JPH0468399A - Envelope waveform generating device - Google Patents

Abstract

PURPOSE:To vary the attenuation characteristic of an envelope waveform according to key-off timing by setting a specific position on the envelope waveform, detecting whether a key is turned off before the specific position or not, and performing the attenuation processing of the envelope waveform with characteristics generated at the key-off position. CONSTITUTION:The device consists of a central processing unit(CPU) 10, a key detecting circuit 13, an EG setting switch 14, a sound source circuit 16, a keyboard 18, etc. Then the specific position (DP) is provided on the envelope waveform, and the envelope is attenuated with a 1st attenuation characteristic when key-off operation is performed before the DP or with a 2nd attenuation characteristic different from the 1st attenuation characteristic when the key-off operation is performed behind the DP. Consequently, the attenuation characteristics of the envelope waveforms are selected according to the key-off timing and release play at the time of the key-off operation is made distinctive according to a performance operation state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an envelope waveform generator suitable for use in electronic musical instruments.

[Prior Art] Conventionally, as an envelope waveform generator for electronic musical instruments,
It is known to generate an envelope waveform consisting of a plurality of states such as attack and decay (for example, Japanese Patent Publication No. 39072/1983).

However, in conventional envelope waveform generators, no matter how you play the instrument, the attenuation characteristic of the envelope waveform after key-off does not change, resulting in the inconvenience that the played sound becomes monotonous.

[Problems to be Solved by the Invention] The present invention has been made in view of the drawbacks of the prior art described above, and an object of the present invention is to provide an envelope waveform generator capable of changing the attenuation characteristics of an envelope waveform depending on the key-off timing. .

[Means for Solving the Problems] In order to achieve the above object, the present invention sets a specific position on the engineering lobe waveform and detects whether or not a key-off is performed before this specific position. , key-off (attenuation) processing of the envelope waveform is performed with characteristics corresponding to the position where the key-off is performed.

[Function] To explain the present invention using a specific example, the envelope waveform may include, for example, an attack state in which the amplitude rapidly increases, a decay state in which the amplitude rapidly decreases, and an envelope in which the amplitude is constant or the same. It consists of states arranged in the order of a hold state that repeats the waveform, and a release or sustain state that slowly decays in amplitude. A decay point is set as a specific position on this envelope waveform, and if a key-off occurs before this decay point, the envelope is
(for example, the release or sustain rate); on the other hand, if there is a key-off after the decay point, it is attenuated according to a second damping characteristic that is different from the first damping characteristic. , the damping characteristics change depending on how you play (see Figure 9)
. For example, the attenuation rate of the first attenuation characteristic may be changed to the attenuation rate of the first attenuation characteristic.
By setting the attenuation rate higher than the attenuation rate of the attenuation characteristic, it is possible to differentiate between playing, such as having a quick attenuation when played in a staccato manner, and a reverberant feel at other times. Therefore, depending on the electronic musical instrument using this device, the performer can perform the performance according to his/her taste. The characteristic of attenuation after that may give a click feeling to the musical tone at key-off, but this point is not important to the present invention. It is possible to select the damping characteristics.

Therefore, in the electronic musical instrument to which the present invention is applied, the release at key-off can be played differently depending on the performance operation state.

[Example] Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows the hardware configuration of an electronic musical instrument according to an embodiment of the present invention.

The electronic musical instrument shown in the figure is configured to use a central processing unit (CPU) 10 to control its overall operation.

A read-only memory (ROM) 11, a random access memory (RAM) 12, a key detection circuit] 3, an EG stage setting switch group 4, another switch group 15, and a sound source circuit 1 are connected to the CPU10 via a bidirectional pass line BLIS.
6 is connected. Further, a timer circuit 17 is connected to CPLIIO via a signal line L, a keyboard circuit 18 is connected to the key detection circuit 13, and a sound system 19 is connected to the sound source circuit 16.

The ROM II is provided with a program area and a parameter area. The program area includes main routine processing corresponding to the flowcharts shown in Figs.
and various control programs such as timer-interrupted processing.

The envelope waveform of the musical tone generated in this electronic musical instrument has various states such as attack, decay, halt, and release or sustain, as shown in FIGS. 8 to 11. The parameter area contains rate data and targets (
It is stored either as level data representing the final) level or as a table for each tone.

The following register groups are set in the RAM 12 in order to temporarily store various data generated when the CPU 10 executes the control program. Note that in the following, registers and their contents are represented by the same label. Further, i (=0 to 7) is a state number, for example, state 0 represents an attack state, and state 1 represents a decay state. j 0-15
) is the pronunciation channel number.

Li Nistate i target level 0-95. 25 (0,75 steps, 7 bits) R
Rate of i state i from 0 to 95. 25 (0,75 steps, 7 bits) R
R: Release rate 0-95. 25 (0,75 steps, 7 hits)S
USR: Sustain rate 0-95. 25 (0,75 steps, 7 hits)E
Gj: Current envelope level of channel j 0 to 95
．． 25 (0,75 steps, 7 bits) INTj:
Channel J initial touch 0-127 (7 bits) KCDj: Key code assigned to channel j MP: Mask point 0-7 (3 bits) DP: Decay point 0-7 (3 bits) HP: Hold point 0 to 7 (3 bits) SUSON: Sustain flag sustain on, 0: sustain off SYNM Nishinse flag 1 Synth flag, 0 Normal mode DPINH: D
P inhibit flag DP inhibit, ODP enable HOLDj:
Channel J halt flag 1: Halt KONj: Channel j key-on flag 1: Key-on KOFFj: Channel J key-off flag Envelope waveform formation end The key detection circuit 13 detects the operation status of each key on the keyboard 18. Detection is performed to generate key information representing key presses, m keys, and key touches (initial touches) for each day of the week.

The EG stage setting switch group 4 includes a sustain on/off switch, a synth mode setting switch, a DP inhibit switch, and the like, and generates switch information representing the on/off or setting status of each of these switches.

Other switch group 15 includes a tone selection switch,
There is a volume setting switch and various effect switches.

The sound source circuit 16 receives enrobe level information EGj1, which is sent out from the CPU 10 in response to the on/off or setting states of the EG stage setting switch group 4 and other switch groups 15, and the operation of the keyboard 18.
A musical tone signal is formed based on musical tone control information such as an off command, key coat information KCDj, and initial touch information INTj. This musical tone signal is transmitted to the sound system 19
supplied to Here, the sound source circuit 16 has a number j (-
16 time-division sound generation channels represented by 0 to 15) are formed, and this electronic musical instrument is capable of simultaneously sounding 16 musical tones.

The sound system 19 converts the musical tone signal supplied from the sound source circuit 16 into sound and emits sound.

Next, the operation of the CPU 10 in the electronic musical instrument shown in FIG. 1 will be explained with reference to the flowcharts shown in FIGS. 2 to 7.

When the electronic musical instrument shown in FIG. 1 is powered on (not shown), the CPU 10 starts operating according to the control program stored in the ROM II. First, step 10 in Figure 2
The processing shown in the main routine below 0 is executed, and at the same time, the timer interrupt processing shown in FIGS. 5A and 5B is executed.

Referring to FIG. 2, first, in step 201, RAM1
Target rate register LO to L7, rate register RO-R7, release rate register RR, sustain rate register S for each state set in 2
US R, enhero frequency registers EGO to EG15 for each sound generation channel, initial touch registers INTO to TNT15, key coat register KC
DO~KCD15, key-on flag KONO~KON
15 and hold flag HOLDO-HOLD15,
Mask point register MP, Decay point register DP, Halt point) register HP, Sustain flag 5USON, Synth flag SYNM, Narahini D
Clear the P inhibit flag DPINH and set the key-off flag KOFFO-KOFF of each sound channel.
Perform initial settings such as setting each i5 to 1. After that, the key press process in step 202, step 203
A circular process consisting of the EG setting process in step 204 and other processes in step 204 is executed.

FIG. 3 shows the key press process (step 202) in FIG.
Show details.

Referring to FIG. 3, in step 301, the key detection circuit 1
Based on the output of step 3, it is determined whether or not there has been a change in the key state due to a key depression on the keyboard 18 (key-on event has occurred). If there is a key-on event, the musical tone (key coat) corresponding to the key where the on-event has occurred is determined in step 302.
At step 303, the key-on flag KON of the assigned sound channel j is assigned.
Set j to 1, and store the key coat and initial touch data of that key in the key coat register KC.
Dj and initial touch register ■NTjl: Stored, and in step 304 note-on (start of sound generation) command to the j channel of the sound source circuit 16, the key code KCD
After sending out j and the initial touch data INTj, the process advances to step 305. Thereby, the tone generator circuit 16 starts musical tone forming processing based on these key codes KCDj, initial touch data INTj, and envelope level data EGj, which will be described later.

On the other hand, if the determination in step 301 is "NO", that is, no key-on event has occurred, step 30
Steps 2 to 304 are skipped and the process proceeds directly from step 301 to step 305.

In step 305, from the output of the key detection circuit 13,
The presence or absence of a key release operation (key-off event) on the keyboard 18 is determined. If there is a key-on event, step 3
In step 06, the sound generation channel to which the key code corresponding to the key with the key-off event is assigned is searched.

If the corresponding channel j is found, proceed to the next step 30.
7 branches to step 308 and resets the key-on flag KONj of the corresponding channel j, followed by step 30.
At step 9, note off (
After sending out the command (stop sound generation), this key press process is completed and the process returns to the main process (step 2o3 in FIG. 2). As a result, the sound source circuit 16 performs processing for forming a musical tone signal after key-off in the corresponding channel j.

On the other hand, if the judgment in step 307 is rNOJ, that is, no sounding channel to which the same key coat as the key that was keyed off is found, step 3
Skipping the processes from 08 to 309, the key press process is immediately terminated from step 307, and the process returns to the main process (step 203 in FIG. 2).

If the determination in step 305 is rNOJ, that is, a key-off event has not occurred, steps 306 to 309 are skipped and the key press process is directly terminated from step 305 to the main process (see FIG. 2). Return to step 203).

FIG. 4 shows the EG setting process (step 20) in FIG.
Details of 3) are shown below.

In this EG setting process, the CPU 10 reads the setting state of each switch constituting the EG stage setting switch group 4, and stores the parameters corresponding to the setting state in the corresponding register in the RAM 12. For example, the target level LO to L7 of each state, the level change rate RO to R7 of each state, the release rate RR1, and the sustain rate 5USR are data read from a table in ROMII corresponding to the tone selected by the tone selection switch. corresponding registers LO to L7 and RO, respectively.
Stored in ~R7, RR and 5USR. Also, Mask Point MP, Decay Point DP, Halt Point HP, Sustain On/Off 5USON, Syntop Mote On/Off SYNM, and DP Inhibit On/Off.
Each parameter of OFF DPINH is created based on the state of each setting switch in the EG stage setting switch group 4,
registers MP, DP and H, respectively.
P, flag 5 Stored in USON, SYNM and DPINH.

When the CPU 10 receives a clock with a fixed period (for example, 50 μs) from the timer 17 via the signal line L,
Using this as an interrupt signal, the timer-interrupted processing shown in FIGS. 5 to 7 is executed. Here, 1, represented by channel number j, is processed by - times of timer interrelated processing.
Envelope waveform formation processing for each sound generation channel is executed.

Referring to FIG. 5A, in step 501, it is determined whether this timer-interrupted processing is the first interrupt processing for channel j after it is assigned as the sound generation channel. For the first interrupt processing, the attack rate RO is set to the maximum value (9
5, 25). If the maximum value is
In step 503, the state number i is set to 1, and the envelope level EGj is set to the attack state (i=0).
After setting the target level LO, the process proceeds to step 505. In this case, the envelope waveform has an extremely steep attack waveform that changes from the initial value to the attack target value LO and instantly ends the attack state. On the other hand, if the attack rate RO is not the maximum value, step 5
After setting the state number i to O and setting the envelope level EGj to 1/2 of the maximum value (47, 25) in step 04, the process proceeds to step 505. In this case, the envelope waveform has an initial value of 4725, and the attack state starts from here.

Next, in step 505, the key-off flag KOFFj is reset, and the process advances to step 551 (fifth section B).

If the result of the determination in step 501 is rNOJ, that is, this interwoven processing is the second or subsequent time for the channel after the sound generation is assigned to channel j by the key-on event, the process proceeds to step 511.

In step 511, the key-off flag KOFFj is checked. The flag KOFFj becomes 1 when the formation of the enclosing waveform signal is completed (see step 615 in FIG. 6 and step 707 in FIG. 7). I wanted to,
In this case, step 551 (
Proceed to Figure 5B).

If the determination result in step 511 is KOFFj=0, then in step 512 the key-on flag KONj is checked. If the key is on (KONj=1), then in step 513 the halt flag HOLDj is checked.

If the flag HOLDj is 0, at step 514 the subroutine (FIG. 6) described later is executed to increase or decrease the envelope level EGj at the rate Ri of the current state i, and then at step 551 (FIG. 5B) described above. Proceed to.

On the other hand, if the determination result in step 513 is HOLDj;1, in step 521 the synth remote flag SYNM is set.
If it is the synth mode (SYNM=1), the DP inhibit flag DPI is checked in step 522.
Inspect NH.

If it is DP inhibit mode (DPINH=1), in step 523, the state number i is shuffled (state jumped) to DP+1, which is the next state of the state in which the Decay point DP is set, and the original state is sold. At step 524, the halt flag HOLDj
, and further executes the envelope level increase/decrease process of the subroutine (FIG. 6) in step 514, and then proceeds to step 551 (FIG. 5B). When going through the processing in steps 521 to 524, if DP<HP, the state jump processing in step 523 converts the state number DP+ as an en\lobe waveform.
The waveform from 1 to HP is repeated.

The determination result of step 521 is normal mode (SY
If NM=O) and the determination result of step 522 is DP enable (DPINH=0), steps 521 or 522 to step 5
After proceeding to step 25 and sending the envelope pre-health data EGj to the sound source circuit 16, the step 551 (FIG. 5B)
Proceed to processing.

Referring to FIG. 6, in step 601, the magnitude of the envelope level EGj and the target level Li of the current state 1 is compared to determine whether the current slope of the enwelve waveform is positive or negative. The slope is positive (EGj<Li
), the rate R is set to the level EGj in step 602.
Add 1, and if negative (EGj≧Li), step 60
After subtracting the rate Ri from the level EGj in step 3, the envelope level EGj is subtracted in step 604 or 605.
It is determined whether or not the target level Li has been reached. If the target level Li has not been reached, step 606 or 60
7 to sound source circuit 16 envelope prepel data EGj
After sending out the original routine (step 55B in Figure 5)
Return to 1).

On the other hand, if the target level Li has been reached, step '609
After setting the envelope level EGj to the target level Li in step 610, it is determined whether the current state i is a state in which a halt point HP has been set. State with hold point HP set (
i=HP), the hold flag HOLDj is set in step 611, and if not, the state number i is incremented in step 612, and then
In step 613, the envelope level data EGj is sent to the sound source circuit 16, and in step 614, it is determined whether state number i has reached 8 or not. In this electronic musical instrument, the number of envelope states is 0 to 708.
It is set individually. Therefore, state number i or 8
If it has reached , it means that the envelope waveform forming process has been completed. In this case, after setting the key-off flag KOFFj in step 615, the process returns to the original routine (step 551 in FIG. 5B). Further, if the state number i has not reached 8, step 614
The original routine (step 55 in Fig. 5B)
Return to 1).

Returning to FIG. 5A, if the key-on flag KONj = 0 as determined in step 512, this means that the key assigned to channel j on the keyboard 18 has been released! (
This means that the key is turned off (see step 308 in FIG. 2). In this case, the key-off post-processing shown in FIG. 5B is executed.

Referring to FIG. 5B, in step 530, the halt flag HOLDj is cleared, and in the subsequent step 531, it is determined whether the current state i is a state after the state in which the mask point MP is set (i≧MP). Determine. The mask point MP is for forming a key-off envelope after the envelope waveform has been formed up to the mask point MP, without immediately accepting key-offs generated before it. Therefore, if the current state i or the state before the state MP where the mask point MP is set (i<MP), after executing the envelope level increase/decrease process of the subroutine (FIG. 6) in step 532, The process advances to step 551. In this case, the same envelope forming process as during key-on is continued.

If the judgment result in step 5310 is rYESJ, that is, the current state i is a state after the state in which the mask point MP is set (1≧MP), then in step 533, the current state i or the decay point DP is set. It is determined whether the state is a state after the state ('i>DP). Decay point l-DP is provided to make the enrobe waveform after key-off different depending on whether the key-off occurs before or after it. If the current state] is a state before the state in which the decay point DP is set (i≦DP), the DP inhibit flag DPINH is checked in step 534.6 DP inhibit mode (DPINH=1) is the state before the decay point DP means to ignore. Therefore, if the DP inhibit flag DP T NH is 1, a standard key-off envelope waveform set for each of the synth mode and normal mode is formed in steps 541 and subsequent steps described below.

On the other hand, if the DP inhibit flag DP I NH is set to O, a key-off envelope waveform different from the standard key-off envelope waveform corresponding to the key-off before the decay point DP is formed. That is, step 53
In step 5, check the synth flag SYNM and check the synth flag (
SYNM=1), the release/sustain process of subroutine (2) (FIG. 7), which will be described later, is executed in step 536, and then the process proceeds to step 551.

Referring to FIG. 7, in step 701, sustain flag 5USON is checked. Sustain On (SUSON)
= 1), the envelope level EGJ is attenuated by the sustain rate 5 USR, and if the sustain is off (SUSON-〇), the envelope level EGj is attenuated by the release rate RR, and then in step 704. The envelope level data EGj is sent to the sound source circuit 16, and in step 705 it is determined whether the envelope level EGj is greater than 0 or not. If the envelope level EGj is less than or equal to O (EGj≦0), the level EGJ is set to 0 in step 706, and the key-off flag KOFFj is set to 1 in step 707. If (EGj>O), the process directly returns to the original routine (step 551 in FIG. 5B). If the level EGj is set to O in step 706 and the key-off flag is set to KOFFj = 1 in step 707, then the channel in question goes through the timer-interrupted process in FIG. 5A or steps 511 to 525. on the route,
This is executed without going through the process of increasing/decreasing the envelope level EGj (subroutine 2) and step 538 described below. Therefore, the envelope level EGj remains constant at O. In other words, the envelope waveform formation for the channel ends.

Returning to FIG. 5B, if the determination result in step 535 is normal mode F (SYNM=O), step 5
After the state number i is set to DP in step 37 (state jump), the envelope level EGj is set to the target level Li of state DP (i-DP) in step 538.
Determine whether or not it has been reached. If the target level Li has not been reached (EGj≦Li), at step 536, the subroutine (2) of FIG. 7 is executed, and then the process proceeds to step 551. If the target level Li has been reached (EGj>i), an envelope attenuation process is performed at step 539 using a decay rate Ri (i=DP) that is the rate of state DP, and step 540 is performed to perform envelope attenuation processing to the sound source circuit 16. After sending the envelope level data EGj, step 55
Proceed to step 1.

On the other hand, if the determination result in step 533 is after the Decay point DP (i>DP), step 541
Executes the following standard key-off curve waveform forming process. That is, in step 541, the synth remote flag SYNM is checked. Normal mode (SYNM=O)
If so, in step 542 the release/sustain process of subroutine (2) (FIG. 7) is executed, and then the process proceeds to step 551. If you want, normal mode (
SYNM=O) and the key is turned off after the decay point DP (i>DP), the key-off envelope waveform becomes a release or sustain waveform formed by the processing of subroutine (2) (FIG. 7). In other words, the standard key-off envelope waveform in normal mode (SYNM=0) is a release and sustain waveform.

On the other hand, whether the judgment result in step 541 or the synth flag (S
YNM=1), it is determined in step 543 whether the current state number i is after the halt point HP. If it is before the hold point HP (i≦HP), in step 544, state number 1 is set to HP+1, which is the state number immediately after the hold point (
After the state jump), if it is after the halt point HP (i>HP), the process directly advances to step 545. In step 545, the subroutine ■
After executing the envelope level increase/decrease process shown in FIG. 6, the process proceeds to step 551.

In steps 551 to 553, the sound generation channel is switched to the next channel. That is, after the channel number j is incremented in step 551, it is determined in step 552 whether the channel number J has reached 16 or not. In this electronic musical instrument, the sound channel is
Number j=16 from 0 to 15. If channel number j is not 16, it remains as is, but when channel number j becomes 16, the channel number is set to j = 0, which is the next number after J = 15, in step 553, and then this timer interface is set. Release Rhabdo and return to the main routine.

Through the above operations, envelope waveforms as shown in FIGS. 8 to 11 can be formed.

8 to 11 show envelope waveform charts when the decay point DP is set to 1 and the halt point HP is set to 3. In each figure, the attack rate Ro is set to the maximum value (95
, 25) is set to a smaller value.

Such an envelope waveform is generated when a key-off event is detected (step 301 in FIG. 3), a sound generation channel is assigned (step 302), and a key-on flag KON is generated.
The formation process is started by setting j (step 303), a key-off event is detected (step 305), and the key-on flag KONj is reset (step 308), thereby attenuating the sound.

First, in the timer-interrupted processing (FIG. 5A) of the sound generation channel immediately after key-on detection 8, the initial values of the envelope level EGj and state number i are set to 47.25 and 0 (attack state), respectively, in step 504. is set to This causes the envelope waveform to start from the initial position specified by these initial values.

The slope portions of the envelope waveforms in FIGS. 8 to 11, excluding the release or sustain state RR/5USR, are shown in step 602 or 603 (FIG. 6).
is formed by executing the process every time the timer is interrupted.

Furthermore, through the processing in step 612, the slopes (state switching) in the envelope waveforms shown in FIGS.
By skipping step 12, the flat portion (halt state) shown in FIGS. 8-10 is formed. Furthermore, by setting the halt flag HOLDj in step 611, the state jump in step 523 is executed, and the repetition of state numbers 2 and 3 in FIG. 11 is realized.

Next, envelope formation at key-off will be explained. In the following, the order numbers given at the beginning correspond to the numbering on the broken line indicating the key-off envelope waveform in the figure.

In the case of normal mote (SYNM=on, no mask point, MP=O) shown in FIG. 8, ■ DP level ( Level L1
), the process proceeds from step 538 to step 536 in FIG. 5B and subroutine ■ in FIG. 7 is executed each time the timer is interrupted, so it is attenuated at the release or sustain rate. . Then, when the envelope level EGj becomes 0 or less (step 705), the level EGj is set to 0 and the key-off flag KOFFj is set. As a result, in subsequent timer interactions, processing is performed in a route from step 511 to step 525, so the envelope level EGj remains 0 and is not increased or decreased. That is, the envelope waveform forming process ends.

■If the key is turned off in a state higher than the DP level Li (i=DP) of the state (state O) before the state to which the DP belongs (state 1), the timer interrupt will continue until the envelope level EGj falls to the DP level. Each time, in step 539, the DP rate Ri (i
= Dp) is performed, and then step 5
At 38° 536, subroutine (2) is executed to attenuate at the release or sustain rate.

(2) When the key is turned off in the state to which the DP belongs (state 1), as in (2) above, the signal is attenuated at the DP rate until the DP level is reached, and then attenuated at the release or sustain rate.

■The state after the state to which DP belongs (state 2
When the key is turned off in step 542, subroutine (2) is executed to attenuate at the release or sustain rate.

- If the key reaches the halt point HP without being turned off, the halt state is entered from there as described above. If there is a key-off, the subroutine (2) is executed at step 542 every time the timer is interrupted, as in the case (2) above, and the signal is attenuated at the release or sustain rate.

In the case of the synth mode (SYNM=1) shown in FIG. 9, M P = O without mask point, ■ and ■
are attenuation waveforms similar to (1) and (2) in the normal mode (FIG. 8), respectively. Also, when the key is turned off in the state to which the DP belongs (states 1 to 1), the attenuation waveform is similar to that shown by the broken line (■) in FIG.

When the key is turned off in a state after the state to which the DP of ■ and ■′ belongs (state 2 or later), the state HP immediately after the hold point HP (=3) +1
(=4) (step 544), and thereafter, each time the timer is interrupted, the subroutine (2) in FIG. 6 is executed in step 514. As a result, a key-off envelope waveform (key-off E
G) is formed. That is, from the level at which the key is turned off, the signal goes to the target level L4 at the rate R4, then goes to the level L5 at the rate R5, goes to the level L6 at the rate R6, and attenuates to the level L7 at the rate R7. This envelope waveform can give a click feeling to the sound when the key is off. State number i becomes 8 (step 61
4) and sets a key-off flag KOFFj (step 615). As a result, in subsequent timer interactions, processing is performed in a route from step 511 to step 525, and the envelope level EGj does not increase or decrease. That is,
The envelope waveform forming process ends.

■If the halt point HP is reached without being keyed off, it will be held at that level, and if there is a keyed off, it will be attenuated by the keyed off EG.

In the case of normal mode (SYNM = 0) and mask point MP = 1 as shown in Figure 10, when the key is turned off in a state (state 0, e.g. point ■) before ■ No mask point P, the mask point MP is reached. , step 531 to step 53 each time the timer is interrupted.
2, the envelope level EGj increase/decrease process (of the subroutine in FIG. 6) is executed at step 532, or the key-off operation is not performed. Then, when the state number i is incremented in step 612 and reaches the mask point MP, as in FIG.
It attenuates to the decay point DP at the rate R1 of the decay point DP (=1), and then attenuates at the release or sustain rate.

(2) When DPINH=1, the key is attenuated at the release or sustain rate regardless of the position of the decay point DP, no matter where the key is turned on.

In the case of the synth mode (SYNM=1) shown in FIG. 11, mask point MP=1, ■When DPINH=1, regardless of the position of the Decay point DP, no matter where the key is turned on, the step will start from step 533 or 534. Proceeding to step 541, a key-off EG waveform is formed in the same manner as in the cases ① to ② of FIG.

■When DPINH=1, hold point HP (
=3) (step 610), the stay immediately after the Decay point DP (=1) - DP+1 (=2
) and repeats the waveforms of states 2 and 3 (loop). When the key is turned off, a key-off EG waveform is formed along the same line as in the case (2) in FIG.

[Application Examples of the Invention] Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented with appropriate modifications.

For example, in the embodiments described above, it may be controlled by software or by using dedicated hardware.

In the above description, an example has been shown in which the present invention is applied to an electronic keyboard instrument, but the present invention can also be applied to an internal sound source unit of a keyboard.

The mask point, decay point, and hold point can be set at arbitrary positions. or,
Automatic fishing may be set depending on the tone.

The release and sustain may be switched during performance using a foot pedal or the like.

The envelope waveform is not limited to a plurality of straight lines as in the above embodiment, but may be a combination of curved lines or the like. Furthermore, the present invention is not limited to one in which an envelope is formed by specifying a level and rate, but may be one in which a waveform is stored in a memory.

[Brief explanation of the drawing]

Fig. 1 is a hardware configuration diagram of an electronic musical instrument according to an embodiment of the present invention, Figs. 2 to 7 are flowcharts showing processes executed by the CPU in Fig. 1, and Figs. 8 to 11 are , is an envelope waveform diagram formed by the sound source circuit in FIG. 1; 10: Central processing unit (CPU) 13 Key detection circuit 14: EG setting switch 16, sound source circuit 18: Keyboard

Claims (1)

[Claims] (1) Envelope waveform signal forming means for forming an envelope waveform signal; Specific position specifying means for specifying a specific position on the envelope waveform; and when a key-off instruction is given, the position on the envelope waveform at the timing of the key-off. detecting means for detecting whether or not is before the specific position; and based on the detection result of the detecting means, instructing the envelope waveform signal forming means to select one of the first and second attenuation characteristics; An envelope waveform generator comprising: control means for attenuating the envelope waveform signal according to the instructed attenuation characteristic.