer register 83c. ” indicates that it has already been decided, °”
0゛ indicates that it has not been determined yet.

From the plurality of chords stored in the primary cadence chord flag PCCF chord detection buffer register 83c,
The primary chord fork is a flag to ensure that cadence chords are selected alternately as much as possible, and 11" indicates that a cadence chord was previously selected, and '°0" indicates that a primary chord was previously selected. represents something.

Key pressed chord data DI'C) ID The chord currently specified by the keyboard 10, which usually consists of a root note ROOT and a type TYPE.

In order to determine the first tension level sum value SUMTENLI, the sum of the past eight chord tension levels CTENL in the chord table 83g for one key is represented.

In order to determine the second tension level sum value SUMTENL2 key, a chord table 83g for another key.
represents the total value of the past eight chord tension levels CTENL.

It represents a temporary key determined according to predetermined conditions before the MKD key is finally determined in sheet steel data.The most significant bit MSB represents the major/minor character, and the lower bit represents the music using the key code KC. Represents the target key (C key, G key, etc.).

Key data MKD Indicates the final key, most significant bit MSI
I represents the length and shortness, and the lower bit is the key code) I
c represents a musical key (C key, G key, etc.).

Key setting flag MKSF This flag indicates whether the key has been set or not. 0°° indicates before the key is set, and °1'° indicates after the key has been set.

Mode data 5CALE Indicates the determined musical mode such as Ionian or Torian.

Rhythm type data RHY Indicates rhythm types such as group, march, waltz, etc.

Rhythm run flag RUN This is a flag that indicates the operating state or stopped state of the automatic rhythm performance. "1" indicates the operating state, and "0" indicates the stopped state.

Tempo count data TCNT Count data representing the progress state of the autorhythm, which repeatedly changes from "o" to "31" corresponding to one bar or two bars.

Furthermore, various detection tables 91, rhythm pattern memory 92, and accompaniment pattern memory 93 are connected to bus 50. The various detection tables 91 are composed of r(OM) and include a chord constituent note table 91a, a chord tension table 91b, a primary/cadence chord table 91C, a first modal table 91d, and a second modal table 91e.

The chord constituent note table 91a is as shown in FIG. 3A.
m7th+m7tbhi5), 7th, Maj, 5O54
For chords detected by the electronic musical instrument such as
Basic chord constituent tones (e.g., lo, 3°, 5°, 7° for m7th) and tension notes (e.g., 9 for 117th) as shown in Figures and Figure 3B.
and 11° tones), and also stores the tension tone number TNO (in parentheses in the table of FIG. 3A) for the tension tone. Furthermore, here,
The notation of chords used in this embodiment will be explained briefly. However, the numbers in parentheses [1] are for the case where the root note ROOT is C note.

Major...Maj [CMaJ] Minor...
Min [CMllll] Seventh...7th [
C7thl minor seventh... m7th [C, 7th
]Mina Seventh Flat 5...a+7th("5)
[0,7□(shi5)] Susbenzoite 4-...5IJS4 [C5us4
] Seventh Suspension Date 4...7th (SUS4
) [C7th (SUS4)] Augment...Aug [CAUG Cody Miniature...Dim [CDIM] As shown in FIG. 3C, the chord tension table 91b contains chord data ( (in parentheses in the figure) are classified and stored into groups 1 to 7, and a chord tension level CTENL is stored for each chord.

However, in Figure 3C, the chord base (
For example, IMa4. n [17th, etc.) and the chord group name of each group (for example, primary chord, related ■
(obsolete dominant, etc.) is indicated.

As shown in FIG. 3D, the primary/cadence chord table 91c stores primary chord groups and cadence chord groups expressed in degrees for each group.

Note that this frequency display corresponds to a chord base based on the key of C; for example, I m7th corresponds to C+a7th.

The first modal table 91d, as shown in Fig. 3E, is a table for determining modes such as Ionian and Torian (see Fig. 3G) in the tuning diameter, and is for each chord base in degree display or the chord group. It stores data representing the names of various modes. As shown in FIG. 3F, the second mode table 91e is a table for determining modes such as Aionian and Torian before determining the key, and contains data representing various mode names for each chord type such as Maj and Min. I remember.

The rhythm pattern memory 92, as shown in FIG. 4A,
Each rhythm type is divided into multiple pattern memories, and each pattern memory stores tempo count data TCNT (
It has 32 addresses specified by θ~31),
At each address, percussion instrument sound data PITD representing percussion instruments such as cymbals, bass drums, etc. to be generated are stored as many as the number to be generated. Furthermore, data NOP indicating no processing is stored at an address that is not the timing for producing a percussion instrument sound.

As shown in FIG. 4B, the accompaniment pattern memory 93 includes a plurality of series of accompaniment pattern memories 93-1, 93-2 each corresponding to a plurality of accompaniment tones such as albejo notes and bass notes.
...93-n is provided. Each accompaniment pattern memory 9
3-1.93-2...93-n are divided into multiple pattern memories for each rhythm type and mode, and each pattern memory stores tempo count data TCNT (
It has 32 addresses designated by 0 to 31).

In each address, key-on data KON representing the start of sound generation of each accompaniment sound, pitch data PINT for determining the pitch of each accompaniment sound, and key-off data KOF representing the end of sound generation (key-off) of each accompaniment sound are stored. There is. In such a case, the pitch data PINT is based on the fundamental tone of each mode (root note R
OOT ) is expressed as a semitone interval difference. Furthermore, data NOP indicating no processing is stored at addresses that are not the generation timing of each accompaniment sound.

Next, the operation of the electronic musical instrument configured as described above will be explained according to FIGS. 5 to 12. Before explaining the operation in detail, the overall operation of this electronic musical instrument will be briefly explained. .

- = H This electronic musical instrument ultimately determines the mode from the chord specified by the key pressed, the determined key, and the rhythm type, and selects the accompaniment tone as appropriate as possible according to the determined mode and the key pressed chord. The accompaniment tone is automatically generated according to the rhythm.

Therefore, it is necessary to determine the pressed key chord as accurately and quickly as possible, and the same chord is detected by different methods before and after determining the key. That is, before determining the key, the chord is determined to be the most probable one without using information regarding the key, and the tuning diameter is determined according to the determined play. The key may be manually specified by the performer, or the most likely key may be automatically determined according to the flow of the detected chords. In principle, a mode is determined according to the chord and key, and at the same time, accompaniment pattern data corresponding to the mode and rhythm is output, and accompaniment tones corresponding to the pattern data and chord are obtained. Furthermore, before determining the key, accompaniment pattern data corresponding to the detected chord and rhythm type is generated, and accompaniment tones corresponding to the pattern data and chord are obtained.

Hereinafter, detailed operations of the embodiment will be explained in detail for each program and each routine.

Main Program The main program is as shown in the flowchart of FIG.
Various variable data in the working memory 83 are initialized. After the initial settings, the CPU 82 performs step 1.
The cyclic process consisting of 02 to 129 continues to be executed.

In step 102, it is determined whether or not there is a key press event associated with a key press operation on the keyboard 1o. If there is no key press operation, rNOJ is determined in step 102, and the program proceeds to step 118. If there is a key press operation, rYESJ is determined in the same step 102, and the key press buffer register 8 is determined in the Stella 1103.
All data in 3a is cleared, and all key codes KC related to keys pressed at the same time in step 104
is taken into the key press buffer register 83a from the key switch circuit 10a via the bus 50.

After the processing in step 104, it is determined in step 105 whether the key setting selection switch 21a is on the auto side. If the key setting selection switch 21a is now on the auto side due to the operation of the key setting selection operator 21, step 1
At step 05, it is determined that rYE S J, and at step 106, a chord determination routine is executed. The details of this chord determination routine will be described later, but in this routine
The chord specified to be pressed at 0 is detected. Next, in step 107, the performance start flag PSTF is set to 0°.

It is determined whether or not. If the performance start flag PSTF is °°0゛° and the performance has just started, step 1
Based on the determination rYES in step 07, step 10
At step 8, the type of the current chord determined by the processing of the chord judgment routine and represented by the pressed key chord data DPCHD is judged, and based on the judgment that if the current chord is the Min chord fork or the m7th chord, rYES. At step 109, the performance start minor flag PSTMF is set to "1". Also, if the current chord is not a Min chord or a moth chord,
The performance start minor flag PSTMF remains at 0 based on the NOJ determination in the aforementioned determination. After the processing of steps 108 and 109, the performance start flag PSTF is set to 1'' in step 110, indicating that it is not the time to start the performance, and the program proceeds to step 111. If the flag PSTF is set to "1" indicating that the performance has started, the program directly advances to step 111 based on the rNo determination at step 107.

The details of the key determination routine in step 111 will be described later, but in this routine, the key is automatically determined based on the detected chord. Note that steps 107 to
110 is one of the conditions for detecting a minor key.
The chord at the beginning of the song is the Min chord or the m7th chord.
It is used for judgment.

On the other hand, if the preparation room selection switch 21a is on the manual side due to the operation of the preparation room selection operator 21, then step 10
In step 5, it is determined that rNOJ, and in steps 112 and 113, it is determined whether the major key switch 22a or the minor key switch 23a is in the on state. This major key switch 22a
Or, determining whether the minor key switch 23a is on is to determine whether the key pressed on the keyboard 10 is for a tuning room or for specifying a chord, and the major key operator 2
When the major key switch 22a is in the on state due to the operation of step 2,
Based on the determination of rYEsJ in step 112, in step 114 the most significant bit MSB of the key data MK
is set to 1" representing a major key, and at the same time the same data MK
The lower bit of D is set to C as the key code related to the highest key pressed on the keyboard 10 and in the pressed key buffer register 83a. Further, when the minor key switch 23a is in the on state due to the operation of the minor key operator 23, the determination of rNo in step 112 and step 113
Based on the determination "rYES" in step 115, the most significant bit MSB of the key data MKD represents the minor key.
At the same time, the lower bit of the data MKD is set to 0'°, and the lower bit of the same data MKD is the key code K related to the highest key pressed on the keyboard 10 and in the pressed key buffer register 83a.
It is set to C.

After processing steps 114 and 115, step 11
At step 6, the preparation room flag MKSF is set to '°1', and the program proceeds to step 118.

In this way, if the adjustment room selection operator 21 is set to the manual side, the key data MKD is changed to the key press on the keyboard 10 and the major key operation on the adjustment room operation panel section 20 by the processing in steps 112 to 116. key 22 (or minor key operator 2
It is set according to the operation in 3).

On the other hand, if neither the major key switch 22a nor the minor key switch 23a is in the on state, steps 112 and 11
Based on the determination of rNOJ in both of step 3, step 1
At step 17, a chord determination routine similar to step 106 is executed, and the program returns to step 111.
The program then proceeds to the key determination routine.

In step 118, it is determined whether there is an on event of the rhythm selection switch. If you want to operate any of the operators in the rhythm selection operator group 31,
At step 118, it is determined "NO", that is, there is no on event regarding the rhythm selection switch, and the program proceeds to step 124. Further, if any operator in the rhythm selection operator group 31 is operated, it is determined in step 118 that rYES, that is, there is an on event related to the rhythm selection switch, and the program proceeds to determination processing in steps 119 and 120. You can proceed. In step 119, the rhythm type data RII 't
It is determined whether the previously selected rhythm type represented by RHY is blues and the newly selected rhythm type is something other than blues. It is determined whether the previously selected rhythm type is other than blues and the newly selected rhythm type is blues. Now, if the selected rhythm type has been changed from blues to something other than blues, based on the determination rYES in step 119, the pressed key flag table 83f and chord table 83g are changed in step 121.
After all the data in the rhythm is cleared, in step 123, the rhythm type data RHY is set to new data representing something other than the blues. Also, if the selected rhythm type is changed from something other than blues to blues,
Based on the determination of rNOJ in step 119 and the determination of rYES in step 120, step 1
After all data in the blues table 83h is cleared in step 22, rhythm type data RHY is cleared in step 123.
is set to new data representing the blues. on the other hand,
If both of the above judgment conditions are not met, both steps 119,
Based on the determination of rNOJ in step 120, the program proceeds directly to step 123, where the rhythm type data RII Y is set to new data representing the selected rhythm type. .

In step 124, it is determined whether there is an on event of the start/stop switch.

In such a case, if the start/stop operator 32 is desired to be operated, it is determined in step 124 that there is no on event related to the start/stop switch, and the program proceeds to step 128. Further, if the start/stop operator 32 is operated, rYES is determined in step 124, that is, it is determined that there is an on event regarding the start/stop switch,
At step 125, the rhythm run flag R11N is inverted (
＜”o’: to °“1°° or °゛1” to °°0°
) and the tempo count data TCNT
is initialized to "0".Next, in step 126, the new Zumran flag RU is inverted by the above process.
It is determined whether N is ′°1”. In such a case,
If the rhythm had previously stopped and is to start anew this time, the rhythm run flag RUN is nl'', and based on the determination of ``rYES'' in step 126, the performance start flag PSTF and the performance start are set in step 127. Both minor flags PSTMF are initialized to "O". Also, if the rhythm was working before and now stops,
The rhythm run flag RUN is °°0” and step 1
Based on the rNOJ determination at 26, the program proceeds directly to step 128.

Step 128 shows a mode determination routine, and a detailed explanation of this routine will be given later, but in this routine, the mode being played is determined according to the chord, key, etc., and data representing the determined mode is stored in modal data 5CAIL. ! is set as After processing step 128, step 129
In this step, operation event processing regarding the rhythm control operation panel unit 30 and other operators 33, 34, 41, 42, etc. in the other operation panel unit 40 is executed, and the tempo of the autorhythm, the tone color and volume of the generated musical tone signal are executed. etc. are set and controlled.

Next, the chord determination routine, key determination routine, and mode determination routine executed in the main program will be explained in detail.

The details of the sum-"'1c' rune chord determination routine are as shown in the flowchart of FIG. 6, and step 106 of the main program.
It is read out in step 117 and its execution starts from step 200.

After this start, in step 201, the pressed key flag buffer register 83b and the chord detection buffer register 8
All data in 3c is cleared, and buffer address BAAD and root count data RCNT are reset. As a result, the buffer address BAAD comes to indicate the start address of the pressed key flag buffer register 83b and the chord detection buffer register 83c, and at the same time, the root note count data RCNT (see Figure 2D) is changed to the key of the C note as the reference note. The code will now be shown as KC.

Next, in step 202, the key press buffer register 83a
Based on the key code KG stored in the key code KG, 1'' is set only in each bit position corresponding to the key press sound in the rotation register 83d (see FIG. 2D). For example,
If the key pressed sound is a G note, an E note, a G note, or a B note, Pa1" is set only in the 1.3°5.7 position of the same register 83d, and 0" is set in the remaining positions. be done. Step 2
After the processing in step 02, a chord detection buffer data formation routine is executed in step 203.

This chord detection buffer data formation routine is shown in detail in FIG.
At the same time, the root note count data RCNT is incremented by "1" at each rotation. Note that if the most significant bit MSB is "1" only at the beginning, the program proceeds to step 302 without performing the rotation, and from the next time on, even if the most significant bit MSB is "1", the rotation will not be performed. After this is done, the program proceeds to step 302. After the processing of step 301,
At step 302, the root note count data RCNT is set to “1”.
1" is determined. In this judgment, the root note count data RC has a small number of rotations.
If NT is "11" or less, the program proceeds to step 31 based on the determination that it is rNOJ in step 302.
The program proceeds to a chord search routine consisting of 0 to 315.

In this chord search routine, the rotation register 83 (the most significant bit MSB of l is
A plurality of chords that may be specified are detected depending on whether a ° note, a 5 degree note, a 7 degree note, etc. are present. Below, nine types of chords that can be detected in this embodiment and their detection methods are shown.

0m7th chord This is detected on the condition that the 7° note and the 3rd note are present, and the 5°b note is not present, and steps 310 to 3
12 is detected, and the program proceeds to step 321.

■m7th (1) 5) This is detected on the condition that the chord 7°, 3°b, and 5th note are present.It is detected by the determination processing in steps 310 to 312, and the program advances to step 322. You can proceed.

(2) 7th chord This is detected on the condition that a 7° note and a 3° note are present, and is detected by the determination processing in steps 310 and 311, and the program proceeds to step 323.

7th (SUS4) This chord is detected on the condition that the 7th note and the 3rd note are present.This is detected by the determination processing in steps 310 and 311, and the program proceeds to step 324.

■Aug chord is detected on the condition that the 7° note does not exist, and the 3° note and the 5° # note exist, and step 310.31
It is detected by the determination process in step 3, and the program proceeds to step 325.

■ This is detected on the condition that there is no 7th note of the Dim chord, no 3° note or 5th note, and the presence of 3° G note and 5° G note, and steps 310 and 313 are performed. , 314, and the program proceeds to step 326.

■It is detected on the condition that the Min chord 7゛ note does not exist, the conditions of ■■ above do not hold, and the 3゛ note is present, and it is detected by the determination processing in steps 310, 313 to 315. The program then proceeds to step 327.

■Maj chord This is detected on the condition that the 7° note does not exist, the conditions of ■■ above do not hold, and the 3° note is present, and is detected by the determination processing in steps 310.313 to 315. , the program proceeds to step 328.

■It is detected on the condition that the 5US4 chord 7° note does not exist, the conditions of ■■ above do not hold, and the 3° Pak note is present, and is detected by the determination processing in steps 310, 313 to 315. The program then proceeds to step 329.

This chord detection causes the program to proceed from step 321 to
329, in steps 321 to 329, the root note count data RCNT, m7th, m7
Type data TYPE such as th(1)5), 7th, etc.
The root note ROOT and type TYPE of the chord are respectively written to addresses designated by the buffer address BAAD value of the chord detection buffer register 83c (see FIG. 2C). After processing each of these steps 321 to 329, in steps 331 to 339, the chord constituent note table 91a (third
A) is referred to, and the pressed key flag in the rotation register 83d is directly transferred to another 12-bit register (not shown) configured in the same manner as the rotation register 83d, and is transferred to the other register. Among the pressed key flags (“1”), notes other than the basic constituent notes and tension notes stored in the chord constituent note table 91a are deleted as miss notes, and the root note R2O3
After being rotated to the right by minutes (the number of rotations), the pressed key flag data in the other register is transferred to the address specified by the buffer address BAAD value of the pressed key flag buffer register 83b (see FIG. 2B). are written respectively. As a result, the pressed key flag from which the missed note has been removed and which has been returned to the state at the time of key depression is written to the address of the pressed key flag buffer register 83b. Next, steps 341-34
At step 9, the chord constituent note table 91a is referred to again based on the type TYPE, and the rotation register 83 is
The number of tension notes TENS is determined by the pressed key flag in d.
U and the minimum tension note number LTNO are detected, and the tension note number TENSU and the minimum tension note number LT
NO is written to each address designated by the buffer address BAAD value of the chord detection buffer register 83c. It should be noted that, of course, in the processing of steps 341 to 349, the missed note should be taken into account, but for the next chord detection process, the pressed key flag ("1") corresponding to the missed note is also stored in the rotation register 83d.
It remains inside.

After processing steps 341 to 349, step 35
1, the buffer address BAAD is incremented by "1" and the program returns to step 301 above. Then, the above steps 301, 302, 310 to 315.
Processes 321-329.331-339.341-349 are executed.

Also, in the chord search routine mentioned above, the topmost pitch) M
If a chord with SB as the root note is desired to be detected, that is, if it is determined in steps 311 and 315 that there is no chord, the buffer address BAAD is not incremented and
The program returns to step 301 and repeats steps 301, 302, and 310 to search for a new chord.
~315,321~329.331~339,341~
349 processing is executed. As a result, possible chords are sequentially written into the chord detection buffer register 83c with each depressed note as the root note, and key depression flags excluding miss notes are pressed corresponding to the chord detection buffer register 83c. The key flag is now written to the key flag buffer register 83b. In such a state,
When the number of rotations increases and the root note count data RCNT becomes 12 or more, in step 302 r
If YESJ is determined, the processing of the chord detection buffer data formation routine is terminated in step 303, and the program proceeds to step 204 of the chord determination routine in FIG.

In step 204, the key setting flag MKSF is set to
It is determined whether or not the angle is "1°". As mentioned above, this key setting flag MKSF indicates before key setting at 0'' and indicates the key setting diameter at °°1'°.If it is before key setting, rNOJ at step 204 Based on the determination, the first chord detection routine is processed in step 205. If it is the key setting diameter, the process proceeds to step 206 based on the determination that r Y E S , + in step 204. After steps 205 and 206 are processed, the execution of the chord determination routine is terminated in step 207.

Next, the first chord detection routine will be explained. The execution of the routine starts at step 400 in FIG.
At step 401, the presence or absence of chord data such as root note ROOT and type TYPE in the chord detection buffer register 83c is determined. In such a case, if there is chord data in the chord detection buffer register 83C as a result of the processing of the chord detection buffer data formation routine described above, rYESJ is determined in step 401, and step 402 is performed.
Among the chord data in the chord detection buffer register 83c, the one with the smallest number of tension notes TENSU is searched. After such a search, in step 403, it is determined whether there are a plurality of tension notes with the minimum number of tension notes TENSU. If there is a plurality of chord data searched, based on the determination rYES in step 403, the number of tension notes TEN is determined in step 4O4.
After the chord data corresponding to the minimum tension note number LTNO is searched from among the chord data with the smallest SU, in step 405, the root note R00T and type TYI'g related to the searched chord data are determined as key pressed chord data DPC.
The settings are stored as HD. In addition, the step 402
If there is one chord data searched in step 403, the program proceeds directly to step 405 based on the determination of rNo in step 403;
The root note ROOT and type TYPE of the chord data with the minimum number of tension notes TENSU are set and stored as pressed key chord data DPCIID. Through the processing of steps 402 to 405, the safest chord, that is, the chord with the lowest tension is determined without using the key data MKD.

After the processing in step 405, in step 406 it is determined whether the pressed key chord data DPCII D representing the determined chord indicates an Aug chord or a Dim chord, and the chord data I)I'C)ID indicates an Aug chord or a Dim chord, then r in step 406
Based on the determination of YESJ, the execution of the first chord detection routine is terminated in step 411.

Further, the chord data DPCHD is an Aug chord and a Di chord.
If the m chord is not indicated, the r in step 406
Based on the determination of NOJ, data is stored in the pressed key flag table 83f and chord table 83g, which are used to determine the key, in steps 407-409.

That is, in step 407, the current table address CT
The arithmetic process of adding "1" to AD (modulo 8) is performed, and in step 408, the pressed key chord data DP is stored at the address of the chord table 83g specified by the same address CTAD.
The root note ROOT and type TYPE of CHD are written, and in step 409, the key pressed key flag buffer register 83b corresponding to the pressed key chord data DPCIID is written to the address of the pressed key flag table 83f specified by the same address CTAD. The pressed key flag is stored, and the execution of the first chord detection routine is ended in step 411. If a chord is detected as a result, the chord data excluding the Aug chord or Dim chord is stored in the chord table 83g.
At the same time, the pressed key flag from which the miss note has been deleted is written to the pressed key flag table 83f. In such a case, the reason why the Aug chord and the Dim chord are excluded is that these chords change the chord progression of the song, and if the same chord is used for key determination, it is desired that the key determination be made accurately. Further, the addition operation in step 407 is performed on the pressed key flag table 83f and the chord table 83f.
The address of g is repeatedly specified, and at the same time, when both tables 83f and 83g are addressed in the initial state, the first (0) address is specified.
In the initial setting, the current table address CTAD is set to the final address value of both the tables 83f and 83g.

On the other hand, if it is determined in step 401 that there is no chord data in rNOJ, that is, in the chord detection buffer register 83c, then in step 410 the pressed key chord data DPCIID is set to data indicating that the chord is not established. , the execution of the first chord detection routine is completed in step 411. As a result, even if the chord does not hold, as in the case where the detected chord is an Aug chord or a Dim chord,
The address CTAD is not updated, and the address εTAD is kept in its previous state.

By executing the first chord detection routine consisting of steps 400 to 411, the first chord detection routine is executed every time a key is pressed on the keyboard 10 before the tuning method, and therefore, except for the initial state, the pressed key flag table is The chord table 83f and the chord table 83g store eight past chord data used for key determination.

Next, a description will be given of the second chord detection routine that is executed when the key setting contact, that is, rYES is determined in step 204 (FIG. 6). Execution of this routine begins at step 500 of FIG. 9A and begins at step 501.
The root note R in the chord detection buffer register 83c is
The presence or absence of chord data such as OOT and type TY1'E is determined. In such a case, if no chord data is stored in the chord detection buffer register 83c by the process of the chord detection buffer data formation routine (FIG. 7) described above, it is determined that the chord data is rNOJ in the step 501, and the first Similar to the chord detection routine (Figure 8), step 5
At 02, the chord failure data is key press chord data DPCHD.
, and the execution of the second chord detection routine is ended in step 503.

Further, if there is chord data in the chord detection buffer register 83c at the time of determination in step 501, the determination in step 501 is ``YES'', and step 504
In step 505, the priority chord flag PCDF is initialized to '0'', and in step 505, a chord that meets the following priority condition 1 is stored in the chord detection buffer for the previous chord, that is, the chord represented by the pressed key chord data DPCHD. It is determined whether it exists in the register 83c.

(Kupi) Gagoshi - 1 - The chord type TYPE changes from 7th or 7th (SUS4) to Maj, and the chord root ROOT descends by one or seven semitones, that is, the chord transition Must match the terminal type.

If a chord matching the priority condition 1 exists in the chord detection buffer register 83c, r in step 5.
Based on the determination YESJ, in step 506, the root note ROOT and tie 7'' TYPE regarding the chord data in the chord detection buffer register 83c that match the priority condition 1 are determined.
is set and stored as the pressed key chord data I)I'CHD, and "1" is added to the current table address CTAD in step 507 in the same way as steps 407 to 409 (first chord detection routine) described above ( Modulo 8)
Arithmetic processing is performed, and in step 508 the same address CT
The address of the chord table 83g specified by AD is the root note ROOT of the pressed key chord data DPCHD, and the type TYPE.
and the chord tension level CTENL are written, and in step 509, the key pressed key flag buffer register 83b corresponding to the pressed key chord data DPCII D is written to the address of the pressed key flag table 83f specified by the same address CTAD. A pressed key flag is stored.

In addition, in the process of step 508, since the key has already been set, the pressed key chord data OPCII D
Subtract the key data MKD from the root note ROOT (modulo 1
2), chord data in degree display, that is, chord data based on the key of C, is derived together with the type TYPE of pressed key chord data l) l'c[l, and the chord tension table 91b ( By referring to FIG. 3C), the chord tension level CTENL stored in the table 91b is read out, and the level CTENL is written into the chord table 83g. As a result, chords based on the musical ending theory are determined preferentially. After the processing in step 509,
At step 510, the priority chord flag PCDF is set to '°1°.
° and the program proceeds to step 511.

On the other hand, if the determination in step 505 is "No," that is, if it is determined that there is no chord matching the priority condition 1 in the chord detection buffer register 83c, the program proceeds directly from step 505 to step 511. In this case, the priority chord flag PCDF remains set to 0.

In step 511, a chord that meets the following priority condition 2 or priority condition 3 is extracted from the chord detection buffer register 83c for the previous chord, that is, the chord represented by the pressed key chord data DPCHD.

1st wash ffi The chord has moved from the second chord group to the third or fourth chord group shown in the chord tension table 91b (FIG. 3C).

l circle moxibustion 11 The chord has moved from the 5th chord group to the 6th or 7th chord group shown in the chord tension table 91b (Figure 3C).

In addition, in this extraction, as in the case described above, the pressed key chord data DPCHD and the chord detection buffer register 83 are used.
Based on the chord data and key data MKD in c, the chord tension table 91b is referred to, and the extracted data is temporarily stored.

Next, in step 512, it is determined whether the extracted data exists. In such a case, if the extracted data exists, based on the determination of "YES" in step 512, step 5 is executed.
After processing steps 13 to 520, the program proceeds to step 521 (
9B). If there is no extracted data, the program proceeds directly to step 521 based on the rNo determination in step 512.

In step 513, the extracted chord data and the previous chord, that is, the chord indicated by the pressed key chord data DPCIID, are included in the extracted chord data.
A determination is made as to whether or not there is a match.

In such a case, the root note ROOT of the pressed key chord data DPCHD
Subtract the root note ROOT of the extracted chord data from (modulo 1
2) It is determined whether the subtraction result is "5" or not. Now, if there is any chord data that matches the priority condition 4 in the extracted chord data, rYES is selected in step 513.
, and in step 514, the root note R00T and type TYPE of the chord data matching the priority condition 4 are set as the key pressed chord data DPCHD. Further, if there is no chord that matches the priority condition 4 in the extracted chord data, it is determined as rNOJ in step 513,
In step 515, any one of the extracted chord data is selected according to a predetermined condition (for example, the first one extracted), and the root note ROOT and type TYPE of the selected chord data are set as key pressed chord data DPCHD. be done.

After processing steps 514 and 515, step 51
At step 6, it is determined whether the priority chord flag PCOF is "1". In this determination, if the determination is YES, that is, the priority chord flag PCDF has already been set to "Pa 1" by the processing in step 510, step 51 is performed in the same manner as in steps 508 and 509 described above.
At step 7, the root note ROOT, type TYPE, and chord tension level CTENL of the set key pressed chord data DPCIID are written to the address of the chord table 83g specified by the current table address CTAD, and at step 518, the root note ROOT, type TYPE, and chord tension level CTENL are written to the address of the chord table 83g specified by the current table address CTAD. The pressed key chord data D is stored at the specified address of the pressed key flag table 83f.
Press key flag buffer register 8 compatible with PCHD
The pressed key flag in 3b is stored. In this case, since the current table address CTAD is desired to be incremented, each data written in the chord table 83g and the pressed key flag table 83f is rewritten by the processing in steps 508 and 509. If it is determined in step 516 that the chord is rNOJ, that is, the processes in steps 506 to 510 have not been performed, the priority chord flag PCDF is set to "1'°" in step 519, and in step 520, the above-mentioned After the current table address CTAD is incremented in the same manner as in step 507, step 517.
8 processing is performed. As a result, in such a case, the root note ROO corresponding to the pressed key chord data DPCOD is stored at an address in the chord table 83g and pressed key flag table 83f that is incremented by "1" from the storage address of the previous various data.
T, type TYPE, chord tension level CTENL
and the pressed key flag are written. Through the processing of steps 511 to 518, chords appropriate for the musical chord progression are preferentially determined.

After the processing in step 518, the program proceeds to step 521 in FIG. 9B, where it is determined whether the decisive key is a minor key. In such a case, if the decisive key is a minor key, it is determined in step 521 that rYES, that is, the key data MKD indicates a minor key, and after the minor key priority routine consisting of steps 522 to 534 is executed, the program proceeds to step Proceed to 535. If the decisive key is a major key, the program proceeds directly to step 535 based on the rNo determination made in step 521.

To explain this minor key priority routine, after the determination in step 521, it is determined in step 522 whether or not the briny cadence chord flag PCCF is "0°°".In such a case, if a cadence chord was previously selected If the same flag PCCF is "1°" in the state, it is determined as rYEsJ in step 522, and steps 523 and 524 respectively check whether there is a primary chord in the chord detection buffer register 83c or a cadence chord. It is determined whether there is. Note that this determination is based on the root note ROQT of each chord data in the chord detection buffer register 83c.
This is done by referring to the primary/cadence chord table 91c based on the chord data expressed in degrees by subtracting the key data MKD from (modulo 12) and the type TYPE of each phase tone data. If there is a primary chord in the chord detection buffer register 83c now, step 5
At step 23, it is determined as rYESJ, and at step 525, the primary cadence chord flag PCCF is set to II OII representing the primary chord, and at step 526.
The root note ROOT and type TYPE of the chord data that meet the above conditions are set as the pressed key chord data DPCIID. In addition, the chord detection buffer register 83
If there is no primary chord in c and there is a cadence chord, it is determined to be rNOJ in step 523, rYESJ is determined in step 524, and step 52
At step 7, the primary cadence chord flag PCCF is reset to "1" representing a cadence chord, and the process of step 526 is executed. ``Furthermore, if there is no primary chord or cadence chord in the chord detection buffer register 83c, in steps 523 and 524, r
The determination is No, and the program proceeds to step 535.

On the other hand, if the primary chord has been previously selected and the flag PCCF is '0', step 52
2, it is determined to be rNOJ, and steps 528 and 529
In each step, it is determined whether there is a cadence chord or a primary chord in the chord detection buffer register 83c in the reverse order from the above case. Note that this determination is also performed in the same manner as in steps 523 and 524 described above. If there is a cadence chord in the chord detection buffer register 83c, rYES is determined in step 528, the primary cadence chord flag PCCF is set to "1" representing a cadence chord in step 527, and the step In 526, the root note ROOT and type TYPE of the chord data that match the above conditions are key pressed chord data DP.
Set as CHD. Further, if there is no cadence chord in the chord detection buffer register 83c and there is a primary chord, a determination of "NO" is made in step 528, rYESJ is determined in step 529, and a primary cadence chord flag is determined in step 525. PCCF
does not represent a primary chord and is reset to II O11, and the process of step 526 is executed. Furthermore, if there is no primary chord or cadence chord in the phase detection buffer register 83c, rNO is determined at steps 528 and 529, respectively, and the program proceeds to step 535.

After the process of step 526, steps 530 to 518 are performed in the same way as the process of steps 516 to 518 in FIG. 9A.
By processing 532, the priority chord flag PC is set in the previous processing.
If DF is already set to "1°", the root note ROOT, type TYPE, and chord tension level corresponding to the latest pressed chord data DPCHD already written in the chord table 83g and pressed key flag table 83f. The CTENL and pressed key flags are each rewritten. Also, if the priority chord flag PCDF was not set to ``1'' in the previous process, the priority chord flag PCDF is
After F is newly set to "1°" and the current table address CTAD is incremented, the chord table 83g is incremented by "1" from the previous storage address of various data.
The root note ROOT, the type TYPE, and the pressed key flag corresponding to the pressed key chord data DPC) ID are newly written to each address of the pressed key flag table 83f.

Through the processing of steps 522 to 534, primary chords and cadence chords are selected alternately as much as possible, and chords appropriate for musical chord progression in a minor key are determined preferentially.

After the processing of steps 521, 524, 529, and 532, it is determined in step 535 whether or not the priority chord flag 1'CDF is pa 1°'. In this case, if the chord has already been selected as a priority and the flag PCDF is "P1", rYES is selected in step 535.

It is determined that this is the case, and the program proceeds directly to step 542, where the execution of the second chord detection routine is terminated. Further, if a chord has not yet been prioritized and the priority chord flag PCDF is "0", the determination in step 535 is "NO", and step 536
A chord tension level CTENL is written for each chord in the chord detection buffer register 83c.

When writing the overcast chord tension level CTENL, from the root note ROOT of each chord data to the key data M
The pitch indicated by KD is subtracted (modulo 12), and the root note R of the chord data expressed in degrees is expressed by the subtraction result.
OOT and key pressed chord data DPCHD type TYPE
Based on this, by referring to the chord tension table 91b, the chord tension level CTENL is read from the table 91b, and the chord tension level CTENL is added to the chord data in the chord detection buffer register 83c. However, regarding the Aug chord and the Dim chord, the chord tension level CTENL is not stored in the chord tension table 91b either, and the same level CTENL is not written into the chord detection buffer register 83c for the two phases before step 537. After the processing, in step 537, it is determined whether chord data matching the following chord tension transition conditions exists in the chord detection buffer register 83c.

"-tion '- When the chord tension level CTENL increases, it gradually changes (for example, 0 or more and less than +3), and the same level C
When TENL falls, it changes rapidly (for example, less than -3) so that the chord tension level CTENL changes in a sawtooth waveform.

Note that in this determination process, similarly to step 536, the immediately preceding chord, that is, the pressed key chord data 'D P C
Based on the root note ROOT, type TYPE, and key data MKD of the chord represented by II O, the chord tension level CTENL* of the immediately preceding chord is derived by referring to the chord tension table 91b, and the derived level CTENLI and the above-mentioned chord tension level CTENL* are derived. Chord tension level CTENL for each chord stored in the chord detection buffer register 83C
and O<CTENL-CTENL*
Find a chord with a chord tension level CTE N l that matches <+3 or CTENL-CTENL*<-3.

In such a case, if a chord matching the chord tension transition condition is found, as soon as it is found, rYES is determined in step 537, and steps 526, 534,
Steps 538 to 541 similar to the processing of 531.532
By the process, the root note R of the chord data that meets the above conditions is
OOT and type TYPE are key pressed chord data DPC) 1
0 and the current table address CT
AD is incremented, and from the previous storage address of various data, "
The pressed key chord data [1PC
The root note ROOT, type TYPE, chord tension level CTENL, and pressed key flag corresponding to HD are written.

After the processing in step 541, the execution of the second chord detection routine is terminated in step 542. Through the processing of steps 536 to 541, an appropriate chord is determined along the chord tension level line representing the chord progression.

On the other hand, if there is no chord data that matches the chord tension transition condition in the chord detection buffer register 83c, a determination of "NO" is made in step 537, and the program proceeds to step 543 in FIG. 9C. A chord is determined through the processes 543 to 551. The processing of these steps 543 to 551 is performed in step 549 when the chord tension level CTENL is set in the chord table 83.
The processing is the same as that of the first chord detection routine of FIG. 8 except for the step 531 in FIG. 9B. As a result, the chord detection buffer register 8
From the chord data stored in 3c, the chord tension note number TENStl and the lowest tension note number LT
The chord with the smaller NO is determined as the designated chord.

Next, the state determination routine will be explained. Execution of this state determination routine starts from step 600 in FIG. 10A, and if in step 601 the current chord, that is, the pressed key chord data DPCHD indicates that the chord is not established, and the Aug chord fork indicates a Dim chord, then in step 601 rYESJ It is determined that, in step 602, the execution of the state determination routine is terminated. As a result, in such a case, it is desirable to substantially perform the state determination process.

Also, if the current chord is not a chord, an Aug chord or a Dim chord,
If no chord is indicated, it is determined in step 603 whether the selected rhythm is blues based on the rhythm type data RHY. This is because the conditions for this determination differ significantly depending on whether the selected rhythm is blues or something other than blues in the tuning method.

First, to explain the case where the selected rhythm is other than blues, it is determined in step 603 that it is rNOJ,
The program advances to steps 604 and 605, a major key determination motivation routine. In step 604, it is determined whether the current chord has descended by one or seven semitones in terms of the root note ROOT from the previous chord. In this determination, the root note ROOT of the chord data stored at the address immediately before the current table address CTAD in the chord table 83g is compared with the root note ROOT of the pressed key chord data DPCHD. If the sound changes from G to G or from D to G, the determination in step 604 is rYESJ, and the program proceeds to step 605. In this step 605, the relationship from the previous chord to the current chord is
Regarding type TYPE, transition from Maj chord to Maj chord, transition from 7th chord to Maj chord, or 7th (
SUS4) It is determined whether the chord has shifted to the Maj chord. In this judgment as well, the type TYPE of the chord data stored in the address immediately before the current table address CTA [l in the chord table 83g and the type TYPE of the pressed key chord data [lI'C)It) are compared. For example, if the chord transitions from G MaJ to CMaJ or from G7tb to CMaJ, the determination in step 605 is rYES, and step 60
At 6, the most significant pitch (MSB) of D is set in the sheet steel data KM to °゛1'', which indicates a major key.

On the other hand, if the root note ROOT and type TYPE do not have the relationship specified in steps 604 and 605, rNo is determined in either step 604 or 605, and the program proceeds from steps 607 to 609. The program then proceeds to the minor key determination motivation routine. Step 607
In , it is determined whether or not the performance start minor flag I'STMF, which indicates "whether the chord at the start of the performance was a Min chord or an n7 th chord," which is one of the conditions for determining a minor key, is °"1°". In such a case, if the performance start minor flag PSTMF is "0", it is assumed that the minor key determination condition is not met, and rNOJ is set in step 607.
It is determined that the key determination routine ends in step 611. In addition, the performance start minor flag PSTMF
is “1”, “YE” in step 607
Based on the determination of SJ, it is determined in step 608 whether or not the current chord has descended from the previous chord by seven semitones in terms of the root note ROOT. In this judgment as well, the root note RO of the chord data stored at the address immediately before the current table address CTAD in the chord table 83g is
OT and the root note ROOT of the pressed key chord data DPCHD are compared, and if the root note ROOT changes from G note to G note, for example, it is determined as rYES in step 608,
The program continues to step 609. In step 609, it is determined whether the relationship from the previous chord to the current chord has shifted from the Maj chord to the Min chord or from the 7th chord to the Min chord with respect to the type TYPE. In this judgment as well, the chord table 83
The type TYPE of the chord data stored at the address immediately before the current table address CTAD in g is compared with the type TYPE of the pressed key chord data DPCHD.
For example, the chord moves from GM, J to CMIn, or G7
When transitioning from th to CMIn, step 6
At step 09, the determination is rYES, and at step 610, the most significant bit MSII of the plate steel data KMKD is set to 0°'' indicating a minor key.

On the other hand, if the root note ROOT and the type TYPE do not have the relationship specified in steps 608 and 609, rNo is determined in either step 608 or 609, and the program proceeds to step 611. , the key determination routine is ended at step 611.

When the program advances to steps 606 and 610 through the processing of steps 604, 605, and 607 to 609, the pressed key chord data D P CII D
5 from the key corresponding to the root note ROOT or the same root note ROOT
Higher key (for example, if the root note ROOT is G, then C
It is expected that the image quality (G tone or G tone) will be determined, and the determination process consisting of steps 612 to 619 is further continued in order to determine one of the image tones. In step 612, each chord in the chord table 83g is converted into key pressed chord data DPCH.
Frequency display using the root note ROOT of D as the standard tone (root note ROOT of the chord in the chord table 83g - pressed key chord data DP
The chord tension table is referred to based on the converted chord to derive the chord tension levels CTENL for the past eight chords, and the sum of the chord tension levels CTENL for the eight chords is calculated as follows. It is calculated as one tension level sum value SUMTENLI.

Next, in step 613, in the same manner as in step 612, the chord tension of the past eight chords in the chord table 83g is set to a key 5 degrees higher than the root note ROOT (ROOT+7>) of the pressed key chord data DPCHD. level CT
The sum of ENL is the second tension level sum value SUMTE
Calculated as NL2.

After processing steps 612 and 613, step 61
4, the first and second tension level sum value St1
MTENL1. The magnitude relationship of SUMTENL2 is compared. Now, the first tension level sum value SUMTENLI
is smaller than the second tension level sum value SUMTENL2, the temporary key is pressed key chord data D P CII D
represented by the root R00T (for example, the root RO
If OT is the note of G, it is determined that the note is in the key of C), and in step 615, the root note ROOT is stored in the lower bit of the sheet steel data KMKD. Conversely, if the second tension level summation value SUMTENL2 is smaller than the first tension level summation value SIJMTENLI, the temporary key is the depressed key chord D 9 DPCIID NoROOT+7, which is a fifth higher than the root note ROOT (for example, If the root note ROOT is a G note, it is determined that it is in the tone of G), and in step 616, the value ROOT+7 is set in the lower bit of the sheet steel data KMKD.
is memorized.

Furthermore, both the sum values SUMTENLI, SUMTEN
If L2 are equal, the determination in step 614 causes the program to proceed to steps 617-619.

In the processing of steps 617 to 619, the root note ROOT is included in the pressed key names of the past 8 chord keys pressed.
V degree (for example, if the root note ROOT is G note, F
It is determined whether there is a sound) or whether there is a *1 change sound for the same root sound ROOT (for example, if the root sound ROOT is a C sound, it is an F doo sound). That is, in step 617, the pressed key flag table 83f is created based on the value ROOT+5 obtained by adding "5" to the root note ROOT of the pressed key chord data DI'C)ID.
is referred to, and in steps 618 and 619, the pressed key flag table 83f is referred to based on the value ROOT+6 obtained by adding "6" to the root note ROOT of the pressed key chord data l)I'C11I). Now, if the above-mentioned irregular sound (■) exists in the pressed key flag table 83f, and does not exist in the above-mentioned (1) once forehearth same table 83f, in step 617, r
YESJ and rNOJ in step 618 (
The temporary key is determined to be the one represented by the root note ROOT of the pressed key chord data DPCHD), and the step 61
5 is performed. Furthermore, if the ■M-degree sound change key press key flag table 83f exists, and the ■■ change sound does not exist in the same table 83f, it is determined that rNOJ is determined in step 617 and YES in step 619 ( It is determined that the temporary key is represented by the root note ROOT+7 of the pressed key chord data DPCHD), and the step 6
16 processes are performed. Furthermore, if both the ■ sound and the *stirring sound are present or absent in the pressed key flag table 83f, rYES is determined in steps 617 and 618, respectively, or r is determined in steps 617 and 619, respectively.
When the determination is NOJ, the processing of the state determination routine is terminated in step 611.

In this way, if the selected rhythm is other than blues, the temporary key is determined by the processing in steps 604 to 619, and the plate steel data KMK[l is set by the processing in steps 606, 610, 615, and 616. , the program proceeds to step 628 of Figure 10B.

On the other hand, if the selected rhythm is blues, rYESJ is determined in step 603, and the program proceeds to step 620 in FIG. 10B. Step 62
0, all data in the blues table 83h (Fig. 2G) is cleared, and in step 621, a chord of type 7th is extracted from the past 8 chord data in the chord table 83g (Fig. 2F). At the same time, each storage location (ROOT, I 7th), (
ROOT+7. IV7th), (ROOT+5.V 7
th> chord flags DFLG are each set to °1''. This is I whose key is the root note ROOT.
This is because the 7th chord can also be thought of as an IV7t chord whose key is the ROOT+7 note, and a V 7th chord whose key is the ROOT+5 note. Next, in step 622, from among the past eight chord data in the chord table 83g (FIG. 2F), chords of type m7 th are extracted, and each root note RooT of each extracted chord is extracted. , each storage location in the blue table 83h (RooT, I, 7
th>, (ROOT+7.1V-7th), (RO
OT+5. The chord flags DFLG for V -7th) are each set to 1". This means that the chord flag DFLG is set to 1".
This is because it can also be considered a moth chord.

After processing steps 621 and 622, step 62
3, l7th, [V7t in blue table 83h
It is determined whether or not there is a root note ROOT in which the chord flags [1FLG are all "1"] for each chord of h, V7th, and at step 624, the blues table 83h is set to I +++7Lh, N'5)th+ V+
It is determined whether there is a root note ROOT in which the chord flags DFLG for each chord of +ath are all II I 11. This is because the following blues conditions 1 and 2 are used as key determination conditions in blues.

Lk two East 1L past 8f [in the Iil chord, ■7th, IV 7t
When all the chords of h+V 7th appear, it is determined that it is in a major key.

L[2 and 11 Among the past 8 chords, I 1m? t b + ■m
) It is determined that the key is in a minor key when all the chords of th+Vwa7th appear.

Now, assuming that the blues condition 1 is satisfied, it is determined in step 623 that rYEsJ, and in step 625, the most significant bit MSB of the plate steel data KMKD is set to '°1°', which represents the major key, and the same The lower bit of data KMKD is set to the corresponding root note ROOT. Further, if the blues condition 2 is satisfied, step 6
23 is rNo, and step 624 is rYEsJ. In step 626, the most significant bit MSB of the inter-board data KMKD is set to "0" representing a minor key, and the lower bits of the same data KMKD correspond. Root note R
Set to OOT. Furthermore, both blues conditions 1.
If 2 is not established, rNOJ is determined in both steps 623 and 624, and the processing of the key determination routine is terminated in step 627.

In this way, when the selected rhythm is blues, a temporary key is determined by the processing of steps 620 to 624, and the inter-board data KMKD is set by the processing of steps 625 and 626, and the program continues as shown in step 62.
You can proceed to 8.

In step 628, the most significant bits MSB of the key data MKD and the inter-board data KMKD are compared to determine whether or not the previous determined play and the set provisional key are the same in terms of length and shortness. Now, if the lengths and shorts are the same,
At step 628, rYESJ is determined by °1'+1,
In step 629, based on the rhythm type data RIIY (blues or not) and the inter-board data KMKD, memory is stored corresponding to the rhythm type (blues or other), major/minor, and note name in the key flag table 831 (Figure 2H). When the position is specified, the key flag KF of the specified storage position is
"1" is added to LG. However, the key flag is FLG.
changes from 0 to 3, and if the key flag KFLG is already "3", the addition is not performed. Next, in step 630, the rhythm type data RIIY
, the key flag table 83i is referred to again based on the Itama data MKD and key data MKD, and the key flag KFLGI related to the previous determined play (key data MKD) and the key flag related to the current detected key (tentative J1 data KMK[l) The flag is compared with FLG. In such a case, the key flag K
If the FLG book is larger than the key flag KFLG, the determination in step 630 is "NO", and the execution of the key determination routine is terminated in step 634, so that the previously decided play is not changed. This is because if the key is changed with little information, there is a risk that an error will occur in the key determination (key modulation determination).

On the other hand, as a result of the addition operation of the key flag KFLG, if the key flag KFLG becomes equal to or higher than the key flag KFLGI, it is determined as rYEsJ in step 630, and in step 631, 0 in the key data store is changed to 0 in the itama data KM. Set to the indicated value. As a result, the performance tone of the electronic musical instrument is determined or changed for the first time. Said step 63
After processing 1, in step 632, the key flag table 83
By clearing all the data in i, the table 83i is set to the initial state, and the memory corresponding to the rhythm type, major/minor, and note name in the key flag table 831 is set based on the rhythm type data RHY and key data MID. The position key flag KFLG (FLG to the key flag to which the addition operation was performed in the process of step 630) is "1".
The key setting flag MKSF is set at step 633.
After the key is set to 1', the execution of the key determination routine is terminated at step 634.

Furthermore, if the previous determined play (key data MKD) and the provisional key set above (MKO in Itama data) are different in terms of length and shortness, the judgment in step 628 is determined to be "NO", and the program continues. Direct step 6
31, and processes in steps 631, 632, and 633 are performed. In such a case, the process of steps 629 and 930 (judgment process regarding the key flag KFLG) is desired to be performed, and as a result, the key is changed immediately.
Modulation from a major key to a minor key or from a minor key to a major key will be performed preferentially.

r:''Rorun Next, the mode determination routine will be explained using the flowchart of FIG. This mode determination method works as follows: ■ When the key has not been determined yet ■ When the key has already been determined and the selected rhythm is not blues ■ When the key has already been determined and the selected rhythm is blues Since the situation differs depending on the situation, three types of cases will be explained below.

■If the key has not been determined yet In this case, the key setting flag MKSF remains set to II OIT, so after starting the mode determination routine in step 700, rNo,
That is, it is determined that the key setting flag MKSF is not ``1'', and in step 702 it is determined whether or not the pressed key chord data DI'CHD corresponding to the current chord indicates that the chord is not established. If the pressed-key chord data DPC) 10 does not represent a chord failure, it is determined in step 702 that it is rNOJ, and in step 703, the second modal table 91e (third
(Fig. 5CALE
is set as . Then, in step 705, the execution of the mode determination routine is ended.

On the other hand, if the pressed key chord data DPCHD indicates that the chord is not established, rYES is determined in step 702.

In step 704, the second modal table 91e is referenced based on the most recently detected chord (excluding the Aug chord and Dim chord), that is, the latest chord data indicated by the current table address CTAD in the chord table 83g. Then, modal data 5CALE is set in the same manner as in step 703, and the execution of the modal determination routine is ended in step 705. It should be noted that immediately after the start of the performance, if there is no chord data in the chord table 83g, no modal data is read out from the chord table 83g, and modal data 5CALE is not set.

Through the processing of steps 702 to 704, a musically acceptable mode is determined, although it lacks some accuracy.

■If the key has already been determined and the selected rhythm is not blues In this case, the key setting flag MKSF is already set to "1'°, and at the same time, the rhythm type data RHY does not represent blues, so the step After starting the mode determination routine in step 700, rYES is determined in step 701.
After the determination is J and the determination is "NO" in step 706, in step 707, as in the case of step 702, it is determined whether or not the pressed key chord data Dl'C) ID indicates that the chord is not established. is determined. Now, if the pressed key chord data DPCHD does not represent a chord failure, the determination in step 707 is "NO", and step 70
In step 8, the first modal table 91d (Fig. 3E) is referred to based on the chord data obtained by converting the pressed key chord data DPCHD into degree display, and the modal name is read from the same table 91d and set as modal data 5CALE. . That is, the pitch name data of the key data MKD is subtracted from the root note ROOT of the pressed key chord data DPCIID, the first modal table 91d is referred to according to the subtraction result and the type TYPE of the pressed key chord data DPCHD, and the modal name ( For example, I M
For IIJ, Ionian, for II a+7th, Torian, etc.) are read out. Note that if the chord data in the frequency display is from the second group onwards (see the chord tension table 91b in Figure 3C), the modal name will be changed for each group, for example, if it is a chord in the fourth group, Mixolydian, etc. Read out. Then, in step 705, the execution of the mode determination routine is ended.

On the other hand, if the pressed key chord data DPCHD indicates that the chord is not established, it is determined as rYEsJ in step 707, and in step 709, the immediately preceding detected chord (after
(excluding G chord and Dim chord), that is, chord table 83
The first modal table 91d is referred to based on the latest chord data indicated by the current table address CTAD in g that has been converted into a degree display, and the modal data 5CALE is set in the same manner as in step 708. At step 709, execution of the mode determination routine is ended.

Through the processing of steps 707 to 709, a musically appropriate mode is determined.

■If the key has already been determined and the selected rhythm is blues In this case, the key setting flag MKSF is already set to "1'" and the rhythm type data RHY represents blues. After starting the mode determination routine in step 700, it is determined that rYE S in steps 701 and 706, respectively, and then step 710
At step 702 and step 707, it is determined whether or not the pressed key chord data DPCHD represents an unsatisfied chord. Now, if the pressed key chord data DPCHD does not represent a chord failure, in step 710
It is determined as NOJ, and in step 711, the chord data obtained by converting the pressed key chord data DPC) 1D into a degree display is 17t.
It is determined whether the chords are h+IV7th or V7th. In other words, pressed key chord data DPC)
The result of subtracting the note name data of the key data MKD from the root note ROOT of l[l and the type T of the pressed key chord data DPCHD
The chord represented by YPE is I 7th, IV) th,
It is determined whether the chord corresponds to any one of the V 7th chords. In such a case, the frequency display chord is I 7th,
If it corresponds to any of the chords IV tth + V tth, rYES is determined in step 711, modal data 5CALE is set to data representing the blues mode in step 712, and the modal is selected in step 705. Execution of the determination routine is ended.

Furthermore, if it is determined in step 711 that it is rNOJ, the program proceeds to step 713, and in the same step 713, the chord data obtained by converting the pressed key chord data D P C110 into frequency representation is I m7th + IVm7th
+ Vm7th chord is determined. That is, the chord represented by the result of subtracting the note name data of the key data MKD from the root HROOT of the pressed-key chord data DPCHD and the type TYPE of the pressed-key chord data DPCHD is I 1m? ttl+lVm7th,
It is determined whether the chord corresponds to any one of the chords of Vmtth. In such a case, the frequency display chord is I n+7
If it corresponds to either of the chords th+IVm7th or Vm7th, rYES is determined in step 713, modal data 5CALE is set to data representing the minor blues modal in step 714, and step 70
At step 5, the execution of the mode determination routine is completed.

Furthermore, in both steps 711 and 713, "
NO'', that is, the chord data obtained by converting the pressed key chord data DPCIID into frequency display is I 7th, IV 7°.

V 7tb+ I 1a7th+ IV 1m7th+
If it is determined that the chord does not correspond to any of the chords of V m7th, the program proceeds to step 707, and the mode is determined by the processing consisting of steps 707 to 709.

On the other hand, if the pressed key chord data DPC) 1B indicates that the chord is not established, it is determined in step 710 as rYESJ, and in step 715, the immediately preceding detected chord (however,
(excluding chords and Dim chords), that is, chord table 83g
The latest chord data indicated by the current table address CTAD in is converted into frequency display as I 7th+■
It is determined whether or not it corresponds to any of the chords of fth+V7th, and in step 716, the chord of the converted degree is 117th+ ■m7th+
It is determined whether the chord corresponds to any of the chords of Vea and Fth. Even in the case where the
Similarly to the process in step 3, the chords converted to the frequency display are I fth, IV 7th, V fth. +I II+
If it corresponds to any of the chords 7ttl+ ■l117th+ V +m7th, steps 714 and 7 are performed based on the determination of rYES in steps 715 and 716.
Through the processing in step 12, the modal data 5CALE are set to data representing the minor blues mode and the blues mode, respectively. Also, the chord converted to the frequency display is [7t
h, (V7th+V7th+ 1m7tb+ Vm7
th, VI11? , h, it is determined as rNOJ in both steps 715 and 716, and the program proceeds to step 707, where the mode is determined by the processing consisting of steps 707 to 709. Ru.

Through the processing of steps 710 to 716, a more appropriate mode for the blues is determined, and at the same time, even if it is desired that the blues mode or minor blues mode be determined by the processing, the above-mentioned processing of steps 707 to 709 is performed. The appropriate mode is determined by

Like this, the key! When the rhythm interrupt signal RINT from the tempo oscillator 7o arrives at the CPU 82, which is executing the main program and its subroutines consisting of processing for determining chords, keys, and modes in response to key presses in step 10, and other processing, the CPU 82 Each time the separate signal RINT arrives, a rhythm interrupt program corresponding to the flowchart of FIG. 12 is executed to control the generation of percussion instrument sounds and accompaniment sounds, so the rhythm interrupt program will be explained below.

1 Rhythm Entry Program Execution of this rhythm interrupt program starts at step 800 in FIG. 12, and at step 801 it is determined whether the rhythm run flag R11N is 11111 or not. In such a case, the rhythm run flag RUN is set in step 125 above.
If it is set to ``1'' by the process of (main program in FIG. 5), rYES in step 801;
If it is determined that this is the case, the program proceeds to step 802 and subsequent steps to control the generation of percussion instrument sounds and accompaniment sounds, and if the flag RUN is "0", the generation of the percussion instrument sounds and accompaniment sounds is not controlled and proceeds to step 817. Execution of the rhythm interrupt program ends at .

In step 802, rhythm type data RII
The rhythm pattern memory 92 is referred to in accordance with Y and tempo count data TCNT, and the rhythm type data old IY
All percussion instrument sound data PITDI and percussion instrument sound data P which correspond to the selected rhythm expressed by and with respect to the timing expressed by tempo count data TCNT.
IrO2, etc. are read out from the rhythm pattern memory 92, and the percussion instrument sound data PITDl and percussion instrument sound data l'
1TD2 etc. are connected to the percussion instrument sound signal generation circuit 6 via the bus 50.
1. As a result, the percussion instrument sound signal generation circuit 61
forms a musical tone signal related to a percussion instrument represented by the supplied percussion instrument sound data I'lTO, percussion instrument sound data PITD2, etc. and supplies it to the sound system 1-03, so that the percussion instrument sound is generated from the same system 63. Ru. In addition,
The data read out from the rhythm pattern memory 92 is
If it indicates OP, the data is percussion instrument sound signal generation port i
? 361, and the generation of percussion instrument sound signals should also be controlled.

After the processing in step 802, the program advances to step 803, where the variable i is set to "1".
” is set. This variable i specifies the number of accompaniment tone sequences, that is, the accompaniment pattern memories 93-1 to 93-n, and changes from 1 to n. Next, in step 804, the i-th series accompaniment pattern memory 93-1 is referred to according to the rhythm type data RHY, modal data 5CALE, and tempo count data TCNT, and the selection represented by the rhythm type data RHY and modal data 5CALE is performed. Compatible with rhythm and mode, and tempo count data T
Accompaniment pattern data regarding the timing represented by CNT is read. Then, the type of the read accompaniment pattern data is determined in steps 805 and 806.

That is, if the read accompaniment pattern data is related to key-on data KON and pitch data PINT, rNo is returned in step 805.

Then, in step 806, rYESJ is determined, and the program proceeds to step 807. In step 807, it is determined whether the pressed key chord data DPCHD indicates that the chord is not established. In this case, if the pressed key chord data D P CII D does not represent +09 failure, r N,
OJ is determined, and in step 808 pitch data ROOTH' is obtained by adding the root note ROOT of the pressed key chord data D P CII D and the read pitch data PINT.
lNT and key-on data KON are supplied to the i-th series of accompaniment signal generation circuits 62 via the bus 50. As a result, the i-th musical tone signal forming channel in the accompaniment tone signal generation circuit 62 is connected to the supplied pitch data ROOT+PIN.
Since a musical tone signal with a pitch corresponding to T is formed and supplied to the sound system 43, the system 43 generates n pieces of pressed-key chord data [albejo notes, bass notes, chord notes, etc. related to the chord represented by 1 PCHD]. Of the accompaniment sounds,
Musical tones related to the i-th series of accompaniment tones are generated.

On the other hand, if it is determined in step 807 that the key-pressed chord data DPC1FD represents a chord failure, then in step 809 it is determined whether or not there is chord data in the chord table 83g.

In this case, if there is chord data in the table 83g, rYES is determined in step 809, and the latest chord data in the chord table 83g specified by the current table address CTAD is read out in step 810. At the same time, the chord data is key pressed chord data DPC.
Instead of HD, it is used to generate accompaniment sounds in the same manner as in step 808. That is, pitch data R is obtained by adding the root note ROOT of the chord data and the pitch data PINT read from the accompaniment pattern memory 93-1.
OOT+PINT and key-on data KON are bus 50
is supplied to the i-th series of accompaniment sound signal generation circuit 62 via.

With this, even if you want to detect a chord from the currently pressed key,
Appropriate accompaniment sound can be obtained. Further, if there is no chord data in the chord table 83g immediately after the start of the performance, rNo is determined in step 809.

It is determined that this is the case, and the program proceeds to step 812. In this case, it is desired that the i-th series of accompaniment tones be generated.

Further, returning the explanation to the processing of steps 805 and 806 described above, if the accompaniment pattern data read out from the accompaniment pattern memory 93-1 by the processing of step 804 is OF as key-off data, steps 805 and 806
6, respectively rNo.

It is determined that the key-off data is OF at step 811.
is supplied to the i-th series of accompaniment signal generation circuits 62 via the bus 50. As a result, the i-th series of musical tone signal forming channels in the accompaniment tone signal generation circuit 62 attenuates the i-th series of accompaniment tone signals based on the supplied key-off data KOF, and then stops generating them. As a result, the i-th series of accompaniment sounds from the sound system 63 gradually disappear. After processing step 811, the program proceeds to step 812.

Further, if the accompaniment pattern data read out from the accompaniment pattern memory 93-1 by the processing in step 804 indicates NOP, rYEs is set in step 805.
J is determined, and the program proceeds directly to step 812. In such a case, it is desirable to perform processing related to accompaniment sounds.

After processing the i-th series as described above, "1" is added to the variable i in step 812, and while the variable i after the addition is less than or equal to n, a "NO" determination is made in step 813. Then, the program returns to step 804, and the accompaniment sound generation control routine consisting of steps 804 to 811 is performed again. This controls the generation of all the accompaniment sounds of the first to nth series.

During the cyclic process consisting of steps 804 to 813, when the variable i becomes larger than n, rYE is set in step 813.
S, and the program proceeds to step 814T-81.
The routine then proceeds to the tempo count data TCNT update processing routine consisting of step 7. That is, in step 814, "1" is added to the tempo count data TCNT, and the same data TCNT is incremented, and in step 815, it is determined whether or not the incremented tempo count data TCNT has reached "32". It will be judged. Such tempo count data TC
If NT is less than "32", in step 815 "N
O'' is determined, and the execution of the rhythm interrupt program is terminated at step 817. Further, when the tempo count data TCNT reaches "32", step 815
rYESJ is determined in step 816, and the data TCNT is initialized to "0" in step 816.
At step 7, execution of the rhythm interrupt program ends.

As can be understood from the above explanation of the operation, according to the above embodiment, musically appropriate chords, keys, and modes are automatically detected in response to key presses on the keyboard 10, and appropriate pitches are automatically detected based on the detection. Since the accompaniment sounds are automatically generated according to the rhythm, musically advanced automatic accompaniment sounds can be obtained. Further, in the above embodiment, in addition to the means for automatically determining the key according to the chord performance information, the major key operator 22, the minor key operator 23, and the key! Since a means for manually determining the key according to the operation in step 10 is provided, if the user knows the key at the beginning of the performance piece, the key can be specified from the beginning of the piece. In such a case, the means for automatically determining the key functions to automatically determine the key modulation during the performance.

Note that the above embodiment may be modified as follows.

(1) In the above embodiment, when determining the key when the rhythm type is other than blues, step 6 in FIG.
In steps 612 to 614, a specific chord progression is detected and two types of keys are assumed, and in steps 612 to 614, the past eight chords are compared by comparing the sum of the tension levels of the past eight chords for the two types of keys. At the same time, if the key cannot be determined even after this inspection, in steps 617 to 619, the above-mentioned two types of keys of all pressed keys corresponding to the past 8 chords are checked. The key is finally determined by determining the suitability of the key.

However, if some deterioration in musicality is allowed in order to reduce costs, steps 612 to 614 and 617 to 619 can be omitted and the key corresponding to the root note RQOT can be determined by only steps 604 to 610. You may also do so. In addition, steps 612 to 614 or step 6
Any one of the processes 17 to 619 may be omitted.

These methods are sufficient for simple songs.

In addition, in the above embodiment, as described above, step 6
04 to 610, the key is determined by two consecutive chord progressions, but the key may be determined by three or more consecutive chord progressions. In such a case, if three or more consecutive chord data are read in the past for a newly detected chord from the chord table 83g (FIG. 2F) and compared with the predetermined chord progression condition, it is possible to make a determination. good.

(2) In the above embodiment, in the first and second chord detection routines (FIGS. 8 and 9C), the number of tension notes TE is
The chord with the smallest NSU is finally decided as the deciding chord, and if there are multiple minimum tension note numbers TENSU, the chord including the lowest tension note number LTNQ among them is finally decided as the deciding chord. Instead of this determination method, the chord with the smallest total value of the tension note numbers LTNO of all the tension notes for each chord may be finally determined as the determined chord. In such a case, the number of tension notes TENS is stored in the chord detection buffer register 83c in steps 341 to 34 in FIG.
Instead of writing U and the minimum tension note number LTNO, the total value of the tension note numbers TNO of all the tension notes for each detected chord is calculated, and the total value is written in the chord detection buffer register 83c. In the first and second chord detection routines, the chord having the smallest written total value may be finally determined as the determined chord.

Further, in the above embodiment, step 321 in FIG.
After writing information regarding all possible chords into the chord detection buffer register 83c through the circular process including steps 329 to 329 and steps 341 to 349, the first chord detection routine of FIG. 8 and FIGS. 9A to 9C are performed. In the second chord detection routine, the most probable chord is finally determined as the determined chord while reading information regarding all the chords, but the chord detection buffer register 83c
An area for storing only information regarding one chord is provided in the chord detection buffer register 83c, and each time a possible chord is detected by the processing of steps 310 to 315 in FIG. 7, the information in the chord detection buffer register 83c is The information in the chord detection buffer register is updated by comparing the information regarding the newly determined chord using a method similar to the processing of the first and second chord detection routines, and the information in the chord detection buffer register is updated. A successive approximation method may be adopted in which the determined chord is automatically finally determined at the time when the processing related to the last detected chord is completed through the processing of steps 310 to 315. In this way, the capacity of the chord detection buffer register 83c can be reduced.

(In the embodiment described in 31-1-, a plurality of accompaniment pattern memories 93-1, 93-2...93-0 are provided corresponding to each rhythm type and each mode, and each memory 93-193 -2/93-n was designed to store pitch data PINT corresponding to semitone interval differences from the fundamental tone of various modes, but instead of the pitch data PINT, frequency data (rl, , r2 in Fig. 3G) is stored.・・・・・・
) to accompaniment pattern memory 93-1.93-2...93
-n, and a common accompaniment pattern memory is used for various modes, so that multiple series of accompaniment pattern memories are stored only for each rhythm type 93-1.93-
2...93-n may be provided. In such a case, frequency data may be converted to pitch data I'l as in the above embodiment.
A frequency-tone interval table for converting into NT (semitone interval difference from the fundamental tone of various modes) is separately provided, and accompaniment pattern data is read in accordance with rhythm type data RHY and tempo count data TCNT in step 804 of FIG. If the read accompaniment pattern data is the frequency data, the frequency data is converted into the pitch data P according to the modal data 5CALE in steps 808 and 810.
After changing to INT, addition processing of the converted pitch data PINT and root note data ROOT may be performed. For example, accompaniment pattern memory 93-1, 93-2...
- If the power data read from 93-n is not "3", if the mode data 5CALE represents the Ionian mode, the power data "3" is converted to "4",
Further, if the mode data 5CALE represents the Torian mode, the power data "3" is converted to "3" (3rd G
(see figure). This allows the accompaniment pattern memory 93 to have a small capacity.

(4) In the above implementation, when the rhythm type is other than blues, the key is determined for each major and minor key by detecting a specific chord progression, and when the rhythm type is blues, the key is determined from the predetermined past to the present. The key determination method for major and minor keys was changed depending on only the two types of musical styles, in other words, the key determination method for major and minor keys was changed depending on only the two types of musical styles. This key determination method for each musical style is further subdivided, and depending on the rhythm type specified by the rhythm selection operator group 31, a specific chord progression or a specific chord generation different from the above embodiment is determined for each rhythm type. The key may be determined by detecting the presence or absence.

(5) In the above embodiment, an example in which the present invention is applied to an electronic musical instrument equipped with a keyboard 10 has been described. It can also be applied to devices equipped with an input interface for inputting. In such a case, the input interface is supplied almost simultaneously from another electronic musical instrument or a device equipped only with a keyboard, and inputs a plurality of note name information specifying chords one after another, and in step 102 of FIG. The presence or absence of pitch name information in an input interface into which pitch name information is input may be determined, and the import of pitch name information from the input interface may be controlled in step 104. This makes it possible to form optimal accompaniment sounds simply by inputting key information (pitch name information) from another musical instrument or a device equipped only with a keyboard.

[Brief explanation of the drawing]

FIG. 1 is an overall block diagram of an electronic musical instrument according to an embodiment of the present invention, FIGS. 2A and 2 are detailed diagrams of various tables and registers in the working memory of FIG. 1, and FIG. 3A,
Figures 3C, 3D, 3E, and 3F are detailed views of the various detection tables in Figure 1, Figure 3B is a musical notation diagram showing an example of a detected chord, and Figure 3G is an example of a mode. musical note diagram,
FIG. 4A is a detailed diagram of the rhythm pattern memory in FIG. 1, FIG. 4B is a detailed diagram of the accompaniment pattern memory in FIG. 1, and FIGS. 5 to 12 are programs executed by the microcomputer in FIG. 1. This is a flowchart. Explanation of symbols 10...keyboard, 20...key setting operation panel section, 30
. . . Rhythm control operation panel section, 61. Percussion instrument sound signal generation circuit, 62. . . Accompaniment sound signal generation. Main circuit, 70... Tempo oscillator, 80... Microcomputer, 81... Program memory, 82...
・CPU, 83... Working memory, 83a...
Pressed key buffer register, 831)...Buffer register for pressed key flag, 83C...Chord detection buffer register, 83d...Rotation register, 83e.
... Root note counter, 83f ... Key press flag table, 83g ... Chord table, 83h ... Blue staple, 83i ... Key flag table, 91 ...
Various detection tables, 91a...Chord constituent note table, 91b...Chord tension table, 91c...
Primary/Kaden chord table, 91d...1st
Modulation table, 91e...Second modulation table, 92.
...Rhythm pattern memory, 93...Accompaniment pattern memory.

Claims (8)

[Claims] (1) In a chord detection device that inputs a plurality of note name information representing each note name constituting a scale and detects a chord according to the combination state of the input plurality of note name information, a determined chord is represented. a chord storage means for storing chord information; and a chord storage means for storing chord information; chord extracting means for extracting a plurality of detected chords by respectively detecting chords having a note name as a root note; chord determining means for determining, as a new determined chord, a detected chord that has a predetermined progression relationship from the previous chord represented by the previously determined chord information, and storing chord information representing the newly determined chord in the chord storage means; A chord detection device comprising: (2) In a chord detection device that inputs a plurality of note name information representing each note name constituting a musical scale and detects a chord according to a combination state of the input plurality of note name information, a determined chord is represented. a chord storage means for storing chord information; a key specifying means for specifying a key; and a combination of a plurality of note names each specified by the input note name information in response to input of new note name information. chord extracting means for extracting a plurality of detected chords by respectively detecting chords having each of the specified note names as a root note according to the state; and storing the key and chord specified by the key specifying means in the chord storage means. Among the plurality of detected chords extracted by the chord extracting means, the previous chord and the designated key have a predetermined progressive relationship based on the previous chord represented by the chord information. 1. A chord detecting device comprising: chord determining means for determining a detected chord as a new determined chord, and storing chord information representing the newly determined chord in the chord storing means. (3) Inputting a plurality of note name information representing each note name forming a scale, and specifying a key in a chord detection device that detects a chord according to the combination state of the input plurality of note name information. A plurality of detected chords are detected by using a key specifying means and a chord having each of the specified note names as a root note according to the combination state of the plurality of note names respectively specified by the input note name information. and chord determining means for determining a particular chord in the key specified by the key specifying means as a determined chord from among the plurality of detected chords extracted by the chord extracting means. Characteristic chord detection device. (4) In a chord detection device that inputs a plurality of note name information representing each note name constituting a scale and detects a chord according to a combination state of the input plurality of note name information, a determined chord is represented. a chord storage means for storing chord information; a key specifying means for specifying a key; and a combination of a plurality of note names each specified by the input note name information in response to input of new note name information. a chord extraction means for extracting a plurality of detected chords by respectively detecting chords having each specified note name as a root note according to a state; and a chord extraction means for extracting a plurality of detected chords from among the plurality of detected chords extracted by the chord extraction means. , a detected chord whose tension level determined according to the key specified by the key specifying means has a predetermined relationship with the previous chord represented by the chord information stored in the chord storage means is newly determined as the determined chord; and chord determining means for storing chord information representing the newly determined chord in the chord storing means. (5) The chord extracting means includes a root note setting means for setting each of the specified plurality of note names as a root note, and a predetermined root note from the set root note for each root note set by the root note setting means. 5. The chord detecting device according to claim 1, further comprising determining means for determining whether or not a note name having a frequency relationship of 1 exists among the specified plurality of note names. (6) The chord detecting device according to claim 5, wherein the note names having the predetermined frequency relationship are basic constituent notes of a chord and are stored in advance for each type of chord. (7) The chord detecting device according to claim 2, 3 or 4, wherein the key specifying means is configured to automatically detect and specify a key according to the determined chord. (8) The chord detecting device according to claim 2, 3 or 4, wherein the key specifying means comprises a key specifying operator for specifying a key.