JP2000112472A - Automatic music composing device, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a music having a desired length of time in an automatic music composing device. SOLUTION: In a music composing routine, a user inputs the composing conditions such as the length of time of a music to be composed, the tempo and the rhythm in a step 50. In a step 52, the number of bars required is computed from the inputted length of time, the tempo and the rhythm. In a step 54, composition data corresponding to the number of bars computed (music constitution data and music feature data) are retrieved from a database and the data are displayed on a screen. Then, the user selects arbitrary data among the composition data being displayed in a step 56. Then, in a step 58, a music is automatically generated using the selected composition data. In a step 60, a discrimination is made to determine whether the length of the time of the composed music matches with the length of the time inputted or not. If they do not match with each other, the tempo is minutely adjusted in a step 62 so that the time length condition is satisfied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic music apparatus and a recording medium, and more particularly to a method for inputting a desired time length and for automatically generating an automatic music piece based on music composition data having a time length corresponding to or adapted to the input time length. By doing so, it is possible to obtain a tune of a desired time length.

[0002]

2. Description of the Related Art Conventionally, there has been known an automatic music composition apparatus which performs an automatic music composition based on composition data read from a database (for example, Japanese Patent Application Laid-Open No. 9-5027).
No. 8). In this case, the composition data is A
Data including song composition data representing song composition by phrase patterns such as -BCC 'and song feature data representing song features such as melody features and rhythm features are used.

[0003]

According to the above-mentioned prior art, the time length of the music is not known until the automatic music processing is completed, and the music having the desired time length cannot be obtained.
It is conceivable to adjust the tempo for time adjustment after the completion of the automatic composition process, but there is a possibility that the song may unnaturally have a fast or slow tempo.

[0004] It is an object of the present invention to provide a new automatic music composition device capable of obtaining a music of a desired time length.

[0005]

A first automatic music composition apparatus according to the present invention has a storage means for storing composition data for each bar, an input means for inputting a time length of a music piece to be created, and an input means for inputting the time length. Calculating means for calculating the number of measures corresponding to the tempo and the time signature on the basis of the time length inputted by the means; reading means for reading the composition data corresponding to the number of measures calculated by the calculating means from the storage means; Music composition means for automatically creating a music piece based on the composition data read from the storage means.

In such an automatic music composition device, detection means for detecting that the time length of the music created by the composition means does not match the time length input by the input means, and Correction means for correcting the tempo of the music created by the composition means so that the time length of the music created by the composition means matches the time length of the input by the input means in response to the mismatch detection May be further provided.

According to the first automatic music composition device of the present invention, when a desired time length is inputted for a music to be created,
The number of bars corresponding to the tempo and the beat is calculated based on the time length related to the input. Then, music composition data corresponding to the calculated number of measures is read from the storage means, and a music piece is automatically created based on the read music composition data. As a result, the tune related to the creation has a time length that matches or approximates the time length related to the input.

When the detecting means and the correcting means are provided as described above, the time length of the tune related to the creation can be made to exactly match the time length related to the input.

A second automatic music composition device according to the present invention has a storage means for storing a plurality of music composition data for each bar number, an input means for inputting a time length of a music piece to be created, and an input means for inputting the time length. Calculating means for calculating the number of measures corresponding to the tempo and the time signature on the basis of the obtained time length, and searching the storage means for a plurality of composition data corresponding to the number of measures calculated by the calculating means, and Presenting means for presenting the music composition of the composition data of the above, selecting means for selecting any of the music compositions presented by the presenting means, and composing data having the music composition selected by the selecting means. A reading means for reading from the storage means; and a music composition means for automatically creating a music piece based on the music composition data read from the storage means.

According to the second automatic music composition device of the present invention, when a desired time length is inputted for a music to be created,
The number of bars corresponding to the tempo and the beat is calculated based on the time length related to the input. Then, a plurality of composition data corresponding to the number of measures related to the calculation is retrieved by the storage means, and a music composition of the plurality of composition data is presented. When an arbitrary one of the music compositions related to the presentation is selected, the music composition data having the music composition related to the selection is read out from the storage unit, and a music piece is automatically created based on the read music composition data. As a result, the tune to be created has a time length that matches or approximates the time length of the input and has a tune configuration related to selection.

[0011] A third automatic music composition device according to the present invention has a storage means for storing a plurality of music composition data for each of a plurality of different time lengths, and inputs a time length of a music piece to be created. Input means for performing the operation, reading means for reading any music composition data having a time length matching the time length inputted by the input means from the storage means, and music composition data read from the storage means. Music composition means for automatically creating music.

According to the third automatic music composition device of the present invention, when a desired time length is inputted for a music to be created,
Any music composition data having a time length matching the input time length is read from the storage means, and a music piece is automatically created based on the read music composition data. As a result, the tune related to the creation has a time length that matches or approximates the time length related to the input.

In the third automatic composition device according to the present invention, the detection means and the correction means can be provided in the same manner as described above for the first automatic composition device. In this way, the time length of the tune related to the creation can be surely matched with the time length related to the input.

[0014]

FIG. 1 shows a circuit configuration of an electronic musical instrument provided with an automatic musical composition apparatus according to an embodiment of the present invention. This electronic musical instrument generates a musical sound by a small computer such as a personal computer. , Music composition and the like are controlled.

A bus (CPU) 1 (central processing unit)
2, ROM (Read Only Memory) 14, RAM
(Random access memory) 16, detection circuit 18,
20, display circuit 22, sound source circuit 24, effect circuit 26, external storage device 28, MIDI (Musical Instrument Digit
al Interface) interface 30, a communication interface 32, a timer 34, and the like.

The CPU 12 executes various processes for tone generation, song creation, and the like according to programs stored in the ROM 14. The song creation process will be described later with reference to FIG.

In the ROM 14, in addition to the program, 12
A plurality of music composition data is stored as a database for each measure such as a measure. As an example, each piece of composition data is composed of music composition data representing a music composition by a phrase pattern such as AA'-BC and the number of measures for each phrase (for example, each measure is 4 measures), and a melody feature ( Music characteristic data representing music characteristics such as a pitch change pattern) and a rhythm characteristic (rhythm pattern). As a plurality of composition data for each bar number, data having different music compositions (segment patterns and / or the number of bars for each passage) are stored. This is to enable the user to select music composition data having a desired music composition.

The RAM 16 includes various storage units used for various processes by the CPU 12. The main storage units include a music composition condition storage unit 16A, a music composition data storage unit 16B, and a music data storage unit 16C. Contains.

The detection circuit 18 detects key operation information from the keyboard 36. The detection circuit 20 includes the switch group 3
8 to detect the operation information of various switches.
The switch group 38 includes, for example, a keyboard capable of inputting characters and numerical values, and includes a mouse.

The display circuit 22 enables various displays by controlling the display operation of the display 40.

The tone generator 24 has a plurality of tone generating channels. As the tone generation method, any method such as a waveform memory method, an FM method, a physical model method, a harmonic synthesis method, a formant synthesis method, an analog synthesizer method using VCO, VCF, VCA, or the like can be adopted. Further, the tone generator circuit 24 is not limited to the one using dedicated hardware, but may be a combination of a DSP (digital signal processor) and a microprogram, or a combination of a CPU and software. Further, the plurality of tone generation channels may be constituted by a plurality of corresponding circuits,
It may be formed by using one circuit in a time-division manner.

The effect circuit 26 adds effects such as chorus and reverb to the tone signal generated from the tone generator 24. The tone signal sent from the effect circuit 26 is
The sound is supplied to the sound system 42 and converted into sound.

The external storage device 28 includes HD (hard disk), FD (floppy disk), CD (compact disk), DVD (digital multipurpose disk), M
One or more types of recording media such as O (magneto-optical disk) can be attached and detached. When a desired recording medium is mounted on the external storage device 28, the RAM 16
Data can be transferred to If the mounted recording medium is a writable medium such as HD or FD, the RAM 1
6 can be transferred to a recording medium.

As a database of composition data, R
Instead of the OM 14, a recording medium of the external storage device 28 (HD, FD, CD, DVD, MO, or the like) may be used.
As the program recording means, a recording medium of an external storage device can be used instead of the ROM 14. In this case, the program recorded on the recording medium is transferred from the external storage device 28 to the RAM 16. Then, the CPU 12 is operated according to the program stored in the RAM 16.
By doing so, it is possible to easily add a program, upgrade a version, and the like.

The MIDI interface 30 is provided for transmitting and receiving performance information and the like to and from another MIDI device 44 such as an automatic performance device.

The communication interface 32 is provided for performing information communication with a server computer 48 via a communication network 46 (for example, a LAN (local area network), the Internet, a telephone line, etc.). Programs and various data necessary for implementing the present invention are stored in a RAM from a server computer 48 via a communication network 46 and a communication interface 32.
16 or the external storage device 28 in response to a download request.

The timer 34 receives the tempo data T
The tempo clock signal TCL is generated at a cycle corresponding to M. The tempo clock signal TCL is supplied to the CPU 12 as an interrupt command. The CPU 12 starts an interrupt process for each clock pulse of the tempo clock signal TCL. By utilizing such an interruption process, an automatic performance can be performed based on the music data in the storage section 16C.

In the electronic musical instrument described above, the CPU 12
Supplies the pitch information and the sounding instruction signal corresponding to the pressed key to the tone generator circuit 24 each time the key is pressed on the keyboard 36. The tone generator 24 generates a tone signal having a pitch corresponding to the pressed key in accordance with the pitch information and the tone generation command signal. In this way, a manual performance sound can be generated.

FIG. 2 shows a display tempo volume used in the embodiment of the present invention. The tempo volume TV is displayed on the display 4 when executing the composition routine shown in FIG.
0 is displayed on the screen 0 and is used for setting the tempo.

The tempo volume TV has an elongated shape on the left and right, and displays a tempo scale such as "40", "120", "200", etc., in the number of quarter notes per minute along the longitudinal direction. At the same time, an instruction mark Tm is displayed below the tempo scale. The instruction mark Tm can be moved left or right as indicated by an arrow L or R by operating a switch in the switch group 38 or dragging the mouse. The tempo is set corresponding to the stop position of the instruction mark Tm, and the tempo value related to the setting is displayed on the display unit Td, for example, as “100”. When automatically playing a song, the tempo value of the tempo data TM can be set by the tempo volume TV. The tempo value set here for the song to be created is a temporary tempo and may be set roughly.

FIG. 3 shows an example of a music composition routine.
Input composition conditions such as tempo (temporary tempo), time signature, key, style, musical instrument to be played, and the like. The user selects the switch group 38
The composition conditions are input by operating the middle switch or operating the mouse. The time length can be set to “3” using a numeric keypad or the like.
"0 second", the tempo is input by the tempo volume TV of FIG. 2, for example, "120", and the time signature is, for example, "4/4 time". Tempo input is "slow (quarter note = 60)", "medium (quarter note = 1)
20) "," Fast (quarter note = 140) "
May be displayed on the screen of FIG. 5 and the user can select a desired tempo. Also, the time signature may be input by displaying a typical time signature such as “4/4 time signature” or “3/4 time signature” on the screen of the display 40 and allowing the user to select a desired time signature. Time length, tempo,
Data of composition conditions such as time signatures is stored in a storage unit 16
Written in A.

In step 52, the number of measures of the music piece to be created is calculated based on the data of the time length, tempo and time signature of the storage section 16A. A specific example of the measure number calculation will be described later. Thereafter, the process proceeds to step 54.

In step 54, a plurality of composition data corresponding to the number of measures calculated in step 52 is searched in the aforementioned database, and the composition of the plurality of composition data is presented on the screen of the display 40. I do. A specific example of the music composition presented on the screen will be described later. Thereafter, step 56
Move on to

In step 56, one of a plurality of music compositions presented on the screen of the display 40 is selected. In response to the user selecting a desired music composition by operating a switch in the switch group 38 or operating the mouse, music composition data having the music composition according to the selection is read from the above-described database and stored in the storage unit 16B of the RAM 16. Load (write). Thereafter, the process proceeds to step 58.

In step 58, a melody for one song is automatically created by using the selected composition data in the storage section 16B. As the composition method at this time, the one described above as a conventional technique can be used, but another known composition method may be used. The music data representing the melody related to the creation is written into the storage unit 16C of the RAM 16.

Next, in step 60, the time length of the music piece created in step 58 is changed to the time length of the input (the storage unit 1).
(The time length indicated by the time length data in 6A). If the result of this determination is affirmative (Y), it means that a tune having a desired time length has been obtained, and the processing ends.

If the result of the determination in step 60 is negative (N), it means that a tune having a desired length of time has not been obtained, and the flow proceeds to step 62. In step 62, the tempo of the song created in step 58 is finely adjusted so that the time length of the song created matches the time length of the input. That is, a tempo value in which the time length of the tune related to the creation matches the time length related to the input is obtained, and the tempo data in the storage unit 16A is rewritten so as to indicate this tempo value. The correction of the tempo value at this time is a correction of the tempo value (temporary tempo value) relating to the input, so that only a slight correction is required. A specific example of tempo correction will be described later. After step 62, the process ends.

Next, first and second examples of music creation relating to time length designation will be described. In the first example, the time length J = 32 seconds, the tempo T = 120, and the time signature = 4/4 are specified for the music to be created in step 50. Here, the tempo T is the number of quarter notes per minute.

The time M of one measure at the time of 4/4 time is obtained by the following equation (1), and M = (60/120) × 4 = 2
(Seconds).

[0040]

(Equation 1) The required number of measures N is calculated by the following equation (2).
= 32/2 = 16 (measures).

[0041]

(Equation 2) In step 54 based on such a calculation result, 16
For example, three pieces of composition data corresponding to the bar are searched from the database. The composition of the three pieces of composition data related to the search is as follows: (1) AA'-BC, each bar is 4 bars (2) AA'-BA ', each bar is 4 bars (3) AB, each passage displays information such as 8 bars on the screen of the display 40.

In step 56, when the user selects one of the song configurations (1) to (3) related to the display, the composition data having the selected song configuration is read from the database and loaded into the storage unit 16B. Is done. Then, in step 58, music data is created based on the music composition data in the storage unit 16B, and written into the storage unit 16C.

The song data thus obtained has 16 measures and the time length J when the tempo T = 120 is J = 32 seconds. Therefore, the judgment result of step 60 is affirmative (Y). Becomes Therefore, in this case, the tempo fine adjustment process of step 62 is not performed.

In the second example, the time length J = 40 seconds, the tempo T = 80, and the time signature = 4/4 are specified for the music to be created in step 50. And 4
When the time M of one measure at the time of / 4 is obtained, M = (6
0/80) × 4 = 3 (seconds).

When the required number of measures N is obtained from the above equation (2), N = 40/3 = 13.3 (measures). If the required number of measures N is not an integer such as 13.3, then in step 54 12 measures or 1 which is an integer close to 13.3
Data search and music composition presentation are performed for four measures.

For example, in the case of 12 measures, (1) AA'-B, each measure is 4 measures (2) AA'-B ', and each measure is 4 measures (3) A- B. Each passage displays information such as six measures on the screen of the display 40. Also, 1
In the case of four measures, the composition of the music is as follows: (1) ABA ', the measure is six measures-six measures-two measures (2) ABC', the measure is two measures-six measures-six measures (3) For AB, the phrase, information such as bar 8 to bar 6 is displayed on the screen of the display 40. After this,
Step 56, as described above for the first example,
Step 58 is performed.

In the second example, the number of measures in the song to be created is 1
2 or 14, with tempo T = 80 for 12 measures
Time length J at 36 seconds, tempo T for 14 measures
= 80 seconds, the time length J is 42 seconds, and does not match the music composition condition time length J = 40 seconds. Therefore, the determination result in step 60 is negative (N), and the tempo fine adjustment process is performed in step 62. The tempo T is obtained by the following equation (3) based on the equations (1) and (2).

[0048]

(Equation 3) In the case of 12 measures, tempo T = (12/40) × 24
0 = 72, and in the case of 14 measures, the tempo T = (1
4/40) × 240 = 84. Therefore, in the case of 12 measures, the tempo data of the storage unit 16A is rewritten so as to indicate T = 72, and in the case of 14 measures, the tempo data of the storage unit 16A is rewritten so as to indicate T = 84.

In step 60, it may be determined whether or not the number of measures of the tune to be created matches the number N of measures obtained in step 52.

According to the above-described processing of FIG.
0 specifies the desired time length, tempo, and time signature, and at step 52 the required number of measures is determined based on the specified time length, tempo, and time signature. At step 58, the composition data corresponding to the determined number of measures is obtained. A song is created based on the song, and if the time length of the song does not match the designated time length, the tempo of the song is modified in step 62 so that the song matches the specified time length. Obtainable.

In step 54, a plurality of composition data corresponding to the determined number of bars is searched in the database, and the composition of the plurality of composition data is presented. In step 56, a plurality of compositions related to the presentation are presented. Since any one of the compositions is selected, and the music is created based on the composition data having the selected music composition in step 58,
As a song to be created, a song having not only a desired time length but also a desired song configuration can be obtained.

FIG. 4 shows an example of storing music composition data in a database used when executing the music composition routine shown in FIG. RO as a database
M14 or the external storage device 28 can be used.

The database has a time length of 10 seconds, 20
Composition data CD11 to CD14, CD corresponding to seconds, 40 seconds, 60 seconds, 80 seconds, 100 seconds, and 120 seconds, respectively.
21 to CD26, CD41 to CD47, CD61 to CD
68, CD81 to CD87, CD101 to CD105,
The CDs 121 to 125 are stored, and the tempo, the beat, and the number of measures are stored for each piece of composition data. Each piece of music composition data is configured to include music composition data and music characteristic data in the same manner as described above for the ROM 14.

As an example, four music composition data CD11, CD12, CD13, CD14 corresponding to a time of 10 seconds.
Are "Tempo = 96, beat = 4, number of measures =
4, "tempo = 72, time signature = 3, number of measures = 4", "tempo = 192, time signature = 4, number of measures = 8", "tempo = 1
44, time signature = 3, number of measures = 8, and different combinations of tempo, time signature, and number of measures, and different data contents such as music composition data and music feature data. It is. Therefore, the composition data CD1
The four songs created using CDs 1 to 14 respectively
Although the time length is equal to 10 seconds, the combination of the tempo, the time signature, and the number of measures is different, and the atmosphere of the melody is different. The same applies to other music composition data such as CD21 to CD26.

FIG. 5 shows a music composition routine using the stored data shown in FIG. 4. In step 70, music composition conditions for the music to be created are input. The composition conditions to be input and the method of input are the same as those described above for step 50.

Next, in step 72, the composition database which matches the time length, the provisional tempo and the time signature in the inputted composition conditions is searched in the aforementioned database, and one or a plurality of the searched composition data is searched. The content is presented on the screen of the display 40. At this time, the input time length does not necessarily have to match the time length on the composition data side, and the composition data having a time length close to the input time length may be presented. For example, if the input time length is 15 seconds, the composition data for 10 seconds and the composition data for 20 seconds may be presented. When inputting composition conditions, it is not always necessary to input the tempo and the time signature, and one or both of them may be omitted. When the input is omitted as described above, music composition data that meets conditions other than the omitted condition may be searched for and presented.

Next, in step 74, a process of finalizing or selecting one or a plurality of composition data presented on the screen of the display 40 is performed. In other words, when one piece of composition data is presented, the user responds to the operation of the switches in the switch group 38 or the operation of the mouse to determine the composition data to be presented, and the determined composition data is responded to. Is read from the above-described database and loaded (written) into the storage unit 16B of the RAM 16. When a plurality of pieces of composition data are presented, the user selects one of the plurality of pieces of composition data to be presented by operating a switch in the switch group 38 or operating a mouse. In response to this, the music composition data relating to the selection is read out from the database and loaded into the storage unit 16B.
The storage unit 16B
Is loaded with time length, tempo, time signature, and the number of measures corresponding to the composition data to be loaded.

Next, in step 76, a melody for one music piece is automatically created based on the data stored in the storage section 16B in the same manner as described above in step 58. The music data representing the created melody is stored in the storage unit 1 of the RAM 16.
Written on 6C.

Next, in step 78, it is determined whether or not the time length of the music piece created in step 76 matches the input time length. If the result of this determination is affirmative (Y), it means that a tune having a desired time length has been obtained, and the processing ends.

If the result of the determination at step 78 is negative (N), it means that a tune having a desired time length has not been obtained, and the routine goes to step 80. In step 80, the tempo of the created music (that is, the tempo stored in the storage unit 16B) matches the time length (for example, 10 seconds) stored in the storage unit 16B with the input time length (for example, 15 seconds). Make fine adjustments to Thereafter, the processing ends.

According to the above-described processing of FIG.
At step 72, 74, any music composition data having a time length matching the time length input at 0 is read from the database to the storage unit 16B, and at step 76, a music piece is created based on the music composition data at the storage unit 16B. If the time length of the music does not match the input time length, the tempo of the music is corrected in step 80 so as to match the input time length, so that the music having the desired time length can be obtained reliably.

In the processing described above with reference to FIGS. 4 and 5, one piece of composition data is stored corresponding to one set of tempo, beat, and number of measures for each time length. A plurality of composition data (for example, those having different passage patterns) are stored in correspondence with one set of numbers, so that the user can arbitrarily select any one of the plurality of composition data. It may be.

The present invention is not limited to the above embodiment, but can be implemented in various modified forms. For example, the following changes are possible.

(1) The method of adjusting the tempo is not limited to the method of uniformly adjusting the tempo from the beginning to the end of the music, but may be the method of adjusting the music for each predetermined section such as a passage or a bar, or a method of reducing (ritardando) or The adjustment may be performed in a temporary increase (Acelleland) format.

(2) The display method of the music composition is not limited to the method of displaying the phrase pattern and the number of measures for each phrase.
A display method such as “4 measures intro, 4 measures in A melody, 2 measures in B melody, 2 measures in fill-in, 4 measures in ending” may be used.

(3) In the processing of FIG. 3, the designation of the time signature (or tempo) may be omitted when the composition conditions are input. In this case, the number of measures is obtained for each time signature (or the number of measures is obtained for each tempo), composition data corresponding to the obtained number of measures is presented for each time signature (or for each tempo), and any of the composition data is obtained. What is necessary is just to make it select. The time signature (or tempo) may be determined based on other conditions (such as style designation), or may be fixedly determined in advance.

(4) When music is created using the selected music composition data, the music composition data may be modified (repeated or omitted in some sections) to match the number of measures. Further, after the completion of the song creation, a process of correcting the song data according to the music rules may be performed.

(5) The present invention can be applied not only to the creation of melody songs but also to the creation of accompaniment songs such as rhythms and basses.

(6) The present invention is not limited to the form of an electronic musical instrument, but can also be implemented in the form of a combination of a personal computer and application software. The application software may be stored in a recording medium such as a magnetic disk, a magneto-optical disk, or a semiconductor memory and supplied to the personal computer, or may be supplied to the personal computer via a communication network.

(7) The present invention can be applied not only to electronic musical instruments but also to the creation of music data used in karaoke apparatuses and the like.

(8) The present invention can be applied not only to keyboard-type electronic musical instruments but also to electronic musical instruments of stringed instrument type, wind instrument type, percussion instrument type, and the like.

(9) The present invention is not limited to an electronic musical instrument having a built-in tone generator, an automatic musical instrument, etc., but is also applicable to an electronic musical instrument in which a keyboard, a tone generator, an automatic musical instrument, etc. are connected by communication means such as MIDI or various networks. Can also be applied.

(10) The format of performance data such as melodies and chords is not limited to the “event + relative time” system in which the event occurrence time is represented by a relative time from the immediately preceding event. "Event + Absolute time" method that expresses the absolute time in a bar or bar, "Pitch (rest) + note length" method that expresses the contents of a song by the pitch and note length of the note, and the rest and rest length, and event occurrence An arbitrary method such as a method of securing a storage area for each minimum time unit and storing the event in a storage area corresponding to the event occurrence time can be used.

(11) When creating music data for a plurality of channels, data for a plurality of channels may be mixed and recorded, or recording tracks may be recorded separately for each channel.

(12) When music data is recorded, it may be recorded in a continuous area in the memory in a time-series manner, or may be dispersedly recorded in a discrete area in the memory and managed as continuous data. You may do so.

[0076]

As described above, according to the present invention, a desired time length is input, and the number of bars corresponding to the tempo and the time signature is obtained based on the input time length. The configuration is such that the automatic composition is performed based on the composition data, or the automatic composition is performed based on the composition data having a time length adapted to the input time length while inputting a desired time length. The effect of being able to create a tune having a time length that matches or approximates the time length according to.

Further, since the tempo is modified so that the time length of the tune related to the creation does not coincide with the time length related to the input, the tune related to the creation corresponds to the time length related to the input. There is also an effect that a tune having the specified time length can be reliably obtained.

Further, a plurality of composition data corresponding to the determined number of measures is retrieved by the storage means, and the composition of the plurality of composition data is presented to the user, so that the user can select a desired composition. Thus, there is an effect that a song having a desired time length and a desired song configuration can be created.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an electronic musical instrument including an automatic music composition device according to an embodiment of the present invention.

FIG. 2 is a front view showing a display-type tempo volume.

FIG. 3 is a flowchart illustrating an example of a music composition routine.

FIG. 4 is a diagram showing an example of storing music composition data in a database.

FIG. 5 is a flowchart illustrating another example of a music composition routine.

[Explanation of symbols]

10: bus, 12: CPU, 14: ROM, 16: RA
M, 16A: music composition condition storage, 16B: music composition data storage, 16C: music data storage, 18, 20: detection circuit, 22: display circuit, 24: tone generator circuit, 26: effect circuit, 28: external storage Device, 30: MIDI interface, 32: communication interface, 34: timer, 3
6: keyboard, 38: switch group, 40: display, 42: sound system, 44: other MIDI equipment, 46: communication network, 48: server computer.

Claims (8)

[Claims] 1. A storage means for storing composition data for each bar, an input means for inputting a time length of a music piece to be created, and a tempo and a time signature corresponding to the time length input by the input means. Calculating means for calculating the number of measures; reading means for reading composition data corresponding to the number of measures calculated by the calculating means from the storage means; and automatic calculation based on the composition data read from the storage means. An automatic music composition device comprising a music composition means for creating music. 2. A detecting means for detecting that a time length of a music piece created by said music composition means does not match a time length inputted by said input means, and said music composition in response to a mismatch detection by said detection means. And a correction means for correcting a tempo of the music created by the composition means so that the time length of the music created by the means matches the time length of the input by the input means. Automatic composition device as described. 3. A storage medium used in an automatic music composition device having a storage means for storing music composition data for each bar number, comprising the steps of: inputting a time length of a music piece to be created; Calculating the number of measures corresponding to the tempo and the time signature based on the calculated time length; reading the composition data corresponding to the number of measures calculated in this step from the storage means; reading from the storage means Automatically creating a music piece based on the music composition data to be created. 4. A storage means for storing a plurality of composition data for each bar number, an input means for inputting a time length of a music to be created, a tempo and a time signature based on the time length inputted by the input means. Calculating means for calculating the number of measures corresponding to the number of pieces of music; and searching the storage means for a plurality of composition data corresponding to the number of measures calculated by the calculating means, and presenting a music composition of the plurality of pieces of composition data. Presenting means; selecting means for selecting an arbitrary one of the music compositions presented by the presenting means; reading means for reading music composition data having the music composition selected by the selecting means from the storage means; A music composition means for automatically creating a music piece based on the music composition data read from the storage means. 5. A recording medium used in an automatic music composition device having a storage means for storing a plurality of composition data for each bar number, wherein a step of inputting a time length of a music composition to be created is provided. Calculating the number of measures corresponding to the tempo and the time signature based on the time length input in the step; and searching the storage means for a plurality of composition data corresponding to the number of measures calculated in this step, and Presenting the song composition of the song composition data, selecting any one of the song compositions presented in this step, and sending the song composition data having the song composition selected in this step from the storage means. A recording medium storing a program including a step of reading and a step of automatically creating a music piece based on the music composition data read from the storage means. 6. A storage means for storing a plurality of music composition data for each of a plurality of different time lengths, an input means for inputting a time length of a music piece to be created, Reading means for reading any music composition data having a time length corresponding to the set time length from the storage means, and music composition means for automatically creating a music piece based on the music composition data read from the storage means An automatic music composition device comprising: 7. A detecting means for detecting that the time length of the music created by said music composition means does not match the time length inputted by said input means, and said music composition in response to the mismatch detection by said detection means. 7. A correction means for correcting a tempo of a music piece created by the composition means so that a time length of the music piece created by the music piece means matches a time length of the music piece input by the input means. Automatic composition device as described. 8. A recording medium used in an automatic music composition device having storage means for storing a plurality of music composition data for each of a plurality of time lengths different from each other, comprising: Inputting a time length; reading any music composition data having a time length matching the time length input in this step from the storage means; Automatically creating a song based on the program.