JP2003108142A - Musical sound generating device and program for musical sound generation processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need to repeatedly store parameters for generating envelope data and to eliminate the need to repeatedly process the same envelope data even in stereophonic mode, and to secure timbres as many as sounding channels even in monaural mode. SOLUTION: A CPU 1 generates waveform forming data corresponding respective musical sound waveform data when a sounding mode is set to the monaural mode, and generates waveform forming data corresponding to only one of a couple of pieces of musical sound waveform data constituting a stereophonic sound and also duplicates the waveform forming data corresponding to the one musical sound forming data as waveform forming data corresponding to the other musical sound waveform data when the sounding mode is set to the stereoscopic mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone generating device and a musical tone generating processing program, and more particularly to a musical tone generating device and a musical tone generating processing program for generating musical tones by a plurality of tone generation channels.

[0002]

2. Description of the Related Art When a musical tone is generated by a plurality of tone generation channels, each tone waveform data to be assigned to each tone generation channel is generated according to the event data by the performance operation or the event data from the outside. For example,
When the musical tone waveform data is generated based on the musical tone waveform PCM data stored in advance in the memory, the pitch envelope data corresponding to the event data is calculated by a calculation process, and the read speed controlled by the calculated pitch envelope data. The PCM data corresponding to each tone generation channel is read out to generate musical tone waveform data. further,
Control data such as filter envelope data and amplifier envelope data for each tone waveform data is calculated by arithmetic processing, and the corresponding tone waveform data is controlled by the calculated control data, and then assigned to the corresponding tone generation channel.

[0003]

In the prior art, the method of producing a plurality of tone generation channels in monaural and the method of producing a plurality of tone generation channels in stereo have different configurations. In the case of a system in which multiple sounding channels are pronounced in monaural, envelope data for performing tone color control for each sounding channel is generated by arithmetic processing, so it is possible to secure as many timbres as there are sounding channels. is there. However, when the monophonic type is pronounced in the stereo mode, the envelope data is generated by the arithmetic processing for each tone generation channel, even though the same tone color control is applied to the two tone generation channels forming a pair. There is a need to. Therefore, it is necessary to duplicately store the parameters for generating the envelope data in the memory such as the ROM. In addition, the same envelope data calculation process must be performed twice in order to control the tone color for one tone color. On the other hand, in the case of a system in which a plurality of sound generation channels are sounded in stereo, since two sound generation channels to be paired for one timbre are reserved in advance, envelope data is generated in a memory such as a ROM. It is not necessary to store the parameters of the above in duplicate. Further, the calculation process for generating the envelope data for tone color control for one tone color only needs to be performed once. However, in the case of producing the sound of this stereo system in the monaural mode, only one tone generation channel among the tone generation channels forming a pair is used, so that only half the number of tone colors can be secured with respect to the number of tone generation channels.

An object of the present invention is to provide a ROM capable of sounding a plurality of sound generation channels in a monaural mode and a stereo mode even in the stereo mode.
It is not necessary to store duplicate parameters for generating envelope data in the memory such as, and to avoid duplicate arithmetic processing of the same envelope data. It is to be able to secure as many timbres as there are channels.

[0005]

According to a first aspect of the present invention, there is provided a musical tone generating apparatus comprising a mode setting means for setting a sound generation mode of a predetermined number of sound generation channels to a monaural mode or a stereo mode. 6 and CPU
Waveform data for generating a predetermined number of musical tone waveform data to be allocated to a predetermined number of sound generation channels in accordance with input event data (corresponding to the performance of the keyboard 5 in FIG. 1 in the embodiment). When the tone generation mode is set to the monaural mode by the generation means (corresponding to the CPU 1 in FIG. 1 in the embodiment) and the tone generation mode is set, the waveform shaping data corresponding to each tone waveform data is generated, When the sounding mode is set to the stereo mode by the setting means, the waveform shaping data corresponding to only one musical tone waveform data of the pair of musical tone waveform data forming the stereo is generated to correspond to the other musical tone waveform data. For the waveform shaping data to be reproduced, a shaping data generating means for duplicating the waveform shaping data corresponding to one tone waveform data (implementation (Corresponding to the CPU 1 of FIG. 1) and data shaping means for performing data shaping processing on each musical tone waveform data corresponding to the waveform shaping data generated or duplicated by the shaping data generating means (in the embodiment, , Which corresponds to the CPU 1 in FIG. 1). In this case, the waveform data generating means has a musical tone waveform P stored in advance in a predetermined storage means.
The CM data may be read at a reading speed corresponding to the event data to generate musical tone waveform data. Alternatively, the waveform data generating means may be configured to generate the musical tone waveform data by software based on the event data. Further, in each of the above cases, the shaping data generating means may be configured to generate or duplicate envelope data for performing tone color control on the tone waveform data. Further, in this case, the shaping data generating means generates or duplicates the pitch envelope data, and the data shaping means uses the pitch envelope data to generate the PCM in the waveform data generating means.
The configuration may be such that the step rate of reading data is controlled.

According to a sixth aspect of the present invention, there is provided a program for tone generation processing, comprising: a first step of setting a sound generation mode of a predetermined number of sound generation channels to a monaural mode or a stereo mode; and input event data (in the embodiment,
(Corresponding to the performance of the keyboard 5 in FIG. 1), the second step of generating a predetermined number of musical tone waveform data assigned to a predetermined number of sound generation channels, and the sound generation mode being set to the monaural mode by the first step. When the tone generation mode is set to the stereo mode in the first step, one of the pair of tone waveform data forming a stereo is generated. Third step and third step of generating waveform shaping data corresponding to only the musical tone waveform data and copying the waveform shaping data corresponding to the other musical tone waveform data to the waveform shaping data corresponding to the other musical tone waveform data. Fourth step of performing data shaping processing on each musical tone waveform data corresponding to the waveform shaping data generated or duplicated in It has a configuration with a. In addition,
In the embodiment, the above-mentioned first step to fourth step correspond to the processing function in the musical sound generation processing program executed by the CPU 1 of FIG. In this case, the second step may be configured to generate musical tone waveform data by reading musical tone waveform PCM data stored in advance in a predetermined storage unit at a reading speed according to the event data. Alternatively, the second step is
The configuration may be such that the musical tone waveform data is generated by software based on the event data. In each of the above cases, the third step may be configured to generate or duplicate envelope data for performing tone color control on the musical tone waveform data. Further, in this case, the third step produces or duplicates the pitch envelope data, and the fourth step uses the pitch envelope data to generate the PC in the second step.
You may make it the structure which controls the step speed of the reading of M data.

According to the first or sixth aspect of the invention, when the tone generation mode is set to the monaural mode, waveform shaping data corresponding to each tone waveform data is generated, and the tone generation mode is the stereo mode. When set to, waveform shaping data corresponding to only one tone waveform data of the pair of tone waveform data forming the stereo is generated, and one of the waveform shaping data corresponding to the other tone waveform data is generated. Duplicate the waveform shaping data corresponding to the tone waveform data.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a musical tone generating apparatus according to the present invention will be described below with reference to the drawings. Figure 1
It is a block diagram showing a system configuration of a musical sound generating device in an embodiment. In the figure, a CPU 1 is connected to a ROM 3, a RAM 4, a keyboard 5 and a switch 6 via a system bus 2. The ROM 3 stores a program executed by the CPU 1, initial data, and parameters for generating envelope data. RAM4 is CP
It is a work area of U1 and includes various registers and the like described later. The keyboard 5 inputs event data, such as pitch and velocity, to the CPU 1 according to the performance. The switch 6 is composed of a mode switch for setting a monaural mode or a stereo mode, a switch for setting a tone color, or the like. A D / A converter 7 is connected to the CPU 1, and an output circuit 8 is connected to the D / A converter 7.
The D / A converter 7 converts the digital musical tone signal output from the CPU 1 into an analog signal, supplies the analog signal to the output circuit 8, and outputs it to a sounding means such as an external speaker.

FIG. 2 is a block diagram showing the internal configuration of the CPU 1, which includes a control section 11, a waveform reading section 12, an envelope computing section 13, a waveform output section 14, and a waveform memory section 15.
It is composed of. The control unit 11 controls the waveform reading unit 12 to read the PCM data of the tone signal stored in advance in the waveform memory unit 15, and controls the envelope calculation unit 13 to generate the envelope data by the calculation process. Then, using the generated envelope data, RO
The parameters read from M3 are controlled, and the PCM data read from the waveform memory section 15 is subjected to tone color control by the parameters controlled by the envelope data. Next, the PCM data subjected to the tone color control is assigned to the eight sound generation channels of the waveform output section 14, and the D / A
It is sent to the converter 7. Therefore, the waveform memory unit 15
Has an area in which PCM data for 8 channels CH0 to CH7 is stored, as shown in FIG.

FIG. 4 is a diagram showing a configuration of registers and the like in the RAM 4. In the figure, MONOF is a mode flag that is "1" in monaural mode and "0" in stereo mode. N is a pointer for designating the key number of the keyboard 5. CH is a pointer that designates a channel. O
NTF (CH) is a tone generation trigger flag of a channel designated by CH, and is "1" when a key is pressed, that is, a tone generation instruction, and "0" when a tone is generated. ONF (CH) is a tone generation flag of a channel designated by CH, and is "1" in the tone generation state and "0" in the mute state. KEY (CH) is a register for storing the pitch of the channel designated by CH. OFT
F (CH) is a mute trigger flag of the channel designated by CH, and becomes "0" at the start of mute by releasing the key, that is, mute instruction.

AD is a register for storing the initial address of the waveform memory section 15. AD (CH) is a register that stores the address of the waveform memory unit 15 for the channel designated by CH. ΔAD is the waveform memory unit 15
It is a register for storing the step speed for reading out PCM data from. ΔAD (CH) is a register that stores the step speed for reading the PCM data of the channel designated by CH. F is a register that stores the filter coefficient of the envelope. F (CH) is a register that stores the filter coefficient of the channel designated by CH. A
MP is a register that stores the amplifier coefficient of the envelope. AMP (CH) is a register that stores the amplifier coefficient of the channel designated by CH. PE is a register that stores pitch envelope data. PE
(CH) is a register for storing the pitch envelope data of the channel designated by CH. FE is a register that stores the filter envelope data. F
E (CH) is a register for storing the filter envelope data of the channel designated by CH. AE is a register for storing amplifier envelope data.
AE (CH) is a register for storing the amplifier envelope data of the channel designated by CH.

OFSET is a register for storing the offset of the read address of the waveform memory section 15 in the stereo mode. RPE is a register that stores release pitch envelope data. RFE is a register that stores release filter envelope data. RAE is a register that stores release amplifier envelope data. OUT (CH) is a register that stores the output waveform data of the channel designated by CH. α is a distribution ratio of the L channel and the R channel in the stereo mode. OUTL is a register that stores the output waveform data of the L channel. OUT
R is a register for storing the output waveform data of the L channel.

Next, the operation of the tone generation processing in the embodiment will be described with reference to the flow charts of the CPU 1 shown in FIGS. Figure 5 is the main flow,
After a predetermined initialization (step A1), switch processing for detecting ON / OFF of the switch 6 (step A)
2), a keyboard process for detecting a change in key press / release of the keyboard 5 (step A3), a sounding process for controlling the sounding and muting of a musical sound (step A4), and other processes (step A5)
Is repeatedly executed. FIG. 6 is a flow of the switch process of step A2 in the main flow. It is determined whether or not the mode switch is turned on (step B1), and when this switch is turned on, MONOF is inverted (step B2). After the mode switch is detected, the other switches are processed (step B3) and the process returns to the main flow.

FIGS. 7 and 8 are flowcharts of the keyboard processing of step A3 in the main flow. In FIG. 7, first, the pointer N designating the key number is set to "0 (key number of lowest pitch)" (step C1). Then, the following loop is repeated while incrementing the value of N.
It is determined whether or not the key with the key number N has changed to on (key depression) or off (key release) (step C2). When the key with the key number N has changed to on, set "0" to CH. Set (step C3). Then, while incrementing the value of CH, the following loop of steps C4 to C13 is repeated.

At step C4, it is judged whether or not both the tone generation trigger flag ONTF (CH) and the tone generation flag ONF (CH) are "0", and if either one of the flags is "1", Since the channel designated by CH is already in the sounding instruction or sounding state, the value of CH is incremented (step C5). And MONO
It is determined whether F is "1 (monaural)" (step C6). If MONOF is "1", it is determined whether the value of CH exceeds "7" (step C).
7). On the other hand, when MONOF is "0 (stereo)", it is determined whether the value of CH exceeds "3" (step C8). If the value of CH is "7" or "3" or less in step C7 or step C8, in step C4, the tone generation trigger flag ONTF (CH)
Also, it is determined whether or not the tone generation flag ONF (CH) is "0".

When both of these flags are "0", "1 (pronunciation instruction)" is set in ONTF (CH) (step C9) and N, that is, the key number is stored in KEY (CH). (Step C10). Next, MONO
It is determined whether F is "1" (step C1).
1). If this value is "0", that is, stereo, O
Set "1" to NTF (CH + 4) (step C1
2), N, that is, the key number is stored in KEY (CH + 4) (step C13). Thus, in the stereo mode, the sounding trigger flag of the paired channel (CH + 4) is set to “1”, and the same key number as that of the channel (CH) is set in the pitch register of the paired channel (CH + 4). To store.

If MONOF is "1" in step C11, or if CH exceeds "7" in step C7, or if CH exceeds "3" in step C8, or if the key number is in step C2. If there is no N key change, the value of N is incremented (step C14). Then, it is determined whether or not the incremented value of N exceeds the number of keys (step C15). If the value of N is less than or equal to the number of keys, the process proceeds to step C2, and when the key with the next key number N changes to ON, the above loop up to step C15 is repeated.
When the value of N exceeds the number of keys in step C15,
Return to the main flow.

On the other hand, when the key with the key number N is turned off in step C2, the pointer N designating the key number is set to "0" in the flow of FIG. 8 (step C16). Then, the following loop is repeated while incrementing the value of N. It is determined whether or not ONF (CH) is "1 (sound generation state)" (step C17). If this flag is "1", the key number N related to key release is determined.
It is determined whether or not the pitch of No. 1 and the pitch of the pronunciation state stored in KEY (CH) match (step C1).
8). ONF (CH) is "0" in step C17.
If the pitch of the key number N does not match the pitch of KEY (CH) in step C18, the value of CH is incremented (step C19). Next, it is determined whether or not MONOF is "1" (step C20). When MONOF is "1 (monaural)", it is determined whether or not the value of CH exceeds "7" (step C21). On the other hand, when MONOF is "0 (stereo)", it is determined whether the value of CH exceeds "3" (step C22). In step C21 or step C22, the value of CH is "7".
Or, in the case of "3" or less, at step C17 O
It is determined whether NF (CH) is "1".

If the pitch of the key number N and the pitch of the KEY (CH) match in step C18, the mute trigger flag OFTF (CH) is set to "1 (mute instruction)" (step C23). . Next, MONOF is "1"
It is determined whether or not (step C24). MONO
When F is not "1", that is, in the stereo mode, OFTF (CH + 4) is set to "1" (step C25). As described above, when the key number N is turned off by releasing the key in the stereo mode, the pair of channels being sounded is instructed to be muted.

In step C25, OFTF (CH +
After setting 4) to "1", if MONOF is "1" in step C24, or if CH exceeds "7" in step C21, or if CH exceeds "3" in step C22. In this case, the value of N is incremented in step C14 of FIG. Then, it is determined whether or not the incremented value of N exceeds the number of keys (step C15). If the value of N is less than or equal to the number of keys, the process proceeds to step C2 to determine the change of the key with the key number N. When the value of N exceeds the number of keys in step C15, the process returns to the main flow.

FIG. 9 is a flow chart of the tone generation processing in the main flow. Since the sound generation process is performed by sampling in a fixed cycle, first, it is determined whether or not the sampling cycle has elapsed (step D1). If the sampling cycle has not elapsed, this flow is ended, but when the sampling cycle has elapsed, the pointer CH designating the channel is set to "0" (step D2), and the channel processing is executed (step D3). . Then, the value of CH is incremented (step D4). Next, it is determined whether the value of CH exceeds "7" (step D5), and C
When the value of H is "7" or less, the channel process of step D3 is executed. When the value of CH exceeds "7", that is, when the channel processing for all sound generation channels is completed, output processing is executed (step D
6) Return to the main flow.

FIG. 10 is a flow chart of the channel processing in step D3, in which the waveform generation processing (step E1) and the envelope processing (step E2) in the channel designated by CH are executed. 11 to 14 are flowcharts of the waveform generation processing in step E1. Figure 1
1, the tone generation trigger flag ONTF (CH) is "1".
(Pronunciation instruction) "(step F
1) If the flag is "1", the initial address generation process is executed (step F2). In the initial address processing, as shown in FIG. 14, it is determined whether or not MONOF is "1 (monaural)" (step F31), and MO is determined.
When NOF is "0 (stereo)", it is determined whether the value of CH is "0" to "3" (step F3).
2). When the value of CH is "0" to "3",
In the area of the waveform memory unit 15 shown in, the initial address of the channel designated by CH is stored in the register AD (step F33), and the value of CH is "4".
If the value is "7", the offset O is added to the AD address.
The value of FSET is added (step F34). In the stereo mode, the PCM data in each area of CH0 to CH3 and the PCM data in each area of CH4 to CH7 in FIG.
It is CM data. Therefore, by adding an offset (in this case, "10000") to the initial address in each area of CH0 to CH3, CH4 to
The initial address of each area of CH7 is obtained.

When the initial address generation process of FIG. 14 is completed, the process returns to step F3 of FIG. 11 to determine whether or not the channel designated by the pointer CH is "0" to "3". If the channel is "0" to "3",
Data of the PCM data read step speed ΔD is generated according to the pitch of the key depression (step F5). Next, data of the filter coefficient F is generated according to the designated tone color (step F6). That is, the data of the filter coefficient corresponding to the tone color of the channel designated by CH is stored in the ROM.
Read from 3. Also, data of the initial amplitude value AMP is generated according to the velocity of the key depression (step F7). Next, the created data is stored in the register designated by the pointer CH. That is, the data of ΔAD is stored in the register ΔAD (CH) (step F8), the data of the filter coefficient F is stored in the register F (CH) (step F9), and the data of the initial amplitude value AMP is stored in the register AM.
Store in P (CH) (step F10).

After step F10, M in FIG.
It is determined whether or not ONOF is "1" (step F
12). When MONOF is “0”, CH (=
The same data created in steps F5 to F7 is copied and stored in the register of the channel (CH + 4) that makes up the stereo with the channel specified by "0" to "3"). That is, the data of ΔAD is copied to the register ΔAD (CH + 4) (step F13),
The data of the filter coefficient F is copied to the register F (CH + 4) (step F14), and the data of the initial amplitude value AMP is copied to the register AMP (CH + 4) (step F1).
5). Next, the ONTF is returned to "0" (step F1
6), ONF is set to "1 (sound generation state)" (step F17).

After this, that is, the channel is "0"-
If it is “3”, ΔAD (CH), F (CH),
And the data stored in the AMP (CH) are controlled by the envelope obtained by the arithmetic processing in the envelope processing described later. In FIG.
The step speed data of ΔAD (CH) is controlled by the pitch envelope PE (step F18), and AD (C
The controlled ΔAD is added to H) to set the read address (step F19). Then, the waveform data (PCM data) is read from the waveform memory unit 15 based on AD (CH) (step F20). Next, F (CH) is controlled by the filter envelope FE (step F2
1), the waveform data is filter-controlled by F (CH) (step F22). Next, AMP (CH) is controlled by the amplifier envelope AE (CH) (step F23), and the amplitude of the waveform data is controlled by AMP (CH) (step F2).
4). Then, the envelope-controlled waveform data is stored in the output register OUT (CH) (step F2
5) Return to the channel processing flow of FIG.

When the channels designated by CH in step F3 of FIG. 11 are "4" to "7",
It is determined whether MONOF is "1" (step F4). When the MONOF is in the monaural mode of "1", as in the case of the channels of "0" to "3",
The processing from step F5 to step F10 is performed. Next, step F12 to step F1 in the flow of FIG.
Move to 6 and return ONTF to "0" and ONF to "1"
(Sound state) "(step F17). After this, as in the case of the channels of "0" to "3", the processing from step F18 to step F25 of FIG. 13 is performed, and the flow returns to the channel processing flow of FIG.

In step F4 of FIG. 11, MONOF
Is in the stereo mode of "0", step F
The processing from 5 to step F10 is not performed. This is because the coefficients created for the channels "0" to "3" have already been copied in steps F12 to F14 of FIG. Therefore, in this case, FIG.
Flow proceeds to step F16 and ONTF is set to "0"
Then, the ONF is set to "1 (sound generation state)" (step F17). After this, as in the case of the channels of "0" to "3", the processing from step F18 to step F25 of FIG. 13 is performed, and the flow returns to the channel processing flow of FIG. In step F1 of FIG.
When F (CH) is "0", it is determined whether ONF (CH) is "1" (step F11). O
If the NF (CH) is already in the sounding state of "1", the envelope control processing from step F18 to step F25 in FIG. 13 is performed, and the flow returns to the channel processing flow in FIG.

15 to 18 are flowcharts of the envelope processing of step E2 in the channel processing of FIG. Since the envelope data changes in a span longer than the sampling period, it is determined in FIG. 15 whether or not a predetermined number of times the sampling period has elapsed (step G1). When this time has elapsed, O
It is determined whether or not NF (CH) is "1 (sound generation state)" (step G2). When ONF (CH) is “0 (silenced state)”, or when the time of a predetermined number of times the sampling period has not elapsed in step G1,
This flow ends. ONF in step G2
When (CH) is "1", it is determined whether the OFTF is "0" (step G3). When the OFTF is "0" and the mute instruction is not issued, it is determined whether or not the channel designated by CH is "0" to "3" (step G4). The designated channel is "4"
If it is "7", it is determined whether or not MONOF is "1" (step G5). When the channel designated in step G4 is "0" to "3", or when MONOF is "1" in step G5, the pitch envelope PE is generated (step G).
6) Generate the filter envelope FE (step G
7) Generate an amplifier envelope AE (step G)
8). Next, the generated envelope is stored in the register of the channel designated by CH. That is, PE is stored in the register PE (CH) (step G9), and FE
Is stored in the register FE (CH) (step G1
0), AE is stored in the register AE (CH) (step G11).

Next, in the flow of FIG. 16, MONO
It is determined whether F is "1" (step G1).
2). When the MONOF is in the monaural mode of "1", this flow ends, but when the MONOF is in the stereo mode of "0", the channel specified by CH and the register of the pair of channels forming the stereo are registered. ,
The envelope generated in steps G6 to G8 is copied and stored. That is, PE is a register PE
Store in (CH + 4) (step G13) and store FE in register FE (CH + 4) (step G1).
4), the AE is stored in the register AE (CH + 4) (step G15). Then, the process returns to step D4 in the tone generation processing flow of FIG. 9 to increment the value of CH.

When OFTF is "1 (silence instruction)" in step G3 of FIG. 15, it is determined whether the channel designated by CH in the flow of FIG. 17 is "0" to "3". (Step G16). When the designated channel is "4" to "7", it is determined whether MONOF is "1" (step G17). When the designated channel is "0" to "3" or when MONOF is "1" in step G17, the release pitch envelope RPE is generated (step G18) and the release filter envelope RFE is generated ( In step G19), the release amplifier envelope AE is generated (step G20). Next, the generated release envelope is stored in the register of the channel designated by CH. That is, RPE is a register PE
(CH) (step G21), RFE is stored in register FE (CH) (step G22), RA
Store E in register AE (CH) (step G2)
3). Next, it is determined whether or not MONOF is "1" (step G24). When the MONOF is in the stereo mode of "0", the envelope generated in steps G18 to G20 is copied and stored in the register of the pair of channels that make up the stereo with the channel designated by CH. That is, RPE is a register PE
It is stored in (CH + 4) (step G25), and RFE is stored in the register FE (CH + 4) (step G2).
6), RAE is stored in the register AE (CH + 4) (step G27).

After storing the release envelope in the register of the pair of channels forming the stereo, or in step G17 or step G24, MONOF.
Is in the monaural mode of “1”, it is determined in the flow of FIG. 18 whether AE (CH) is “0” (step G28). That is, it is determined whether or not the volume of the channel designated by CH has reached zero. A
When E (CH) is "0", ONF (CH) is returned to "0 (silenced state)" (step G29), and OFT
F (CH) is returned to "0" (step G30). Then, the process returns to step D4 in the tone generation processing flow of FIG. 9 to increment the value of CH.

FIGS. 19 and 20 are flow charts of the output processing of step D6 in the sound generation processing of FIG. In FIG. 19, it is determined whether or not the sampling period has elapsed (step H1), and if it has not elapsed, this flow ends. When the sampling period has elapsed, both the L-channel and R-channel output registers OUTL and OUTR are set to "0 (clear)" (step H
2). Further, "0" is set to the pointer CH designating the channel (step H3). Next, MONO
It is determined whether F is "1" (step H4).
When MONOF is “1”, the waveform data stored in OUT (CH) in step F25 of FIG. 13 is stored in OUTL (step H5). After this, C
The value of H is incremented to specify the next channel (step H6). Then, it is determined whether or not the value of CH exceeds the last channel number "7" (step H7). If the value of CH is "7" or less, the waveform data of OUT (CH) is output OUT in step H5.
Accumulate to L. The value of CH is "7" in step H7.
When it exceeds, the waveform data of OUTL is output to the D / A converter 7 (step H8). Then, the process returns to the main flow.

In step H4, MONOF is "0".
When the stereo mode is No., it is determined whether CH is “0” to “3” in the flow of FIG. 20 (step H9). When CH is on the L channel side of "0" to "3", a constant α (0 <α <1) that determines the distribution ratio between the L channel and the R channel is output.
The waveform data of (CH) is multiplied (step H10).
Then, the waveform data of OUT (CH) multiplied by α is set to O
Store in the UTC (step H11). Step H9
In the case where the CH is on the R channel side of "4" to "7", the waveform data of OUT (CH) is multiplied by (1-α) (step H12). Then, the waveform data of OUT (CH) multiplied by (1-α) is stored in OUTR (step H13). After storing the waveform data in OUTL or OUTR in step H11 or step H13, the value of CH is incremented to specify the next channel (step H14). And C
It is determined whether or not the value of H exceeds the last channel number "7" (step H15). CH value is "7"
In the case of the following, the channel designated by CH in step H9 is the L channel side or R
It is determined whether or not it is on the channel side, and the processes of steps H10 and H11 or the processes of steps H12 and H13 are executed. That is, α or (1-
The waveform data of OUT (CH) multiplied by α) is output to OUTL
Alternatively, it is stored in OUTR and accumulated. When the value of CH exceeds "7" in step H15, the waveform data of OUTL and the waveform data of OUTR are output to the D / A converter 7 (step H16). Then, the process returns to the main flow.

As described above, according to the above embodiment, when the tone generation mode is set to the monaural mode, the waveform shaping data corresponding to each musical tone waveform data is generated and the tone generation mode is set to the stereo mode. , The waveform shaping data corresponding to only one of the pair of tone waveform data forming the stereo is generated, and the waveform shaping data corresponding to the other tone waveform data is generated as one tone waveform data. The waveform shaping data corresponding to is duplicated. Therefore, in a configuration in which a plurality of sound generation channels can be sounded in a monaural mode and a stereo mode, it is not necessary to duplicately store parameters for generating envelope data in a memory such as a ROM even in the stereo mode. In addition, it is possible to eliminate the need to duplicate the same envelope data calculation process, and it is possible to secure as many timbres as there are sound generation channels even in the monaural mode.

In the above embodiment, the CPU 1 is a tone waveform type PC previously stored in the waveform memory unit 15.
Although the musical tone waveform data is generated by reading the M data at a reading speed according to the event data, the musical tone waveform data may be generated by software based on the event data. Even in this case, it is clear that the same effect can be obtained. In any case, in the stereo mode, the CPU 1 generates the envelope data for one of the pair of channels forming the stereo and duplicates the created envelope data for the other channel. Therefore, the load on the CPU 1 is reduced, and higher-speed tone generation processing is possible. In this case, the CPU 1 generates the pitch envelope data for one of the pair of channels forming the stereo, duplicates the created pitch envelope data for the other channel, and uses the created and duplicated pitch envelope data for the PCM data. To control the read step speed. As a result, the same pitch envelope data will not be created redundantly, so that the reading process of the CPU 1 can be made faster.

In the above embodiment, the invention of the musical tone generating device has been described. However, the musical tone generating process as shown in the flowchart of the embodiment is applied to a storage medium such as a CD, MD or a floppy (registered trademark) disk. It is also possible to store the program to be executed, attach the storage medium to a general-purpose information processing device such as a personal computer, and install the tone generation processing program. In this case, the invention of the program is constituted. The tone generation program includes a first step of setting the sound generation mode of a predetermined number of sound generation channels to a monaural mode or a stereo mode, and a predetermined number of music sounds assigned to a predetermined number of sound generation channels according to the input event data. The second step of generating the waveform data, and when the sound generation mode is set to the monaural mode by the first step, the waveform shaping data corresponding to each musical tone waveform data is generated, and the sound generation mode is generated by the first step. If is set to the stereo mode, the waveform shaping data corresponding to only one tone waveform data of the pair of tone waveform data forming the stereo is generated and the waveform shaping data corresponding to the other tone waveform data is generated. Is a third step of replicating the waveform shaping data corresponding to one of the musical tone waveform data, And is configured with a fourth step of subjecting the data forming process for each tone waveform data corresponding are by produced or replicated waveform shaping data in three steps.

In this case, in the second step, the musical tone waveform PCM data previously stored in the predetermined storage means is read at a read speed corresponding to the event data to generate the musical tone waveform data. Alternatively, the second step is to generate musical tone waveform data by software based on the event data. Further, in each of the above cases, the third step is to generate or copy envelope data for performing tone color control on the tone waveform data. Further, in this case, the third step generates or duplicates the pitch envelope data, and the fourth step controls the step rate of reading the PCM data in the second step by the pitch envelope data.

[0038]

According to the present invention, when the tone generation mode is set to the monaural mode, waveform shaping data corresponding to each musical tone waveform data is generated, and when the tone generation mode is set to the stereo mode. Is a waveform forming data corresponding to only one of the pair of tone waveform data forming a stereo, and the waveform forming data corresponding to the other tone waveform data is a waveform corresponding to one tone waveform data. Since the molding data is duplicated, even in the stereo mode, it is not necessary to store the parameters for generating the envelope data in duplicate, and it is not necessary to perform the arithmetic processing of the same envelope data in duplicate. In addition, even in the monaural mode, it is possible to secure as many timbres as there are sounding channels.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of a musical tone generating apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a CPU 1 in FIG.

FIG. 3 is a diagram showing a memory map of the waveform memory unit in FIG.

FIG. 4 is a diagram showing an area such as a register of the RAM in FIG.

5 is a main flowchart of a musical sound generation process executed by the CPU of FIG.

FIG. 6 is a flowchart of a switch process in FIG.

FIG. 7 is a flowchart of keyboard processing in FIG.

FIG. 8 is a flowchart of keyboard processing subsequent to FIG.

9 is a flowchart of the sound generation process in FIG.

10 is a flowchart of channel processing in FIG.

11 is a flowchart of the waveform generation process in FIG.

FIG. 12 is a flowchart of waveform generation processing continued from FIG. 11.

13 is a flowchart of waveform generation processing continued from FIG.

14 is a flowchart of initial address generation processing in FIG.

15 is a flowchart of envelope processing in FIG.

16 is a flowchart of envelope processing following FIG.

FIG. 17 is a flowchart of envelope processing following FIG. 15.

FIG. 18 is a flowchart of envelope processing following FIG. 17.

FIG. 19 is a flowchart of output processing in FIG.

FIG. 20 is a flowchart of output processing subsequent to FIG.

[Explanation of symbols]

1 CPU 3 ROM 4 RAM 5 Display 6 controls 7 D / A converter 8 output circuits 11 Control unit 12 Waveform readout section 13 Envelope calculator 14 Waveform output section 15 Waveform memory section

Claims (10)

[Claims] 1. A mode setting means for setting a sound generation mode of a predetermined number of sound generation channels to a monaural mode or a stereo mode, and a predetermined number of musical tone waveform data to be assigned to the predetermined sound generation channels according to input event data. Waveform data generation means for generating, and when the sound generation mode is set to the monaural mode by the mode setting means, generates waveform shaping data corresponding to each musical tone waveform data, and the mode setting means generates the sound generation mode. Is set to the stereo mode, the waveform shaping data corresponding to only one tone waveform data of the pair of tone waveform data forming the stereo is generated, and the waveform shaping data corresponding to the other tone waveform data is generated. For the above, the waveform shaping data corresponding to the one tone waveform data is duplicated. Musical tone generating apparatus comprising: a shape data generation unit, and a data forming means for performing data forming process for each tone waveform data corresponding the generated or replicated waveform shaping data by the molding data generating means. 2. The waveform data generating means generates musical tone waveform data by reading musical tone waveform PCM data stored in advance in a predetermined storage means at a read speed corresponding to the event data. The musical sound generating device according to claim 1. 3. The musical tone generating apparatus according to claim 1, wherein the waveform data generating means generates musical tone waveform data by software based on the event data. 4. The musical tone generating apparatus according to claim 1, wherein the shaping data generating means generates or duplicates envelope data for performing tone color control on the musical tone waveform data. . 5. The shaping data generating means generates or duplicates pitch envelope data, and the data shaping means controls the step rate of reading the PCM data in the waveform data generating means according to the pitch envelope data. The musical sound generating device according to claim 4, characterized in that 6. A first step of setting a sound generation mode of a predetermined number of sound generation channels to a monaural mode or a stereo mode, and a predetermined number of musical tone waveform data assigned to the predetermined sound generation channels according to input event data. And a second step of generating waveform shaping data corresponding to each musical tone waveform data when the tone generation mode is set to the monaural mode by the first step, and by the first step When the tone generation mode is set to the stereo mode, waveform shaping data corresponding to only one musical tone waveform data of the pair of musical tone waveform data forming a stereo is generated and corresponding to the other musical tone waveform data. Regarding the waveform shaping data, a third method for duplicating the waveform shaping data corresponding to the one tone waveform data Steps and the third step in the generation or duplicated waveform fourth step and, tone generation processing program having subjected to data shaping process on each musical tone waveform data corresponding by molding data. 7. The musical tone waveform data is generated in the second step by reading musical tone waveform PCM data stored in advance in a predetermined storage means at a read speed according to the event data. The musical sound generation processing program according to claim 6. 8. The musical tone generation processing program according to claim 6, wherein the second step generates musical tone waveform data by software based on the event data. 9. The tone generation processing according to claim 6, wherein the third step generates or duplicates envelope data for performing tone color control on tone waveform data. Program of. 10. The third step generates or duplicates pitch envelope data, and the fourth step controls the step rate of reading the PCM data in the second step according to the pitch envelope data. 10. The musical sound generation processing program according to claim 9.