JP3003559B2 - Music generation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for generating musical tones by a general-purpose processing unit having an arithmetic processing unit.

[0002]

2. Description of the Related Art A conventional musical sound generating apparatus is usually provided with MIDI.
(Musical Instrument Digital Interface), a performance input section for inputting performance information from a keyboard or a sequencer, a sound source section for generating musical sound waveforms, and a microprocessor (CP) for controlling the sound source section in accordance with the input performance information.
U) etc. The CPU executes sound source driver processing (performance processing) such as channel assignment and parameter conversion in accordance with the input performance information, and outputs the parameters converted to the channels assigned by the sound source section and the sound generation start instruction (note on) to the sound source section. To supply. The sound source section is an LSI
(Large Scale Integrated circuit) and other electronic circuits (hardware), and generates musical tone waveforms based on the supplied parameters. For this reason, the tone generator becomes a dedicated device for generating a tone, and it is necessary to prepare a dedicated tone generator when generating a tone.

To solve this problem, there has been proposed a tone generation method in which an application program is executed by a CPU and a tone is generated based on the application program. In this musical sound generation method, other application programs can be executed in addition to the application program for generating musical sounds.
It can be executed by a general-purpose processing unit capable of executing other functions.

[0004]

When a musical tone is generated by executing an application program by a general-purpose device having an arithmetic processing unit (CPU), one sampling period (conversion timing of a digital / analog converter) is conventionally used. Each time, a tone waveform sample of each channel is calculated and generated for each sounding channel. Therefore,
When the CPU performs the processing of each sounding channel, first, preparation processing such as reading various register values used for the previous calculation of the sounding channel from the memory to the register of the CPU is performed. After the tone generation process for the tone generation channel, the register value needs to be written to the memory for the next process. That is, since the arithmetic processing of the musical tone waveform samples of each sounding channel is generated one by one, the processing other than the musical sound generating processing for generating musical tones is performed.
There is a problem that a lot of calculation time of the CPU is spent for the preparation processing (overhead becomes large), the calculation efficiency is reduced, and the response and the tone generation processing are delayed.

[0005] In the above tone generation method, the performance process is a process of creating control information for controlling the generated tone based on the input performance information. On the other hand, the tone generator process is a process of generating waveform data of a musical tone based on the created control information. For example, normally, a performance process such as a key press detection is executed, a tone generator process is interrupted at each sampling period for the performance process, waveform data for one sample is generated, and then the process returns to the performance process. I have to.

[0006] Performance information (MIDI) is generated by a performance operation of a player or the reproduction of an event by a sequencer. When the performance information is generated, the performance information is processed by a performance process. In other words, when the performance information is generated, the CPU
Must perform performance processing in addition to normal sound source processing, so that the amount of calculation temporarily increases due to performance information generated irregularly. However, the conventional tone generation method does not support this, and the sound source processing is periodically executed with priority regardless of the presence or absence of the performance information, and the performance processing may be delayed in some cases. Was. In order to prevent such a delay in the performance process, it is conceivable to raise the priority of the performance process. However, in this case, the number of sounds temporarily decreases or the musical sound waveform is interrupted. The problem that it ends up occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tone generation method capable of reducing the overhead of a CPU. Another object of the present invention is to provide a musical sound generation method in which the processing amount is not temporarily increased.

[0008]

In order to achieve the above object, a sound generating method according to the present invention is provided for generating a designated sound.
A first step of issuing generation instructions because, designated
Assign and assign sounds to one of multiple sound channels
Control data of the specified sound corresponding to the channel
A second step of storing in the register, and a third step of issuing calculation start command at a predetermined time interval, the start of each operation
According to the instruction, the control data stored in the register
Multiple samples of waveform data for each channel based on
Sound generation on each of the above channels to generate arithmetically
A fourth step of performing a synthetic operation,
The calculation is based on the sampling cycle for the plurality of samples to be generated.
Less than the total time ,
Samples of waveform data generated by individual channels
Mix at each sample point and mix at each sample point.
A fifth step of generating a pull data, each sampling
The mixed sample data of the sample points are sequentially
It is obtained so as to include a sixth step of sequentially outputting.

In the above-mentioned sound generation method, each of the above
Issue a first intermediate operation start instruction in response to a raw instruction
The method further comprises the step of:
In the fourth step, the place according to the third step
Issuing a calculation start instruction at a fixed time interval and the first halfway calculation
Of the first intermediate operation start instruction in the start instruction issue step
In response to the issue and, from said trailing Seeded waveform data
Issuing an operation start instruction or the first intermediate operation start instruction
The waveform data of a plurality of samples corresponding to the section up to the line time is generated. Furthermore, the sound
In the generation method, in the third step, an operation start instruction
Is divided into a plurality of time intervals at which
The second halfway of issuing the second halfway operation start instruction at an interval
An operation start instruction issuance step, wherein the fourth step
In the step, the second intermediate operation start instruction is issued.
Respond to generate multiple samples of waveform data
It is a thing.

[0010] Next, another tone generating method of the present invention, a plurality
Issue a generation instruction for generating a designated musical tone
Step and whether each specified musical tone is in multiple sound channels
Assigned to one of the specified sound channels, and
The control data of the specified musical tone is
Second step for writing and storing in the channel register
And a third instruction for issuing an operation start instruction at predetermined time intervals.
Step and each operation opening issued in the third step.
The channel register of the channel according to the start command
Each specified pronunciation chord based on the control data stored in the
Arithmetic generation of waveform data for multiple samples for each channel
A fourth step of performing
The waveform data generated for each sound channel.
Mixed for each sample, and
A fifth step of generating mixed sample data;
The mixed sample data of several samples
The sixth step of converting to an analog signal every period.
Therefore, in the fourth step, the channel is larger than the other channels.
At least one channel generating a tone with a loud volume.
According to the predetermined conditions that prioritize the channel,
It is intended to perform arithmetic generation .

Next, still another tone generating method according to the present invention is a method for generating one or a plurality of designated musical tones.
Or a first step of receiving a plurality of generation instructions, before
Each specified musical tone in response to a note generation instruction
Assigned to each one of the channels,
The sound control data is assigned to each specified tone.
Write to the channel register corresponding to the sound channel
No and a second step, easy to be generated in each tone generation channel
A third step of determining the importance of the sound, and a calculation start instruction
A fourth step of sequentially issuing, the fourth step
In response to each of the operation start instructions issued by
Based on the control data stored in the channel register, and
The duplication is performed according to the importance determined in the third step.
A fifth step of generating waveform data for a plurality of samples for an arbitrary number of the sounding channels, and generating the waveform data for each sounding channel in the fifth step.
The divided waveform data for each channel is
Mixed for each sample, it is obtained so as to comprise a <br/> fifth step of generating a mixed sample data.

Still another tone generating method of the present invention, 1 or
Or one or more for generating a plurality of specified musical tones.
A first step of receiving a number of generation instructions, the generation life
In response to the command, the specified musical tone
Channel assigned to the specified sound channel, and
The control data of the specified tone is converted into the specified tone.
Channel level corresponding to the assigned sound channel
The second step of writing to the register and the operation start instruction
In response to the third step issued next and each operation start instruction
And stored in the channel register of the channel.
Multiple samples for each sound channel based on control data
A fourth step of performing an operation to generate minute waveform data, and generating the waveform data for each tone generation channel in the fourth step.
The obtained waveform data is used for each of the plurality of samples.
5th step to mix the
And for all said specified pronunciation channels
Is determined to not complete within a given time period.
When at least one sound channel is
Sixth step for issuing an instruction to change the generation of waveform data
And a tip . Further of the present invention
Another musical tone generation method is one or more specified musical tones.
Receiving one or more generating instructions for generating
Step 1 and in response to the generating instruction,
Music to one of multiple sound channels
The control data of the specified musical tone
Channel corresponding to each sound channel to which is assigned
Second step of writing to a register, and an operation start instruction
And a third step of sequentially issuing
In response, it is stored in the channel register of the channel.
Multiple samples for each sound channel based on the
A fourth step of generating waveform data for the pull,
Waves generated for each pronunciation channel in the fourth step
Shape data is mixed for each of the multiple samples
And a fifth step of generating mixed sample data.
The fourth step comprises the step of providing a wave within a particular time period.
Which pronunciation channels can generate shape data
And select the sound channel determined to be possible.
Only when the waveform data is generated.
is there. Still another tone generation method according to the present invention comprises one or more
One or more originating in order to generate the specified tone number
Receiving a raw instruction, responding to the generated instruction;
Answers each specified musical tone to multiple sound channels.
Control data of the designated musical tone
Each tone channel assigned to each specified tone
The second step of writing to the channel register corresponding to
And a third step of sequentially issuing an operation start instruction;
In response to each operation start command, the channel of the channel
Each sound channel based on the control data stored in the
Fourth generation of waveform data for multiple samples for each channel
Step, and in the fourth step, each sounding channel
The waveform data generated for
Mix each sample and generate mixed sample data
And the fourth step includes a pronunciation step.
Each source is executed according to the predetermined processing order for the channel.
Generate waveform data for multiple samples of sound channel
Performing an operation, and executing the waveform data obtained in the fourth step.
During execution of the data generation operation, the operation is not completed within a predetermined time.
When it is determined that the
The data generation operation is not executed. Book
According to still another tone generation method of the invention, a plurality of designated tones are generated.
A first step of issuing a generate instruction to generate
I want to specify a specified musical tone from multiple pronunciation channels
Assign to one of the sounding channels and control the specified tone
The data is stored in the channel register of each designated sounding channel.
A second step of writing and storing in the
According to the importance of the musical tones generated by the specified pronunciation channel
To determine the calculation order of each specified sound channel
3rd step and issue operation start instruction at predetermined time intervals
A fourth step to be issued and issued in the fourth step
The specified sounding channel in response to the
Based on the control data stored in the channel register of the
Fifth generation of arithmetically generating waveform data for multiple samples
And each of the plurality of samples
Mix the waveform data generated by the channels and
Sixth step of generating mixed sample data for pull
And the mixed sample data of the plurality of samples
Seventh step of converting to an analog signal for each ring cycle
And in the fifth step, the third step
Each specified according to the operation order determined by the step
Music is generated for each sound channel, and
Tone generation too late, varying in the seventh step
When the converted analog signal may be interrupted
At the time of the sounding channel in the middle of the calculation order.
By ending the tone generation operation, the analog signal
Is not interrupted.

According to the present invention, since the preparation process for each tone generation channel only needs to be performed once for the calculation of a plurality of tone waveform samples, the overhead can be reduced. Therefore, the quality of the generated musical sound can be improved, and the number of simultaneously sounding channels can be increased. Also, the calculation of the musical tone waveform sample
If the processing is performed every time a DI event is input, the calculations are dispersed, and a decrease in the number of sounds due to the sound initial processing can be prevented. Further, of the sounding channels that are being generated, channels whose tone levels (AEG waveforms) are sufficiently attenuated are excluded from the calculation target from that point on, and are made non-sounding channels.

Further, when performance information is generated, a performance information receiving process is performed, and tone control or waveform generation based on the received performance information is included in a main step executed during an idle time of the receiving process. Therefore, an increase in the processing at the time when the performance information is generated can be dispersed within the free time, and a temporary increase in the processing can be prevented.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a configuration of a musical sound generating apparatus capable of executing each embodiment of the musical sound generating method of the present invention.
Shown in In FIG. 1, reference numeral 1 denotes a microprocessor (CPU) that executes an application program or the like to perform various controls such as generation of musical tone waveform samples, and 2 denotes a read-only memory (R) storing preset tone color data and the like.
OM), 3 is a random access memory (RAM) 4 having storage areas such as a work memory area, a tone color data area, an input buffer area, a channel register area, and an output buffer area of the CPU 1. A timer for instructing the timing to the CPU 1, a MIDI interface 5 for inputting a MIDI event and outputting a generated MIDI event, and a keyboard 6 for a personal computer provided with keys such as alphabets, kana, numbers, and symbols. .

Reference numeral 7 denotes a display (monitor) for allowing a user to interact with the musical sound generating apparatus. Reference numeral 8 denotes a musical tone waveform used for generating musical tone waveform samples while installing an application program such as a musical tone generating program. A hard disk (HDD) 9 in which data and the like are stored transfers data of musical tone waveform samples stored in an area designated by a part of the RAM 3 directly without passing through the CPU 1 and performs a certain sampling. A reproducing unit (DMA; Direct Memory Access) 10 which supplies a digital-to-analog converter (DAC) 10 at every cycle (for example, 48 kHz), a digital-to-analog converter (DAC) 10 which receives the data of the musical tone waveform sample and converts it into an analog signal ) And 11 are analog signals output from the DAC 10 This is a sound system that emits a converted musical sound signal. The above configuration is a personal computer,
It is equivalent to a workstation or the like, on which the tone generating method of the present invention can be performed.

As described above, the RAM 3 has an area for storing various data. FIG. 2 shows an area for storing timbre data, FIG. 3 shows an area for an input buffer, and FIG. 4 is shown in FIG. 4, and the area of the output buffer is shown in FIG. In the area shown in FIG. 2, PD1, PD2,..., PD16 are 16 types of timbre data, and each timbre data is applied with data for specifying a waveform of each range (each range waveform specification), vibrato, and the like. LFO (Low Frequency Oscillato)
r) control data (LFO control OD), filter envelope generation control data for controlling the tone color filter characteristics (FEG control OD), envelope generation control data for controlling the amplitude (AEG control OD), velocity The data includes touch control data (touch control OD) that changes the rising speed of a musical tone and other data (other OD).

Note that OD indicates original data, and the original data is processed in accordance with the touch data, pitch data, and the like at the time of sound generation instruction to generate sound data to be used by the sound source. I am trying to do it. Also, WD1, WD2,..., WDn are waveform data.
D2,..., PD16, any one of the waveform data is designated by each tone range waveform designation data in the tone color data.

Next, MIDI event data ID1, ID2, ID3,... Of note-on, note-off and various events inputted via the MIDI interface 5 are sequentially written in the area of the input buffer shown in FIG. This MIDI event data ID1, ID2, ID
By reading out 3,..., The event processing is executed in the tone generator. The MIDI event data ID1, ID2, ID3,.
Data content of DI event (for example, data 1 content)
And the data generation time (data 1 generation time). This occurrence time can be known by taking in the current time of the timer 4 when receiving the MIDI event data.

Next, the area shown in FIG. 4 is used as a channel (ch) register for storing data for controlling generation of a plurality of musical tones independent of each other. In this example, 1ch, 2ch,. An area for 32 channels of 32 channels is prepared. The area of each channel is a note number, waveform designation data (waveform designation D),
LFO control data (LFO control D), filter envelope control data (FEG control D), amplitude envelope control data (AEG control D), note-on data, other data (other D), and work used by CPU 1 when executing programs It consists of an area. The waveform designation D, LFO control D, FEG control D, and AEG control D are sounding data obtained by processing the above-described original data.

Next, the area shown in FIG. 5 is an area for a plurality of output buffers, and is used alternately as an output buffer X for generating a sound waveform. This output buffer stores tone waveform sample data SD1, SD2, S2 of each tone generation channel generated by arithmetic processing as described later.
Every time D3,... Are generated, the channels are accumulated and stored. One of the output buffers is designated as an output buffer X for generating a sound generation waveform, and is used for a waveform generation calculation. Two or more output buffers X are prepared. The simplest configuration is to use two output buffers X and to transfer the data stored in one of them to the reproducing unit (DMA) 9 and reproduce the data of the next musical tone waveform sample calculated in the other while reproducing the data. In a double buffer configuration.

The size of the output buffer can be set arbitrarily, such as 100 words, 500 words, 1K words, 5K words, etc. However, when the size is increased, the sound is delayed, and when the size is reduced, the time margin is reduced. The response decreases when the amount of calculation temporarily decreases. Therefore, in the case of real-time performance is not required, for example, in the case of a sequencer performance or the like, since the sound generation delay can be absorbed by shifting the performance timing forward, the size of the output buffer can be increased. On the other hand, when real-time performance is required, for example, when playing a keyboard,
Buffer size should be 100 ~ 2 to prevent delay of pronunciation
Preferably, it is 00 words. The above is the case where the reproduction sampling frequency is 40 kHz to 50 kHz. When the sampling frequency is set low, it is necessary to make the size smaller in order to prevent delay in sound generation.

Next, the first to fifth embodiments of the musical sound generating method of the present invention will be described. Each embodiment can be executed by the musical sound generating apparatus shown in FIG. You can do it. In the musical sound generation method according to the first embodiment of the present invention, in the musical sound generation processing for each sounding channel in which the CPU 1 executes an application program for generating a musical sound, a plurality of musical sound waveform samples, for example, 1
00 sound waveform samples are generated together. That is, in the processing of each sounding channel,
For example, a musical tone waveform sample is generated for one hundred sampling cycles of the DAC 10.

When the tone generation processing for all tone generation channels is executed at each predetermined calculation time, and the generated plurality of tone waveform samples are 100 samples, DA
Channel accumulation values for 100 sampling cycles of C10 are sequentially accumulated and stored in the output buffer. The tone waveform samples stored in the output buffer are read out one sample at a time in the sampling period by the reproduction unit (DMA) 9 after the accumulation of all tone generation channels is completed, and supplied to the DAC 10 to generate sound from the sound system 11. Is done. The calculation time is controlled so that, when the tone generation processing is executed by using a plurality of output buffers alternately, the tone waveform samples are generated without interruption and can be reproduced at intervals.

According to the musical tone generation method of the first embodiment, the preparation process for each tone generation channel only needs to be performed once for a plurality of musical tone waveform samples that are generated together. Within the time, the ratio of the calculation time spent for the preparation processing is reduced, and the overhead can be reduced. Therefore, it is possible to improve the quality of the generated tone waveform sample and increase the number of simultaneous sounds. Note that one section between the calculation times (corresponding to the size of the output buffer) is further divided into n equal parts, sound waveform calculations are performed at time intervals corresponding thereto, and the one section completed by the last n-th calculation is performed. The reproduction unit (D
MA) 9 may be read.

Next, a description will be given of a musical sound generation method according to a second embodiment of the present invention. According to the musical sound generation method of the second embodiment of the present invention, a plurality of musical sound waveform samples are collected in a musical sound generation process of each sounding channel in which the CPU 1 executes an application program for generating a musical sound, as in the first embodiment. In addition, the input data, in this example, the MIDI event is the MID
Each time it is received by the I-interface 5, the sound waveform calculation up to that point is performed. And
At a predetermined calculation time, a tone waveform calculation is performed for only uncalculated tone waveform samples among a plurality of predetermined tone waveform samples (samples for one output buffer).

In each sounding waveform calculation, a calculation is performed for a sounding channel that is sounding. A key-on event or a key-off event (pitch bend, volume change) in which the sounding mode changes according to the input data therein. For example, a sound channel having a certain number of operations requires more arithmetic processing than a sound channel that continues sounding without changing the correspondence. In this case, if the calculation time is set at regular intervals, when the input data increases, the calculation time is occupied by the sounding channels whose sounding modes change, and as a result, the number of sounding channels that can be calculated decreases. Will be. In particular, a sounding channel for starting sounding requires many initial setting processes such as an address counter, initial setting of various envelope generators, and generation of an F number, which requires a long calculation processing time.

The second embodiment will be further described with reference to a timing chart shown in FIG. 12. The output buffer has the double buffer configuration described above.
The two output buffers are designated as A and B, and their read timings are shown in FIG. The times required for reproducing the buffers A and B are T _A and T _B, and T _A = T _B. First, in the time range t _{0 to} t ₁ to be calculated for the output buffer A,
Upon reception of the MIDI event are two MIDI reception section at time t _a as shown in FIG. 6 (a), the processing by the sound source driver section as shown in FIG. 5 (b) is carried out further drawing (c)
Tone waveform samples A ₁ between t ₀ ~t _a is calculated by the tone generator section as shown in.

It should be noted that the MIDI receiving unit receives the input MID.
It includes a MIDI interface 5 for receiving the I event, and writes the data of the MIDI event together with the occurrence time to the input buffer as described above. The tone generator driver receives the data in the input buffer or the input from the personal computer keyboard 6, and converts the voicing parameters into tone parameters according to the tone channel assignment and the input. Further, the sound source section receives the sound source parameters, processes the waveform data, and generates musical tone waveform samples that actually sound. The LPF section removes aliasing noise components in the generated musical tone waveform sample. And LPF
The output of the unit is written to output buffers A and B. In addition,
The tone generator drive, tone generator, and LPF are functions realized by the CPU 1 executing an application program.

[0030] Then, when the MIDI event at time time t _b is received in one MIDI reception section, similar processing by the sound source driver unit is performed further t _a the tone generator
Tone waveform samples A ₂ between ~t _b are calculated. Then, the tone waveform samples A ₃ between t _b ~t ₁ is calculated by the sound source unit reaches the time t _1. In this case, the time t
_a, the key-on event is input at t _b, it is processing at time t ₁ including its sound initial processing. Further, the LPF unit performs the filtering process, and the generation of the tone waveform sample for the output buffer A is completed.

Next, in the time range t _{1 to} t ₂ to be calculated for the output buffer B, the MIDI receiving unit receives three new MIDI events at time t _{c as} shown in FIG. but the sound source section so in calculating tone waveform samples a _3, the input data is placed in the input buffer until the calculated time is allocated. And the musical sound waveform sample A
_When the calculation of ( ₃ ) is completed and the filter processing of the LPF section is completed, the data in the input buffer is processed by the sound source driver section, and the tone generator section B ₁ corresponding to the input between t _{1 and} t _c by the sound source section. Is calculated. In this case, even if the calculation process is delayed, the generation time of the input data is also written in the input buffer, so that the sound generation timing is not affected.

Similarly, four new MIDI events are received during the calculation time of the musical tone waveform sample B ₁ , and this input data is also calculated after the computation of the musical tone waveform sample B ₁ is completed. As a result, the musical sound waveform sample B ₂ becomes t _c to t _d
Becomes the corresponding tone waveform samples to the input of between, the tone waveform samples B ₃ becomes tone waveform samples corresponding to the input between t _d ~t _e, tone waveform samples B ₄ is corresponding to the input received during a period t _e ~t ₂ It becomes a musical sound waveform sample. Furthermore, tone waveform samples A ₅ are a tone waveform samples corresponding to the input received during a t ₂ ~t _3.

As described above, in the second embodiment, when input data is generated, the sound waveform calculation up to that time is executed at that time, so that the calculation time of the musical tone waveform sample is dispersed. . Therefore, since the processing in the calculation time performed every predetermined time does not increase, even if a large amount of input data that changes the sound generation mode such as a key-on event is generated, it is possible to prevent a problem such as a decrease in the number of simultaneous sounds. be able to.

Next, a description will be given of a musical tone waveform generating method according to a third embodiment of the present invention. By the way, when a calculation time is generated at a predetermined timing and a predetermined number of musical tone waveform samples are collectively calculated and generated, in order to generate musical tones continuously, it is necessary to generate the waveform samples generated before the generation of the previously generated waveform samples. Need to supply the predetermined number of waveform samples that follow. Then, when the number of sounding channels to be processed is large and the amount of calculation of the sounding waveform is too large, if the calculation for all the channels is executed, the supply of the musical tone waveform samples cannot be made in time and the sound is interrupted.

The tone waveform generating method according to the third embodiment is intended to solve this drawback. It is determined whether or not the supply of the tone waveform sample is in time for the conversion timing of the DAC 10. If determined,
Select a sound channel to mute from sound channels with low importance. Then, for the selected sounding channel, at the time of calculation, only the dump waveform sample corresponding to the initial period of the predetermined number of waveform samples is calculated in a short time. As described above, since a short-term dump waveform is not calculated for the musical tone waveform sample in the selected tone generation channel to be silenced, the calculation time of this tone generation channel is shortened, and the supply of the tone waveform sample as a whole is performed by the DAC.
10 conversion timings can be met.

The important sounds are: (1) a sound with a large volume at that time. (2) Attack part The sound that has just started sounding during playback. (3) The lowest sound (bass sound) when a plurality of part sounds are played. (4) The highest sound (lead sound) when a plurality of parts are played. (5) Solo part sound when a plurality of part sounds are played. In general,

A description will now be given of a modification of the third embodiment. The sounding channels to be calculated are ranked in order from the important sound prior to the sound waveform calculation, and the sounding calculation is performed in order from the important sound in accordance with the order. When the calculation of the sound waveform cannot be made in time, the calculation of the sound waveform is terminated halfway, and the sound is generated only by the musical tone waveform samples generated up to that point. If you do this,
Even if it is necessary to terminate the operation, the channel whose sound is extinguished is a channel that generates a musical tone of low importance and relatively little effect. Note that, in the third embodiment and its modifications, a sounding waveform calculation may be performed each time input data is generated.

Furthermore, the calculation of the sound waveform may not be performed every time the input data is generated, but may be calculated for one section at the end. In this case, it is preferable to trigger so that the calculation time is advanced according to the number of input data. Alternatively, one section between the calculation times is further divided into n equal parts, and sound waveform calculations are performed at corresponding time intervals,
The reproduction unit (DMA) 9 may read the tone waveform samples for one section completed by the last n-th calculation as a unit.

When a calculation time is generated at a predetermined timing and a plurality of musical tone waveform samples are collectively calculated and generated, or when a tone generation waveform calculation is performed each time input data is generated, a musical tone is continuously generated. In order to generate the waveform sample, it is necessary to supply the subsequent waveform sample before the generation of the previously generated waveform sample is completed. Then, the supply of the musical tone waveform sample is performed because the number of sounding channels to be processed is too large and the amount of calculation of the sounding waveform is too large, or time is spent for processing other than the tone generation processing (sequencer processing, etc.). If not, there is a possibility that the musical tone waveform sample being processed is read out and noise is generated. Therefore, the tone generation method according to the fourth embodiment of the present invention solves this as follows.

In the fourth embodiment of the present invention, the CPU 1 issues an instruction to the reproduction unit (DMA) 9 to pass the data of the output buffer. In this case, the address of the output buffer itself for storing the generated predetermined number of musical tone samples can be set to 9 in the reproducing unit as one reading section, or can be set as a repeated reading section to be repeatedly read. In addition, it is possible to set a read section reservation so that the address can be read following the read section that is already being read. In the present embodiment, by the reservation of the reading section, the reservation registration is performed in the output buffer after the musical tone waveform calculation sample is generated, and the reading is performed following the waveform that is already being read. If the calculation of the musical tone waveform sample is not completed, the reservation registration is not performed, so that it is possible to prevent generation of noise due to generation of the musical tone waveform sample being processed.

In this case, the sound generation is temporarily interrupted, but if the time during which the sound is interrupted is limited to several sample times at a sample frequency of 44.1 kHz, the effect is small. In order to reduce the sampling time to several sample times, the number of sounded channels may be controlled as described above. Further, when the processing is completed, a reservation is registered and sound is generated. Note that the sound waveform calculation may not be performed every time the input data is generated, but may be calculated for one section at the end. In this case, it is preferable to trigger so that the calculation time is advanced according to the number of input data.
Alternatively, one section between the calculation times is further divided into n equal parts, and a sound waveform calculation is performed at a time interval corresponding to the same, and a tone waveform sample for one section completed by the last n-th calculation is reserved. You may do so.

As described above, when a calculation time is generated at a predetermined timing and a plurality of musical tone waveform samples are collectively calculated and generated, or when a sound waveform calculation is performed every time input data is generated, continuous In order to generate a musical tone, it is necessary to supply subsequent waveform samples before the generation of the previously generated waveform samples is completed. By the way, as the calculation time, a time required for executing the generation of the sound waveform, which is earlier than the end timing, is designated based on the end timing of the musical tone waveform sample generated in the past. Since the CPU 1 checks the state (flag) of the reproduction unit (DMA) 9 to detect that the reproduction section of the musical tone waveform sample has shifted to the next section, the end timing is detected. CPU after the state (flag) of (DMA) 9 changes
There will be a time delay before 1 detects this. Further, since this time delay depends on the timing at which the CPU 1 executes the above-described detection, the time delay becomes uneven according to the timing.

If the calculation time is generated based on the timing at which the uneven time delay occurs, an accurate calculation time cannot be generated. In particular, when a timing that is greatly delayed by one time is detected, the calculation time generated based on the detection is short in the calculation time from the calculation start time to the supply of the sounding waveform. It will be reduced. Thus, the tone generation method according to the fifth embodiment of the present invention solves this as follows.

The CPU 1 stores a plurality of times at which a state change of the reproducing unit (DMA) 9 has been detected in the past. The next detection time is predicted by taking the average between the times. Since the predicted time is obtained by averaging detection delays from the true end timing in the reproducing unit (DMA) 9, a timing that is a predetermined time before the predicted timing is changed to an almost accurate end timing. Can be detected as Then, a calculation time is generated based on the end timing. In this way, the detected end timing is averaged, and the variation is reduced, so that the calculation time secured at each calculation time is also uniformed, and a stable musical sound generation operation is performed.

It should be noted that the tone waveform calculation may not be performed every time the input data is generated, but the tone waveform calculation may be performed for one section at the end. In this case, it is preferable to trigger so that the calculation time is advanced according to the number of input data. Alternatively, one section between the calculation times is further divided into n equal parts, and a sound waveform calculation is performed at a time interval corresponding to the same, and a tone waveform sample for one section completed by the last n-th calculation is reserved. You may do so.

Next, the operation of the musical tone generating method and apparatus which combine the elements of the first to fifth embodiments of the present invention will be described with reference to flowcharts. FIG. 6 is a flowchart showing the main routine. When the main routine is started, initialization is performed in step S10. In the initial setting, setting of the timer 4 and DMA, clearing of all tone generation channels, preparation of tone color data, waveform data, and the like are performed. Next, in step S20, a keyboard process for processing input from the keyboard 6 is performed, and in step S30, a process corresponding to the input MIDI event is performed.
DI processing is performed. Further, in step S40, a sound source process for performing a sound waveform calculation or the like for generating a musical tone waveform sample is performed. In step S50, other processes are performed. The process returns to step S20, and the processes in steps S20 to S50 are performed. It is repeated in a loop (steady loop). These processes are executed simultaneously with other software using a multitasking method.

Next, FIG. 7 shows a flowchart of the MIDI reception interrupt processing executed by the CPU 1. This processing is performed by M
When the IDI interface 5 receives some MIDI event from the outside, it is activated by interruption. This MI
The DI reception interrupt process is a process performed with higher priority than other processes. When the MIDI reception interrupt process is started,
In step S100, the received data received by the MIDI interface 5 is fetched, and step S11
At 0, the received data is written in the above-described input buffer in a format as shown in FIG. 3 in combination with the time data at the time of reception, and the process returns to the process when an interrupt occurs. Thus, the received MIDI data is sequentially written into the input buffer together with the reception time.

Next, FIG. 8 shows a detailed flowchart of the MIDI processing executed as step S30 in the regular loop of the main routine. When the MIDI process is started, the process goes to step S200 to read the input buffer and confirms whether there is unprocessed received data. If it is determined in step S210 that there is unprocessed received data,
Proceeding to step S220, branching is performed according to the content of the received data. If the received data is a note-on event,
The flow branches to step S230 to execute note-on processing. If the received data is note-off, the process branches to step S240 to execute a note-off process. If the received data is other data, the process proceeds to step S250.
And the other processing is executed. Then, when any of these processes ends, the MIDI process ends. If it is determined in step S210 that there is no received data, the MIDI processing ends.

Next, in the above-mentioned MIDI processing, if the received data is a note-on event, step S23 is executed.
FIG. 9A shows a flowchart of the note-on process executed at 0. When the note-on process is started, in step S300, the note number of the note-on event in the input buffer is set to NN, and the velocity is set to VE.
Each of them is taken into the register as L, and the occurrence time of the note-on event is taken into the register as TM. Next, in step S310, a tone assignment process of the note number NN taken into the register is performed, and the number of the assigned channel (ch) is taken into the register as i.

Further, in step S320, of the ch registers shown in FIG.
The tone register control data corresponding to the note number NN and the velocity VEL is set in the ch register of. The tone control data to be set includes tone data (various ODs) corresponding to the MIDI channel that has received the note-on event, out of the tone data for the 16 tone colors shown in FIG. 2, and the values of the note number NN and the velocity VEL. Is sounding data (various D) obtained by processing according to. Here, the waveform designation data D in the tone generation data is obtained by referring to the tone range waveform designation data in the timbre data shown in FIG. 2 using the note number NN, and is used for generating a tone corresponding to the note number NN. Waveform data WD
1 to one of the waveform data WDn. After setting the tone control data, a note-on flag of ich is set in step S330.

Next, in step S340, the calculation of the sound generation waveform is performed. In this case, the calculation is performed at time TM among all the waveforms to be written in the buffer X currently being prepared.
The previously executed and uncalculated waveform (partial waveform) is executed, and the calculated partial waveform is written to the output buffer X. Here, the partial waveform is determined in step S210.
At the time when new received data is detected (data is determined) and corresponds to a sound generation waveform in a range in which calculation and generation can be performed. The generated waveform is a sounding waveform up to the time of the received note-on event occurrence time TM, and the tone waveform that starts sounding in response to the note-on is not included in the sounding waveform, but is a sounding waveform generated thereafter. It is included in the one. The details of this processing are shown in FIG. 11 described later.

This step S340 and step S3
Process 50 is corresponds to the calculation process of generating ₂ such tone waveform A ₁ or A described in connection with FIG. 12 above, at step S350, the tone of ich set in ch register at step S320 described above Based on the control data,
The initial setting of the sound generation in the ich is performed for the work area of the ch register. Here, the work area stores a plurality of data current values necessary for generating a waveform of each channel, such as an address current value, various envelope current values and current states, and an LFO waveform current value necessary for generating a tone for each sounding channel. Remember. When the sound generation initial process ends, the note-on process ends. In the initial setting, the start address is set to the current value of the waveform read address, the F number is generated according to the note number NN, and the LFO,
Initial settings such as a filter EG, a volume EG, an interpolation calculation, and a filter calculation are performed. This initial setting is a process that requires a calculation time as described above.

Next, in the above-mentioned MIDI processing, if the received data is a note-off event, step S24
FIG. 9B shows a flowchart of the note-off process executed at 0. When the note-off process is started, in step S400, the note number of the note-off event in the input buffer is taken into the register as NN, and the occurrence time of the note-off event is taken as TM in the register. Next, in step S410, the sound channel (ch) sounded with the note number NN.
Is searched, and the number of the found pronunciation ch is taken into the register as i.

Next, in step S420, the note-on flag of ich is defeated, and in step S430, calculation and generation of a tone generation waveform are executed. The operation generation processing in this case is the same processing as that in step S340 described above, and the time TM
The previous uncalculated waveform (partial waveform) is calculated and written to the output buffer X. Further, in step S440, the ich release start process is performed, and the note-off process ends. Here, the release start process of ich is
This is a process of rewriting the state and the like of various envelopes of the ich in the work area and changing the state of musical tone generation in the ich to the release state.

Next, a detailed flowchart of the sound source processing executed as step S40 in the steady loop of the main routine will be described with reference to FIG. When the sound source processing is started, the playback state of the playback unit (DMA) 9 is checked in step S500. If the playback section has advanced to the next step, the process proceeds to step S510. If the playback section has not advanced, the process proceeds to step S520. . The DMA 9 uses a waveform sample of a specific area on the RAM 3 specified by the CPU 1 as a reproduction area, sequentially reads out one sample from the first sample of the specific area at a predetermined sampling cycle, and supplies it to the DAC 10 for reproduction. Further, the DMA 9 receives a reservation for designating another area to be reproduced next from the CPU 1 while reproducing the specific area. After the reproduction of the specified specific area being reproduced is completed, the reserved waveform samples are successively read out one by one by the DMA 9 and supplied to the DAC 10 for reproduction. Here, that the reproduction section advances next means that the reproduction of the reproduction section previously specified as the specific area has been completed and the reproduction has shifted to another reproduction section reserved as the next specific area. Note that a plurality of specific areas can be reserved for reproduction at a time. In this case, the plurality of specific areas are sequentially reproduced in the order of reservation.

In step S510, the next detection time is predicted from the time at which the current progress is detected (current time) and the time detected in the past, and the time that is a predetermined time before the predicted detection time is calculated as the next calculation time. Specify as As a method of predicting the next detection time, a method of obtaining an approximate value with a small error by the least squares method based on a plurality of detection times including the current time and the past detection time and predicting the same is used. There is a method of estimating the state of change by approximating it with another function such as a quadratic function. In the DMA 9, the time from the occurrence of the progress to the detection in the step S <b> 510 has an irregular time lag due to the processing step position at each time, the difference in the situation, and the like, and the non-uniform variation occurs in a plurality of detection times. It is included. Therefore, the calculation of the approximation function includes a process of averaging a plurality of variations in detection time.

The predetermined time is a time secured for generating a musical tone waveform. The length of the predetermined time depends on the amount of calculation required for generating the calculation, such as the number of sounds to be secured, the quality of the calculation, and the like. It is determined based on. The length of the predetermined time may be a fixed value, but may be set by the keyboard 6 or may be automatically determined by the CPU 1 in consideration of a plurality of processing programs running simultaneously.

Next, in step S520, by comparing the next calculation time with the current time indicated by the timer 4, it is determined whether or not the calculation time has been reached, and it is determined that the calculation time has been reached. In this case, the processing from step S530 to step S580 is executed. First, step S530
Determines in which order the currently sounding sounding channel is to be calculated. In the waveform calculation generation processing in step S550 described later, a sounding waveform for a plurality of samples is generated for each channel that is sounding, and the processing order of the channels at that time is determined here. is there.

Here, according to the method of the third embodiment described above, the musical tones that are important in terms of music, and the musical tones that should not be erased, are ordered in order so as to perform calculations in order. Next, in step S540, it is determined whether or not all the sounding channels that are sounding can be calculated within a predetermined calculation time (the predetermined time described in step S510). , One or a plurality of sounding channels to be muted are designated, and the calculation amount is reduced so that the calculation can be performed within a predetermined calculation time.
This process is a specific process based on the tone generation method of the third embodiment. Next, step S55
At 0, the calculation of the sound waveform is performed. Here, the tone waveform sample is calculated for the uncalculated portion of the buffer X, the tone waveform is calculated, and written to the output buffer X so that the currently prepared output buffer X is filled with the tone waveform data and is ready. It is. This process corresponds to the calculation process of generating such sound waveform A ₃ described in connection with FIG. 12 above.

Each sample of the buffer X which has been filled with the sound generation waveform and is ready is further subjected to a low-pass filter (LPF) process in step S560 to cut high-frequency components. Next, in step S570, the area of the output buffer X for storing the tone generation waveform after LPF processing is reserved and registered in the waveform reproduction unit (DMA) 9 as a specific area for storing the reproduction waveform to be subsequently reproduced. As a result, it is reserved so that the sound waveforms of the specific area currently being reproduced and the specific area already reserved are reproduced after the reproduction is completed. Then, in step S580, a new output buffer area different from the output buffer previously used as the buffer X is secured, all the sample values are cleared to zero, and a tone waveform in the next section is created. Then, a new output buffer X is prepared for the preparation, and the sound source processing ends. If it is determined in step S520 that the time has not reached the calculation time, the process ends.

Next, FIG. 11 shows a flowchart of the sound waveform calculation processing executed in the note-on processing, the note-off processing and the tone generator processing. When this process is performed, the time range of the sound waveform from which the sound waveform is calculated is determined in advance as described above. That is, when the present flow is executed as a process at the time of receiving MIDI data such as a note-on process, the time range is the partial waveform described above. Is a sound waveform sample of an uncalculated portion of all the samples. At the time of receiving the MIDI data, the calculation is performed based on the calculation order determined in the immediately preceding sound source processing. Therefore, the calculation order of the tone generation channels is not newly determined. If there is a new note-on, the order of all other sounding channels is moved down by one, and the new note-on channel is sequentially added to the first in the calculation order.

When the sounding waveform calculation processing is started, in step S600, the first sounding channel (c
h) The first musical tone waveform sample is prepared for calculation.
The operation preparation processing includes the previous read address, various EG
This is a process for preparing access to data such as values, states of various EGs (states of attack and release, etc.), LFO values, and the like, and loading them into internal registers of the CPU 1 so that they can be used immediately for calculations. Then, step S6
At 10, waveform calculations of the LFO, the filter G, and the volume EG are performed, and samples of the LFO waveform, the FEG waveform, and the AEG waveform necessary for the calculation of the designated time range are generated. L
The FO waveform is added to the F number, FEG waveform, and AEG waveform, and modulates each data. In addition, with respect to the sound generation channel designated as the channel to be silenced in step S540, an AEG waveform for a dump that rapidly attenuates within the above range is calculated and generated as the volume EG.

Next, in step S620, the F number is repeatedly added with the previous read address as an initial value to generate a read address for each sample within the time range. And read out the waveform samples from the waveform storage area WD, and perform interpolation between the read waveform samples based on the decimal part of the read address to calculate all the interpolated samples within the time range. For example, if the time range corresponds to the time for 100 samples,
The processing is performed by this step for 100 samples at a time. Here, in the processing for a plurality of samples within the time range, the addition of the F number to the read address and the processing from reading based on the address generated by the addition to the interpolation processing are unit processing, and this unit processing is repeated. Therefore, the reading of the read address into the CPU register only needs to be performed once as a whole, and the processing speed is increased.

Further, in step S630, timbre filter processing is performed on the interpolated samples within the time range.
Tone control is performed based on the FEG waveform, and in step S640, amplitude control processing is performed on the sample within the time range that has been subjected to the filter processing, and amplitude control of the tone waveform sample is performed based on the AEG and the volume data. Is performed, and an accumulation writing process is performed in which the tone waveform samples for the time range subjected to the amplitude control process are added to the corresponding samples in the output buffer X, respectively. In this process, for each sample within the time range,
Since the amplitude control and the addition of the buffer X to the corresponding sample are performed continuously, the number of samples to be taken into the CPU register can be reduced, and the processing speed is improved.

As described above, the processing for generating the musical tone waveform samples from step S620 to step S640 is basically performed so as to generate all the samples within the predetermined time range.
As a result of the waveform calculation of the volume EG at 0, the range in which the level of the AEG waveform is lowered and the volume is sufficiently attenuated is excluded from the calculation, and the processing is reduced accordingly. In particular, regarding the sounding channel for which the AEG waveform for dump has been generated according to the instruction in step S540,
In many cases, sufficient attenuation is obtained in the middle of the predetermined time range.

Then, in step S650, if it is desired to continue the waveform calculation processing as it is, it is determined whether or not the waveform can be supplied to the DMA 9 within the time limit, and it is determined whether or not to stop the calculation. Here, supplying the waveform within the time limit means that the DMA 9 which is reproducing the specific area storing the previously generated sound generation waveform continues to the buffer X before the reproduction of the area ends. That is, a tone generation waveform is prepared, and the area of the buffer X can be reserved for reproduction. If it is not enough to continue the process, it is determined that the calculation is to be terminated. In step S670, the termination process is executed, and the sound waveform calculation process ends.

If it is determined that it is safe to continue the calculation, it is determined that it is not necessary to terminate the calculation, and in step S660, the generation of the musical tone waveforms for all the sounding channels to be calculated has been completed. If it is determined that the calculation has not been completed for all sounding channels, the first tone waveform sample of the sounding channel assigned the next calculation order is designated in step S680, and the next sounding channel is specified. Preparation for calculation and generation of the musical tone waveform of the musical tone channel of FIG. When the preparation is completed, the process returns to step S610, and the tone generation process from step S610 to step S640 is executed for the sound channel in the same manner as described above. In this manner, the processing from step S610 to step S660 is repeatedly performed until the calculation for all the tone generation channels is completed. For each process of each sounding channel, the generated samples for the predetermined time range are sequentially added to the corresponding samples of the buffer X in step S640.

If it is determined in step S660 that the calculation generation processing has been completed, the main sound generation waveform calculation ends. At this time, an accumulated value obtained by accumulating the generated tone waveform samples of all tone generation channels to be calculated is newly stored in the buffer X for the number of samples corresponding to the time range. On the other hand, if it is determined in step S650 that the sound generation is to be discontinued, and the sound generation waveform calculation is completed through the cutoff processing in step S670, the calculation generation has been completed in the buffer X by that time among all the sound generation channels to be calculated. The cumulative value of the tone waveform sample for the pronunciation channel is
The number of samples corresponding to the time range is newly stored.

For the sounding channels to which the calculation order after the truncation has been assigned, no musical tone operation is generated, and as a result, the musical tones of the channel disappear, but they disappear by the processing in step S530. In such a case, the lower the influence, the later the calculation order, so that the adverse effect due to the truncation can be minimized. In the termination process of step S670, the ch register is set so that the channel that cannot be calculated once remains muted in the next and subsequent sound generation waveform calculations.

The above-described sound waveform calculation processing is performed as shown in FIG.
In the case where the sound generation waveform calculation process described above is completed in step S340 of the note-on process shown in the flowchart of FIG.
The process of 350 is continuously executed, and the note-on process ends. When the sounding waveform calculation processing is executed in step S430 of the note-off processing shown in the flowchart of FIG. 9B, when the above-described sounding waveform calculation processing ends, the processing of step S440 in the flowchart is continued. And the note-off process ends.

Further, when the sound waveform calculation processing is executed in step S550 of the sound source processing shown in the flowchart of FIG. 10, when the above sound waveform calculation processing is completed, the processing from step S560 of the flowchart is continued. When the processing in step S580 ends, the sound source processing ends. These note-on processing, note-off processing, and sound source processing are repeatedly performed repeatedly in a stationary loop shown in FIG. 6, so that musical tone waveform samples to be generated are sequentially generated.

Needless to say, in the musical tone generating method of the present invention, for example, a step of instructing the generation of a plurality of musical tones and a step of instructing the start of calculation at a predetermined time interval are performed. Regarding the step of handling independent data, it is not necessary to perform the processing in the order described above, and the processing order may be changed and executed. In the musical sound generation method of the present invention,
A process including a sounding instruction requested by another application software can be performed using the idle time of the above-described musical tone generation calculation process. Other application software includes game software, communication software, business processing software, and the like.

In the above, the tone generating method of the present invention has been described as a program executed by the tone generating apparatus shown in FIG. In addition, the musical sound generation method of the present invention includes:
One application program may be executed in parallel with another application program on a general-purpose computer that runs Windows (OS for a personal computer of Microsoft Corporation in the United States) or another operating system.

[0074]

Since the present invention is constructed as described above, the preparation process for each tone generation channel only needs to be performed once for the calculation of a plurality of musical tone waveform samples, and the overhead can be reduced. . Therefore, the quality of the generated musical sound can be improved, and the number of simultaneously sounding channels can be increased. Further, if the calculation of the musical tone waveform sample is performed every time a MIDI event is input, the calculations are dispersed, and the number of sounds generated by the sound generation initial process can be prevented from being reduced.

Further, when performance information is generated, processing for receiving performance information is performed, and tone control or waveform generation based on the received performance information is included in the main step executed during the idle time of the reception processing. Therefore, an increase in the processing at the time when the performance information is generated can be dispersed within the free time, and a temporary increase in the processing can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a musical sound generation device capable of executing a musical sound generation method of the present invention.

FIG. 2 is a diagram showing a tone color data area on a RAM.

FIG. 3 is a diagram showing an input buffer area on a RAM.

FIG. 4 is a diagram showing a ch register area on a RAM.

FIG. 5 is a diagram showing an output buffer area on a RAM.

FIG. 6 is a diagram showing a flowchart of a main routine of the musical sound generation method of the present invention.

FIG. 7 is a diagram showing a flowchart of MIDI reception interrupt processing of the musical sound generation method of the present invention.

FIG. 8 is a diagram showing a flowchart of a MIDI process in a main routine.

FIG. 9 is a diagram showing a flowchart of a note-on process and a note-off process in the MIDI process.

FIG. 10 is a diagram showing a flowchart of a sound source process in a main routine.

FIG. 11 is a diagram showing a flowchart of a tone generation waveform calculation process in the tone generation method of the present invention.

FIG. 12 is a diagram showing a timing chart according to the second embodiment of the present invention.

[Explanation of symbols]

1 CPU, 2 ROM, 3 RAM, 4 timer, 5
MIDI interface, 6 keyboard, 7 display, 8 hard disk, 9 playback unit, 10
DAC, 11 sound system

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-58291 (JP, A) JP-A-4-155396 (JP, A) JP-A-2-179692 (JP, A) JP-A-62-1987 9395 (JP, A) JP-A-60-33600 (JP, A) Hal Chamberlin, "Musical Applications of Microprocessors" SECOND EDITION, (1987), Hayden Books AW Division. Sams S Co. (58) Field surveyed (Int. Cl. ⁷ , DB name) G10H 1/02-1/16 G10H 1/18-1/18 101 G10H ⁷ /00-7/12

Claims (9)

(57) [Claims] 1. A generation instruction for generating a specified sound.
A first step of issuing, assign the designated sound in one of a plurality of tone generation channels
Of the designated sound corresponding to the assigned channel.
A second step of storing control data in a register, a third step of issuing an operation start instruction at a predetermined time interval, and a control stored in the register according to each operation start instruction.
Multiple waveform data for each channel based on
Each of the above channels so that the
A fourth step of performing a sound generation operation on the panel ,
This sound generation calculation is performed for the samples of the plurality of samples to be generated.
Is performed within a time shorter than the total
And sample the waveform data generated on each channel.
Mix at each sample point and mix at each sample point.
A fifth step of generating pull data, and the mixed sample of the sample points sequentially at each sampling period.
; And a sixth step of sequentially outputting a pull data
A sound generation method characterized by doing so . 2. A method according to claim 1, wherein said first instruction is performed in response to each of said generated instructions.
A first halfway operation start instruction issuance step for issuing a calculation start instruction , wherein the fourth step includes the step of:
Issuance of a calculation start instruction at a predetermined time interval and the first halfway
First intermediate operation start command by operation start instruction issue step
Command from the end of the generated waveform data
The operation start instruction or the first intermediate operation start instruction
2. The sound generation method according to claim 1, wherein waveform data of a plurality of samples corresponding to the section up to the point of issuance is generated. 3. An operation start instruction is issued in the third step.
The time interval to be executed is divided into a plurality of
Second intermediate operation that issues a second intermediate operation start instruction at intervals
A start instruction issuing step, wherein in the fourth step, the second intermediate calculation start is started.
Generate waveform data of multiple samples in response to instruction issuance
The sound generation method according to claim 1, wherein 4. A generation instruction for generating a plurality of designated musical tones.
The first step of issuing a command, and each designated musical tone is designated from a plurality of sounding channels.
Assigned to one of the sound channels to control the specified tone
Control data for each specified sound channel.
A second step of writing and storing the data in a register, and a third step of issuing an operation start instruction at predetermined time intervals
According to each operation start instruction issued in the third step.
And stored in the channel register of the channel.
Based on the control data, multiple
A fourth process for arithmetically generating waveform data for several samples
And step, per the fourth sound channel specified in step
The generated waveform data is mixed for each sample,
Generate mixed sample data for each of multiple samples
And a fifth step of combining the sample data of the plurality of samples.
6th step to convert to analog signal at every clock cycle
And in the fourth step, a larger channel than the other channels
At least one channel generating a musical tone having a volume
Arithmetic operation of waveform data according to the specified conditions that prioritize
Tone generating method being characterized in that to perform the generative. 5. Generating one or more specified musical tones
A first step of receiving one or more generating instructions for generating a plurality of specified musical tones in response to said generating instructions.
Assigned to each one of the sound channels and the designated
Tone control data is assigned to each specified tone
Write to the channel register corresponding to each sounding channel
A second step of writing, computing a third step of determining the importance of the musical tone to be generated in each tone generation channel, and a fourth step of sequentially issuing the operation start instruction, which is issued by the fourth step For each of the start instructions
In response, the control data stored in the channel register
Important based on the data and determined in the third step
Any number of said plurality of sounding channels according to degree
A fifth step of generating waveform data of a plurality samples per channel, are generated for each sound channel by said fifth step
The waveform data for each channel is
Mixing each sample to generate mixed sample data .
Tone generating method characterized by comprising of the steps. 6. Generating one or more specified musical tones
A first step of receiving one or more generation instructions for generating the specified musical tone in response to the generation instruction.
Assign to the specified sound channel from the sound channel
Control data of the specified musical tone.
Channel corresponding to the sound channel to which the assigned tone is assigned.
A second step of writing to a channel register, a third step of sequentially issuing an operation start instruction, and a channel of the channel in response to each operation start instruction.
Each sound channel based on the control data stored in the
Calculation to generate waveform data for multiple samples for each channel
And a fourth step of generating for each sounding channel in the fourth step.
Mixed waveform data for each of the plurality of samples.
5th step of generating mixed sample data
And the operation for all the specified sounding channels
Is determined not to be completed within a given time period
The waveform data for at least one sound channel.
A sixth step of issuing an instruction to change data generation;
A music sound generating method comprising : 7. Generating one or more specified musical tones
A first step of receiving one or more generated instructions for
And a plurality of specified sounds in response to the generation command.
Assigned to each one of the sound channels and the designated
Tone control data is assigned to each specified tone
Write to the channel register corresponding to each sounding channel
And a third step of sequentially issuing an operation start instruction, and in response to each operation start instruction,
Each sound channel based on the control data stored in the
Fourth generation of waveform data for multiple samples for each channel
A step of, are generated for each sound channel by the fourth step
Mixed waveform data for each of the plurality of samples.
5th step of generating mixed sample data
Wherein the fourth step is performed within a specific time period.
Which pronunciation channel can generate waveform data
To the sounding channel determined to be possible
The generation of the waveform data only for the
Musical tone generation method. 8. Generating one or more specified musical tones
A first step of receiving one or more generated instructions for
And a plurality of specified sounds in response to the generation command.
Assigned to each one of the sound channels and the designated
Tone control data is assigned to each specified tone
Write to the channel register corresponding to each sounding channel
And a third step of sequentially issuing an operation start instruction, and in response to each operation start instruction,
Each sound channel based on the control data stored in the
Fourth generation of waveform data for multiple samples for each channel
A step of, are generated for each sound channel by the fourth step
Mixed waveform data for each of the plurality of samples.
5th step of generating mixed sample data
And the fourth step includes the steps of:
Of each sounding channel according to the predetermined
Performs an operation to generate waveform data for multiple samples,
Further, the execution of the waveform data generation calculation in the fourth step is performed.
During the row, it was determined that the operation was not completed within a predetermined time
In the remaining time of the predetermined time, the waveform data generation calculation
Tone generation method characterized by not executing
Law. 9. A generation order for generating a plurality of designated musical tones.
The first step of issuing a command, and each designated musical tone is designated from a plurality of sounding channels.
Assigned to one of the sound channels to control the specified tone
Control data for each specified sound channel.
A second step of writing and storing in a register, and the importance of musical tones generated in the specified sounding channel
The order of calculation for each specified sound channel.
And a fourth step of issuing an operation start instruction at predetermined time intervals.
And the operation start instruction issued in the fourth step.
The channel register of the specified sound channel.
Data for multiple samples based on the control data stored in the
A fifth step of arithmetically generating shape data; and generating the shape data in each of the channels for each of the plurality of samples.
The generated waveform data is mixed and mixed for multiple samples.
A sixth step of generating sample data, and combining the sample data of the plurality of samples with a sampler.
7th step to convert to analog signal at every clock cycle
In the fifth step, the third step
Each specified pronunciation channel according to the determined operation order.
Performs tone generation for each channel, and
And converted in the seventh step
If the analog signal may be interrupted,
At the time of the sounding channel in the middle of the calculation order
The analog signal is not interrupted
A method for generating a musical tone, characterized in that: