JP3227806B2 - Pronunciation channel assignment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound channel assigning apparatus for assigning a tone parameter output by operating a performance operator to one of sound channels.

[0002]

2. Description of the Related Art In a natural musical instrument, for example, a piano, a physical force is directly applied to a string provided corresponding to each key, and the string is vibrated to generate sound. There are sound sources corresponding to the number of strings. Therefore, in the case of a piano that is a natural musical instrument, if a large number of keys are operated, it is natural that the number of musical tones corresponding to the number of operated keys is simultaneously generated from each string as a sound source. The number does not matter.

However, in an electronic musical instrument such as an electronic piano, performance information input by a performance operation is assigned to a tone generation channel of a sound source, and sound is generated based on the performance information assigned to the tone generation channel.
The maximum number of pronunciations is limited by the number of pronunciation channels. That is, if it is 8 polyphonic having 8 sound channels, the maximum number of sounds is limited to 8, and
In the case of 16 polyphonics having 16 sound channels, the maximum number of sounds is limited to 16. Therefore,
In such an electronic musical instrument having a limited maximum number of pronunciations, if there is performance information of more than the number of channels at a given time, which performance information is preferentially assigned to the sounding channel, that is, which performance information A sound channel assignment device that determines which performance information is preferentially sounded at the expense of the sound information becomes indispensable.

As a processing method executed by the sounding channel assigning device, the following method is generally adopted.

[0005] In the first-push priority in which a sound corresponding to a key that has been pressed first is preferentially generated, the next sound is not generated unless the previous sound disappears. In the post-push priority, in which a sound corresponding to a key depressed later is preferentially generated, the preceding sound is forcibly silenced and the subsequent sounds are sequentially generated. The key number is weighted, the sound of the key number with the smaller weight is forcibly muted, and the sound of the keyboard number with the larger weight is preferentially sounded. The boosting priority is given, and the most attenuated sound among the preceding sounds is forcibly muted. Forcibly mute the sound which has been passed for the longest time since the last key is pressed, which is the priority of back-pressing. The boosting priority is given, and the sound having the higher rate of each step of the envelope among the preceding sounds is forcibly silenced.

[0006]

However, in any case, the importance of each sound in the composition expression of the composer and the performance expression of the player is inevitably ignored. In other words, in the case of, the musical expression and performance expression by the next sound are ignored, and in the case of, the musical expression and performance expression by the sound that occurred earlier are ignored,
In the case of the above, each expression by the sound of the key number with the smaller weight is ignored.

Further, the sound attenuation characteristic depends on the pitch, and high sounds attenuate rapidly, while low sounds attenuate slowly. Therefore, if you forcibly mute the most attenuated sound, or forcibly mute the sound that has elapsed since the key is pressed, the slow attenuating bass suddenly disappears. The frequency of disappearance increases, and each expression by bass is ignored. The rate value alone, like
We can't guess the true importance of the sounds that make up the song,
In some cases, there is a problem that important sounds are lost in musical composition and performance expression.

That is, in any of the conventional sounding channel assigning apparatuses, each sound in the musical composition expression of the composer and the performance expression of the player is obtained by the forced silence when the channel is full. The result was that the importance of was disregarded, which was extremely unsatisfactory for composers and performers.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and forms a pronunciation form that does not ignore the importance of each sound in a musical composition expression of a composer and a musical expression of a player. Like, for a limited channel,
It is an object of the present invention to provide a sound channel assigning device for performing assignment.

[0010]

In the present invention in order to solve the above problems SUMMARY OF THE INVENTION The fine pitch data and volume level of the musical tone as the tone <br/> parameters to be generated in response to an external operation
A plurality of performance operators for outputting minute values , a plurality of channels, and tone generation instruction means for instructing generation of a tone based on tone parameters assigned to each channel;
When a new tone parameter is output from the performance operator in a state where the tone parameters are assigned to all channels of the tone generation instructing means, within a predetermined time before the output of the new tone parameter Of the volume level included in the tone parameter assigned to the
Selecting means for selecting a tone parameter having the largest differential value among the minute values, and assigning a tone parameter output from the performance operator to a vacant channel of the tone generation instructing means; And assigning means for assigning to the channel to which the tone parameter selected by the selecting means is assigned when there is no tone parameter.

[0011]

[0012]

In the above construction, when the performance operator is operated externally , the musical tone parameter to be generated in response to the external operation is
The pitch data and the differential value of the volume level are output. Then, the allocating means allocates the musical tone parameters output from the performance operation to the channel, and the musical tone generation instructing means instructs the generation of the musical tone based on the musical tone parameter allocated to the channel, thereby producing a musical tone having a characteristic corresponding to the musical tone parameter. Occurs.

However, when a new tone parameter is output from the performance operator, if the tone parameters are assigned to all the channels of the tone generation instructing means, the selection means will output a new tone parameter from the performance operator. Among the differential values of the volume level included in the tone parameters assigned within a certain time before the output of the tone parameters ,
A tone parameter having a large differential value is selected.

When the tone parameter is thus selected, the assigning means assigns a new tone parameter to the channel to which the selected tone parameter is assigned. Therefore, the tone generation instruction based on the selected tone parameter is forcibly stopped, and instead, the tone generation instruction based on the new tone parameter assigned to the channel is started. Therefore, the tone based on the selected tone parameter is forcibly muted.

[0015]

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. That is, FIG. 1 is a block diagram showing the overall structure of an electronic musical instrument to which the present invention is applied. The CPU 1 is based on a program or the like stored in advance in a program ROM 2 and data temporarily stored in a work RAM 3. All processes required for the electronic musical instrument, such as a tone generation instruction, a tone parameter selection process, and a channel assignment process, are performed. The keyboard 4 as a performance operator is provided with a plurality of keys arranged in the order of pitch and assigned serial key numbers from 0. Each key is turned on / off in response to key press and key release.
A keyboard switch that is turned off and turned on with a time difference corresponding to the touch velocity is arranged. The on / off of the keyboard switch provided for each keyboard is
The on operation with a time difference is detected by the touch velocity detection circuit 5 and output to the CPU 1 as velocity data.

The sound source 6 is an 8-polyphonic having eight channels, and generates a tone signal in accordance with tone parameters such as pitch data and velocity data on the channel assigned by the CPU 1. The generated tone signal is input to a sound generation circuit 7 including an amplifier and a speaker (not shown), and is emitted to the outside.

The SW group 8 is provided with a power switch, a tone switch, a volume switch, and the like, which are usually provided in an electronic musical instrument, and an EDIT SW and a VALUE SW whose states are determined by a SW interrupt described later.
The operation information of these switches is provided by the CPU.
1 is input. The display unit 9 and the LED 10 are mounted on the upper surface of the musical instrument main body, and the display operation and the blinking operation are controlled by an output signal from the CPU 1.

The following various registers shown in FIGS. 2 and 3 are prepared in the area of the position portion of the RAM 2.

I Reg: Stores sequentially a value indicating a key number from 0 to the last number.

J Reg: TLR composed of 8 bits
The values 0 to 7 indicating the bits of the eg are sequentially stored.

K Reg: VEL (0) Reg to VEL
(7) Store values 0 to 7 sequentially indicating Reg.

H Reg: OP (0) Reg to OP
(7) Store values 0 to 7 sequentially indicating Reg.

M Reg: Used in a timer interrupt, and sequentially stores values 0 to 7 indicating TIMER (0) to TIMER (7).

N Reg: SC (0) Reg-SC
(7) Values 0 to 7 sequentially indicating Reg are stored. TL Reg: Consists of 8 bits, and in each bit,
If the corresponding channel is assigned, ON is stored. If the corresponding channel is not assigned, OFF is stored.

F Reg: Consisting of 8 bits, each bit having a timer T (0) corresponding to channels 0 to 7
ON if (7) is in the timekeeping state, O if in the stopped state
FF is stored. CSC Reg: The key number of the key changed from OFF to ON is stored. CVEL Reg: Stores velocity data of a key changed from OFF to ON.

T Reg: The time value stored in the VALUE Reg is stored as a predetermined time T. VALUE Reg: VAL provided in SW group 8
The time value corresponding to the operation of the UE SW is stored.

A Reg: VEL (0) Reg to VEL
(7) Temporarily store velocity data stored in Reg.

B Reg: Stores the current value of j Reg or k Reg. SC (0) Reg ■ SC (7) Reg: has storage areas of SC (0) to SC (7) corresponding to eight channels 0 to 7, and is assigned to the channel corresponding to each storage area. Store the key number. VEL (0) Reg ■ VEL (7) Reg: has storage areas of VEL (0) to VEL (7) corresponding to eight channels 0 to 7, and is assigned to the channel corresponding to each storage area. Stores velocity data. TIMER (0) Reg ■ TIMER (7) Reg: consists of TIMER (0) to TIMER (7) timer registers corresponding to eight channels 0 to 7, and each timer register is assigned a corresponding channel. The time value from the time point is counted. OP (0) Reg ■ OP (7) Reg: Stores the output level from eight channels 0 to 7 to the tone generator 7.

Next, the operation of this embodiment according to the above configuration will be described with reference to the flowcharts shown in FIGS.
That is, a series of flowcharts shown in FIGS.
This is the main routine of the present embodiment, and when the power switch provided in the SW group 8 is turned on, the CPU 1 starts the operation according to this flowchart. That is, first, the initialization processing (SA1) is executed to clear various registers shown in FIGS. Then i
Reg is set to an initial value “0” (SA2).
It is determined whether the keyboard with the key number i indicated by the value of Reg is “as is”, “ON → OFF”, or “OFF → ON”, that is, whether or not the state of the keyboard 4 has changed (SA3).

If this determination is "as is" and the keyboard with the key number i is in the OFF state or the ON state, the process proceeds from SA3 to SA10, and after the value of i Reg is counted up, It is determined whether or not the value of i Reg is the last key number (SA11). i
If the value of Reg is not the final number, the process returns to SA3, and i Re counted up in SA10 described above is counted.
The state of the key with the key number i indicated by the value of g is determined.
If the determination in SA11 is YES and the value of iReg is the final number, the initial value is set in iReg in SA2, and then the determination from SA3 is performed similarly.

The key number i sequentially indicated by the value of i Reg counted up in SA10 as described above.
When the state of the key is determined by SA3, when the key of the key number i changes from ON to OFF, “0” is set to n Reg (SA4), and the content of the nth SC Reg is i. It is determined whether or not there is (SA5). That is, the SC Reg shown in FIG. 3 includes the channels (0) to (7)
If the key number assigned corresponding to is stored, or if the determination of SA3 becomes “ON → OFF”, S
C Reg should always store the key number of the key that has just been turned OFF.

Therefore, in SA5, the n-th SC Re
It is determined whether or not the content of g is i. If this determination is NO, n is counted up (SA8), and then it is determined whether or not the value of n is "8". If not, the flow returns to SA5. Then, as described above, the SC R
Since the key number i of the key that has just been turned OFF must be stored in (0) to (7) of the eg, the determination of SA5 is always YES until n = 8. SA
When the determination in Step 5 is YES, the n-th bit of TL Reg is turned off (“0”) (SA6). Subsequently, an OFF command is output to the corresponding n-channel of the sound source 6 (SA7). As a result, the channel of the sound source 6 becomes O
The damping state is entered in response to the FF command, and the silencing process is completed.

On the other hand, if the key number i changes from OFF to ON due to a new key press, the CSC Reg
Is set to i (SA12), and CVEL R
The velocity data of the key that has just been changed from OFF to ON is taken into the eg (SA13). Further, after setting j Reg to 0 (SA14), the j-th bit of TL Reg
It is determined whether it is FF (“0”) (SA15). If this determination is NO and the j-th bit is ON, j R
After incrementing the value of eg (SA16), j
It is determined whether or not the value of Reg is 8 (SA17), and j
If the value of Reg is not 8, the process returns to SA15.

That is, as described above, TL Reg
Is composed of 8 bits to indicate ON and OFF of eight channels. If each channel is in use, ON ("1") is set to the corresponding bit, and if each channel is idle, the corresponding bit is set. OFF (“0”) is set in the eyes. Therefore, if any of the eight channels is idle, any bit of the TL Reg is OFF. Therefore, SA15 is determined while j is sequentially counted up, and when the determination of SA15 becomes YES, the OFF T
The bit of L Reg can be searched.

If the determination at SA15 is YES and it is determined that the j-th bit of the TL Reg is OFF and the channel corresponding to the j-bit is in an idle state, it is assigned to this channel. ON the ith bit of TL Reg that was OFF to indicate
(SA53). Subsequently, after setting j (channel number) to B Reg (SA54), SA in FIG.
Go to 48.

At SA48, at the B-th SC Reg,
The contents of the CSC Reg stored in SA12 described above, that is, the key number of the key that has changed from OFF to ON this time, are copied. Further, CVEL Re is added to the B-th VEL Reg.
This time OFF stored in SA13, which is the content of g →
Copy the velocity data of the key changed to ON (S
A49). Then, after starting the timer T (B) among the timers T (0) to T (7) prepared for the channels 0 to 7 (SA50),
The B bit of F Reg indicating the start of (B) is turned on (SA51).

Further, an ON command is output to the corresponding B channel of the sound source 6 (SA52), whereby generation of a tone signal is assigned to the B channel of the sound source 6, and the B channel is assigned to the B-th channel in SA48. Of the tone number indicated by the key number i as the tone pitch data copied to the SC Reg, and generation of a tone signal of a volume and a tone according to the velocity data copied to the B-th VEL Reg in SA49. . The tone signal is input from the B channel of the sound source 6 to the tone generation circuit 7, and the tone generation circuit 7 emits the tone of the pitch, volume, and timbre.

The timer interrupt routine shown in FIG. 7 and the SW interrupt routine shown in FIG. 8 are executed at predetermined time intervals in the main routine. That is, in the interrupt routine of FIG. 7, after setting an initial value 0 to m Reg (SB1), it is determined whether or not the m-th bit of F Reg is 1 (SB2). If the m-th bit of F Reg is not 1, the value of m is counted up (SB6), and it is determined whether or not the value is "8". If the value is "8", the process returns to SB1. If it is not "8", the determination process from SA2 is repeated. In other words, F Re indicating that the timer of the assigned channel has been started by the processing of SA51 in FIG. 6 described above.
Since the B bit of g is ON (“1”), it is possible to identify the timer in the start state by determining whether each bit of F Reg is 1 in SB2. it can.

Then, the determination of SB2 becomes YES,
When the B bit of F Reg is ON and the timer in the start state is specified, the corresponding TIM
After counting up ER (m) (SB3), it is determined whether or not TIMER (m) has reached a predetermined time T (SB4). If the predetermined time T has not been reached, the process proceeds to SB6 described above.
The m-th bit of F Reg is turned off. Therefore,
The B bit of F Reg turned on at the time of assignment to a channel in SA51 of FIG. 4 is maintained in the ON state only for a predetermined time T, and since the corresponding channel is in the ON state for a predetermined time T from the assignment. It is within.

In the SW interrupt routine shown in FIG. 8, it is determined whether or not the EDIT SW provided in the SW group 8 is ON (SC1).
After lighting 0 (SC2), VALUE SW is ON
It is determined whether or not the operation has been performed (SC3). VALUE
When the SW is operated, the VA set by this is set.
The LUE (time value) is stored in T (SC4), and after the value of T is displayed on the display unit 9 (SC5), the process returns. If the EDIT SW is turned off, the LED 10 is turned off (SC6), and the process returns. Therefore, the time value T to be compared with the value of TIMER (m) in SB4 of FIG. 7 can be arbitrarily set by operating the VALUE SW by the SW interrupt shown in FIG.

On the other hand, if SA17 in FIG. 4 becomes YES, any bit of TL Reg
This is the case where all eight channels 0 to 7 are in use, not F. In this case, from SA17 in FIG.
Proceeding to SA18 in FIG. 5, whether or not FReg is 0,
That is, it is determined whether or not all the bits of F Reg are OFF. Here, each bit of F Reg indicates that the corresponding channel is within a predetermined time T from the time of assignment by turning on as described above. Therefore, if the determination in SA18 is YES, it means that there is a channel 0 to 7 for which the predetermined time T has not elapsed since the assignment.

In such a case, k Reg is set to 0.
After resetting (SA19), the k-th VEL Reg
Is stored in A Reg (SA20). Subsequently, after the current value of k Reg is stored in BReg (SA
21) It is determined whether or not the k-th bit of the TL Reg is ON (SA22). The k-th bit of TL Reg is OFF
If so, after the value of k Reg is counted up (SA24), it is determined whether or not the value of k Reg is 8 (SA25). When the value of k Reg is 8, the process from SA10 in FIG. 4 is executed, and when it is not 8, the process from SA20 is executed.

Here, the TL used to determine SA22 is used.
Reg is a register that turns on the bit corresponding to the channel allocated in SA53 of FIG. 4 and turns off the bit corresponding to SA6 in FIG. 4 when the channel is turned off. Therefore, TLR
“eg” indicates a channel that is in use by turning on each bit. Therefore, if the determination of SA22 is YES, channel k is in use. In such a case, it is determined whether or not the k-th bit of F Reg is ON (SA23).
Is executed, and if it is ON, SA23 to SA
Move to 26.

Therefore, the conditions for shifting from SA23 to SA26 are the k-th bit of TL Reg and F Re
This is the case where the k-th bit of g is ON (the determinations of SA22 and SA23 are both YES). More specifically, the channel k is in the ON state, and the predetermined time T has elapsed since the assignment. This is the case in the previous state. When it is confirmed that the channel k that satisfies the condition exists, the value of k Reg is counted up (SA26), and it is determined whether the k-th bit of TL Reg is ON. If it is not ON, it is determined whether the value of k Reg is 8 (SA31), and if it is not 8, the process from SA26 is executed again.

As described above, when the determination of SA27 is performed while the value of k Reg is being counted up in SA26, the k-th bit of TL Reg is turned on in SA27.
Is detected, “A ≦ k-th VE
L Reg is determined (SA28). here,
“A” is velocity data previously stored in A Reg at the time of SA20 described above, and “k-th VELR”
“eg” is velocity data of the k-th VEL Reg after the kReg is counted up in SA26.

If the value of the velocity data of the k-th VEL Reg is equal to or higher than the velocity data of A, the processing of SA29 and SA30 is not executed.
Proceed to SA31. On the other hand, the k-th VEL Reg
Is smaller than the velocity data of A, the velocity data of the k-th VEL Reg is stored in A (SA29), and the value of k Reg is set in B Reg (SA30). Therefore,
A Reg is updated every time the determination of SA28 is NO, stores the minimum velocity data, and B Reg
“Reg” stores a value indicating the order of the velocity data stored in the AReg in the VEL Reg. It should be noted that the determination of SA28 is all Y until k = 8.
In the case of ES, A Reg holds the velocity data stored in SA20 as it is,
B Reg also holds k set in SA21 as it is.

When k = 8 in SA31, SA
Proceeding to S32, the processes in SA32 to SA36, which are the same processes as those in SA48 to 52 described above, are executed. As a result, the generation of a new tone signal is assigned to the B channel of the sound source 6, and the B channel is assigned the Bth S
The generation of a tone signal having the tone indicated by the key number i copied to the C Reg and the volume and tone according to the velocity data copied to the B-th VEL Reg in SA33 is started.

However, as a result of the generation of a new tone signal being assigned to the B channel, the tone generated by the B channel is forcibly muted. However, in this silenced tone,
According to the determination at SA28, the tone generated by the velocity data having the minimum value, and the velocity data having the minimum value is a musical tone from a key played by the player weakly. It is considered that the influence on the musical expression expression and the performance expression of the player is small. Therefore,
Forcibly silences sounds that have little effect on musical expression and performance expression,
By generating a musical tone corresponding to a new key press, it is possible to allocate to a limited number of channels 0 to 7 without ignoring the importance of the sound in the composer's musical expression and the performer's musical expression. it can.

On the other hand, when the determination is made at SA18 in FIG.
If all the bits of F Reg are 0, that is, if all channels have passed the predetermined time T from the time of assignment, the process proceeds from SA18 to SA37 in FIG. 6 to reset h Reg to 0. H-th OP
Reg contents are stored in A Reg and BR
The value of h Reg is set in eg (SA38), and it is determined whether the h-th bit of TL Reg is ON or not (SA39). If the h-th bit of TL Reg is OFF, the value of h Reg is counted up (SA
40), it is determined whether or not the value of h Reg has reached 8 (SA41). When the value of h Reg is 8,
The process from SA10 in FIG. 4 is continued, and if it is not 8, the process from SA38 is executed.

Here, the TL used to determine SA39 is used.
Reg indicates the channel in use by turning on each bit as described above.
Is YES, the channel h is in use. In such a case, proceed from SA39 to SA42,
After the value of h Reg is counted up, TLR again
It is determined whether the h-th bit of eg is ON (SA)
43). If it is not ON, it is determined whether or not the value of h Reg has become 8 (SA47), and if not, the processing from SA42 is executed again.

As described above, when the value of h Reg is counted up in SA42 and the determination of SA43 is performed, the h-th bit of TL Reg is turned on in SA43.
When it is detected that “A”
≦ hth OP Reg ”is determined. here,
“A” is the output level from the channel h previously stored in A Reg at the time of SA38 to the tone generator 7, and “h-th OP Reg” is the h-th OP Reg of the h-th OP Reg after counting up in SA 42. Output level value.

If the output level value of the h-th OP Reg is equal to or higher than the output level of A, SA45 and S45
The process proceeds to SA47 without executing the process of A46. On the other hand, the output level value of the h-th OP Reg is A
Is smaller than the output level of the h-th OP
The output level of Reg is stored in A (SA45), and h R
The value of eg is set to B Reg (SA46). Therefore, A Reg is updated each time the determination of SA44 is NO, and the minimum output level is stored. B Reg is the output level stored in A Reg, which is OP Reg. Is stored. Note that, by the time SA = 8, SA44
Are all YES, the output level value stored in SA38 is held as it is for A Reg, and the h set in SA38 is also held for B Reg as it is.

When h = 8, SA47 to S
The process advances to A48 to execute the above-described processes of SA48 to S52. As a result, the generation of a new tone signal is assigned to the B channel of the sound source 6, and the B channel is
48 is the pitch indicated by the key number i copied to the Bth SC Reg, and SA49 is the BEL VEL Reg
The generation of a tone signal of a volume and a tone according to the velocity data copied to is started. In addition, as a result of the generation of the new tone signal being assigned to the B channel, the tone generated by the B channel is forcibly muted.

FIG. 9 is a block diagram showing the overall structure of an electronic musical instrument to which the second embodiment of the present invention is applied. The maximum level detection circuit 11 is provided without providing the touch velocity detection circuit 5 (FIG. 1). Only the differences from the first embodiment are the same as in the first embodiment. This maximum level detection circuit 1
1 detects the maximum level of the tone signal output from each channel of the sound source 6 to the tone generation circuit 7 and inputs it to the CPU 1.

The configuration of various registers is the same as that of the first embodiment with respect to the register shown in FIG. 2, but the register shown in FIG. 12 is used instead of the register shown in FIG.
In the register shown in FIG. 12, SC (0) R
eg ~ SC (7) Reg, TIMER (0) Reg ~
TIMER (7) Reg, OP (0) Reg ~ OP
(7) The use of Reg is the same as in the first embodiment.
However, VEL (0) Reg-V used in the first embodiment
Instead of EL (7) Reg, LEV (0) Reg ~ L
EV (7) Reg is used. This LEV (0)
Reg to LEV (7) Reg stores the maximum level of the tone signal output from the channels 0 to 7 of the sound source 6 and output to the tone generator 7 detected by the maximum level detector 11.

In the processing procedure executed by the CPU 1 in the second embodiment, in each step of the flowcharts shown in FIGS.
It is executed with the configuration replaced with Reg. In the flowchart of this configuration, by executing SA18 to SA36 in FIG. 5, when all the channels are in use, the maximum level becomes the highest based on the level value of the tone signal within the predetermined time T from the assignment. Channel B that is generating a small tone signal is selected, and generation of a new tone signal is assigned to the selected channel B. Further, as a result of the generation of a new tone signal being assigned to the B channel, the tone generated by the B channel is forcibly muted. However, the tone to be silenced is a tone generated at the minimum output level according to the determination of SA28, and is a tone played weakly by the player. The influence on the performance expression of the player is reduced.

FIG. 11 is a block diagram showing the overall structure of an electronic musical instrument to which the third embodiment of the present invention is applied. The differential value detecting circuit 12 is provided without the touch velocity detecting circuit 5 (FIG. 1). Only the point provided is different from that of the first embodiment, and other configurations are the same. This differential value detection circuit 12
Detects the differential value of the volume level of the tone signal output from each channel of the sound source 6 to the tone generation circuit 7 and detects the maximum level of the tone signal output to the tone generation circuit 7 because it is input to the CPU 1. , To the sound source PU1.

The configuration of various registers is the same as that of the first embodiment for the one shown in FIG. 2, but the register shown in FIG. 10 is used instead of the one shown in FIG.
In the register shown in FIG. 10, SC (0) R
eg ~ SC (7) Reg, TIMER (0) Reg ~
TIMER (7) Reg, OP (0) Reg ~ OP
(7) The use of Reg is the same as in the first embodiment.
However, VEL (0) Reg-V used in the first embodiment
DIF (0) Reg ~ D instead of EL (7) Reg
IF (7) Reg is used. This DIF (0)
Reg to DIF (7) Reg stores the differential value of the volume level of the tone signal output from the channels 0 to 7 of the sound source 6 to the tone generator 7 detected by the differential value detection circuit 12.

The processing procedure executed by the CPU 1 in the third embodiment is as follows. In each step of the flowcharts shown in FIGS.
And, in SA28 of FIG.
It is executed with the changed configuration. In the flowchart of this configuration, by executing SA18 to SA36 in FIG. 5, when all the channels are in use, based on the differential value of the volume level of the tone signal within the predetermined time T from the time of assignment, Channel B generating a tone signal having the largest differential value of the volume level
Is selected, and generation of a tone signal corresponding to a new key press is assigned to the selected channel B. Further, as a result of the generation of a new tone signal being assigned to the B channel, the tone generated by the B channel is forcibly muted. However, since the tone to be silenced has the largest differential value of the volume level and is rapidly attenuated according to the determination of SA28, the tone for the composer's musical expression and the performer's performance expression is lost. The effect is small.

[0061]

As described above, according to the present invention, the pitch data of the musical tone is used as the musical tone parameter for all the channels.
The channel to which a new tone parameter is assigned is determined depending on the value of the tone parameter while the differential value of the tone and volume level is assigned. At this time, since the value of the tone parameter is an external operation to the performance operator, that is, a value corresponding to the performance operation, the channel to be forcibly assigned depending on the performance operation, that is, the sound to be forcibly muted is determined. Become. Therefore, since the sound to be forcibly muted is determined depending on the performance operation, the influence on the composition expression of the composer and the performance expression of the player is small, and as a result, the composition expression of the composer and the performance expression of the performer are reduced. Can be assigned without ignoring the importance of the sound in.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall structure of an electronic musical instrument according to a first embodiment of the present invention.

FIG. 2 is a diagram showing types of registers used in the embodiment.

FIG. 3 is a diagram showing types of registers used in the embodiment.

FIG. 4 is a flowchart showing a part of a main routine of the embodiment.

FIG. 5 is a flowchart following SA17 of FIG. 4;

FIG. 6 is a flowchart following SA18 in FIG. 5;

FIG. 7 is a flowchart showing a timer interrupt routine of the embodiment.

FIG. 8 is a flowchart showing a SW interrupt routine of the embodiment.

FIG. 9 is a block diagram showing an overall structure of an electronic musical instrument according to a second embodiment of the present invention.

FIG. 10 is a diagram showing types of registers used in the embodiment.

FIG. 11 is a block diagram showing an overall structure of an electronic musical instrument according to a third embodiment of the present invention.

FIG. 12 is a diagram showing types of registers used in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 2 ROM 3 RAM 4 Keyboard 5 Touch velocity detection circuit 6 Sound source 7 Sound generation circuit 11 Maximum level detection circuit 12 Differential value detection circuit

Claims (1)

(57) [Claims] A plurality of performance operators for outputting pitch data of a musical tone and a differential value of a volume level as musical tone parameters to be generated in accordance with an external operation; and a plurality of channels. Musical tone generation instructing means for instructing generation of a musical tone based on musical tone parameters assigned to each channel; and in a state where the musical tone parameters are assigned to all channels of the musical tone generating instruction means, When a new tone parameter is output, the fineness of the volume level included in the assigned tone parameter within a predetermined time before the output of the new tone parameter.
Selecting means for selecting a tone parameter having the largest differential value among the minute values ; assigning a tone parameter output from the performance operator to a vacant channel of the tone generating instruction means; And a allocating means for allocating to the channel to which the musical tone parameter selected by the selecting means is assigned when there is no sound channel.