JPH041358B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an input control device for an electronic musical instrument such as an electronic guitar. This invention relates to an improvement in a device that can reliably perform the action of removing a finger from a fret to muffle sound.

[Prior art] Conventionally, the pitch (fundamental frequency) is extracted from the waveform signal generated by playing a natural musical instrument.
2. Description of the Related Art Various devices have been developed that control sound source devices composed of electronic circuits to artificially produce sounds such as musical tones.

In this type of electronic musical instrument, the input waveform signal is attenuated, and in order to mute the sound accordingly, the level of the waveform is detected, and when this level falls below a predetermined value,
I'm trying to mute the sound.

By the way, when playing a normal guitar, when a sound is produced by pressing a specific fret on the fretboard and plucking the string, the sound is silenced by releasing the finger from the fret. Sometimes. In such a case, even though the volume level has decreased considerably, the strings often continue to vibrate at a predetermined value or higher for some time after this.

For this reason, even though the performer intended to mute the sound, the electronic instrument continues to sound, resulting in a discrepancy from the actual performance, and the sound when the fret is released is the same as the sound of an open string. The pitch of the sound is different from the sound before the fret is released, resulting in an undesirable change in the sound when playing.In addition, the pitch (fundamental frequency) of the sound when the fret is released continues to be extracted. However, unnecessary processing is performed. In order to solve the above-mentioned problems in electronic musical instruments, we focused on the fact that the peak value of string vibration suddenly decreases when you take your finger off the fret. There is also a system that issues a mute instruction when the detected peak value becomes smaller than the value attenuated at a predetermined rate by a predetermined value (Utility Model No. 56-164294)
Publication No.).

[Problems with the prior art] In the method described in the above publication, the attenuation of the maximum peak value and the minimum peak value of the input waveform signal, each of which exceeds a predetermined value, is checked, and one of the peak values is determined to be a predetermined value. The configuration is such that a mute instruction is given when the sound has attenuated more than that.

Although such a configuration can eliminate the above-mentioned disadvantages of the conventional technology to some extent, since the waveform of an actual natural musical instrument changes complexly, it may be possible for only one peak value to attenuate more than a predetermined value. Even if shown, the entire waveform (maximum peak - minimum peak) does not necessarily indicate large attenuation.

Therefore, in the case described in the above-mentioned publication, there is a high risk that a mute instruction is suddenly given at a timing contrary to the user's intention from a normal sound production state, and the musical tone is muted.

[Object of the Invention] It is an object of the present invention to provide an input control device for an electronic musical instrument as described above, in which the operation of removing a finger from a fret to mute the sound can be performed without error.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides that both the maximum peak value and the minimum peak value of an input waveform signal are attenuated by a predetermined value or more from the previous maximum peak value and minimum peak value, respectively. The main point is that the instruction to mute the musical tone is issued only after the detection of the tone.

[Example] The following example in which the present invention is applied to an electronic guitar will be described with reference to the drawings.

Overall circuit configuration Figure 1 shows the overall circuit configuration of the same embodiment. Signals from the six input terminals 1 are connected to each of the six strings strung on the electronic guitar body.
This signal comes from a pickup that converts string vibrations into electrical signals.

The musical tone signal from the input terminal 1 is amplified by each amplifier 2 in the pitch extraction circuits P1 to P6 (the figure shows the internal configuration of only the first string P1), and then passed through a low-pass filter. (LPF) 3... cuts high frequency components and extracts the basic waveform, and maximum peak detection circuit (MAX)
4..., minimum peak detection circuit (MIN) 5... and zero cross point detection circuit (Zero) 6... The cutoff frequency of the low-pass filter 3 is set to 4f, which is four times the vibration sound frequency f of the open string of each string. This is based on the fact that the frequency of the output sound of each string is within two octaves. In the maximum peak detection circuit 4..., the maximum peak point of the musical tone signal is detected, and at the rising edge of the detection pulse signal, the Q output of the flip-flop 14... connected to the subsequent stage becomes High level, and the Q output of the flip-flop 14... is connected to the subsequent stage. The AND output between the output and the inverted output of the inverter 30 of the zero-cross point detection circuit 6 is sent to the CPU 1 as interrupt command signals INT _a1 to INT _a6 via the AND gate 24...
00, and similarly the minimum peak detection circuit 5...
...However, the minimum peak point of the musical tone signal is detected, and at the rising edge of the detection pulse signal, the Q output of the flip-flop 15 connected to the subsequent stage becomes High level, and the output of this flip-flop 15 ... and the zero-crossing point detection circuit The AND outputs with the outputs of 6... are given to the CPU 100 as interrupt command signals INT _b1 to INT _b6 via AND gates 25 .

That is, when the maximum peak point is detected and the flip-flop 14 is at a high level, when the waveform crosses from positive to negative, an interrupt command signal is generated.
INT _a1 to INT _a6 are given to the CPU 100, and conversely, the minimum peak point is detected and the flip-flop 15 is
When the waveform changes from negative to positive while at High level, interrupt command signal INT _b1 ~
INT _b6 is input to CPU100.

Immediately after receiving these interrupt command signals, the CPU 100 issues a clear signal CL _a1 to the corresponding flip-flops 14..., 15...
~CL _a6 , CL _b1 ~CL _b6 are generated and reset.
Therefore, no matter how many times the zero cross point is passed until the next maximum peak point or minimum peak point is detected, the corresponding flip-flops 14, 15, etc. will remain in the reset state, so no interrupt will be applied to the CPU 100. Become.

Then, in the CPU 100, an interrupt command signal INT _a1 to _{INT a6} or
INT _b1 to _{INT b6} are given to generate a scale tone according to at least one of the respective time intervals. Incidentally, at the start of sound generation, the generation of scale tones of open strings may be started, and the frequency may be corrected after pitch extraction. The operation at the time of starting the sound generation will be described later.

The above-mentioned time interval is determined using the counter 7 and the work memory 101, as will be described later. That is, the work memory 101 stores various data such as the count value of the counter 7 at the zero cross point immediately after the maximum peak point or immediately after the minimum peak point.

After the start of sound generation, the frequency of the musical tone being generated is variably controlled in accordance with the time interval data determined in sequence. That is, data specifying a musical scale is sent from the CPU 100 to the frequency ROM 8, and as a result, frequency data indicating the corresponding frequency is read out and sent to the sound source circuit 9 to generate a musical tone signal, which is output from the sound system 10. Ru.

Further, the musical tone signal from the low-pass filter 3... is given to the A/D converter 11...
It is converted into digital data according to the waveform level.

The output of this A/D converter 11... is latched into a latch 12.... This latch 1
The latch signal for 2... is the output of the flip-flop 14..., 15... from the OR gate 13.
It is generated by passing through the maximum peak point or the minimum peak point, and the latch 12 is generated each time the maximum peak point or minimum peak point is passed.
A signal indicating the level of the waveform at that time is stored. Further, the latch signals L ₁ to L ₆ from the OR gates 13 . . . are also given to the CPU 100.

Then, the latch 12...output is given to the CPU 100, and the start and stop of sound generation, as well as control of the output level (volume) of the output sound, etc., are performed in accordance with this data. Note that the peak values stored in the latch 12 are sequentially written into the work memory 101.

That is, in the CPU 100, the A/D converter 1
1. When the absolute value of the data indicating the waveform level given by ... exceeds a predetermined constant value, the generation of musical tones is started and pitch (fundamental frequency) extraction is also started, and this data is set to a constant value. When the following occurs, issue a mute instruction and end the sound emission. The details of the operation will be described later.

In addition, in FIG. 1, the A/D converter 11 is
Although the pitch extraction circuits P1 to P6 are provided independently, it is of course possible to use one A/D converter in a time-division manner.

The frequency ROM 8 and the tone generator circuit 9 form a musical tone generation system of at least 6 channels by time-division processing.

In addition, FIG. 2 shows a time chart of signal waveforms at various parts in the pitch extraction circuit P1. The output of is the output of the zero crossing point detection circuit 6,
are interrupt command signals INT _a1 to INT _a6 and are interrupt command signals INT _b1 to _{INT b6} .

Operation Next, the operation of this embodiment will be explained. FIG. 3 shows the flow of the interrupt routine of the CPU 100, and FIG. 4 shows the main flow. Although Figures 3 and 4 only show the processing for one string, the processing for all strings is exactly the same, so if we consider that the CPU 100 executes the processing for each string in a time-sharing manner, good.

Registers in Work Memory 101 Now, before explaining the specific operation of the CPU 100, the main registers in the work memory 101 will be explained.

The FLAG(i) register has a maximum peak value or minimum peak value greater than each previous peak value, which will be described later.
If it is smaller than the OFFLEV level value,
Among the registers that are set to ``1'', FLAG(1) is for the maximum peak and FLAG(2) is for the minimum peak, and when both registers are set to ``1'',
The silencing process is executed even if both peak values are not lower than OFFLEV.

The STEP register takes four stages of 0, 1, 2, and 3, and as the string vibrates as shown in Fig. 5a or 6a, it changes as shown in Fig. 5b or 6b. Its contents change. When this STEP register is 0, the peak value of the waveform will be explained later.
This is a no-off (silence) state in which the value is below OFFLEV, and when it is 3, the peak value of the waveform is smaller than the previous peak value by more than the level value of OFFLEV, and the no-off (silence) command is output. When the state is 1 or 2,
This is when the sound is being emitted normally.

Data representing the measured period is input to the PERIOD register, and based on the contents of this register, the CPU 100 selects the frequency ROM 8, the sound source circuit 9,
frequency control.

The T register stores the value of the counter 7 at a specific point for measuring the period of the input waveform. Note that the counter 7 performs a free running operation in which it counts at a predetermined clock.

The SIGN register indicates whether the zero-crossing point for period measurement is the zero-crossing point next to the maximum peak (MAX) point or the zero-crossing point next to the minimum peak (MIN) point. The latter is the case.

The AMP(i) register is a register that stores the maximum or minimum peak value (actually the absolute value) latched from the A/D converter 11 to the latch 12. AMP(1) is for the maximum peak, AMP(2) is for the maximum peak. is the register for the minimum peak.

Furthermore, as will be described later, this embodiment uses four constants (threshold levels) for various judgments.
is set in the CPU 100.

The first one is ONLEV, as shown in Figure 5a.
As shown in FIG. 3, when the current note-off state is detected and a peak value larger than the value of ONLEV is detected, the CPU 100 assumes that the string has been picked, etc., and starts executing an operation for period measurement.

ONLEV is in the note-on state (sounding) and if the difference between the current detection level and the previous detection level is greater than this value, it is assumed that an operation such as tremolo has been performed and the sound starts again (relative on). , relative on) processing.

OFFLEV is, as shown in Figure 6a,
If a peak value below this value is detected while the note is on (sounding), the note will turn off (mute).
Process.

OFFLEV is, as shown in Figure 6a,
If the note is on (currently sounding) and the difference between the current peak value and the previous maximum or minimum peak value is smaller than this value, a mute operation was performed by removing the finger from the fret. This is for performing sound silencing processing.

From the above explanation, it will be easy to understand the operations of the interrupt routine and main routine described below.

Interrupt processing at zero cross point Now, the interrupt command signals INT _a , INT _b which are the output of AND gate 24 or AND gate 25
When the interrupt occurs at the CPU 100, the interrupt processing shown in FIG. 3 is performed.

That is, when the interrupt command signal INT _a is input,
First, step _P1 is processed, and a in the CPU 100 is
When the register is set to 1 and the interrupt command signal INT _b is input, 2 is first set to the a register by the process of step _P2 .

Then, in step _P3 , CPU100
The value of counter 7 is preset in the t register in the t register. In the next step _P4 , the peak level data of the A/D converter 11 is latched 12.
, and set it in the b register in the CPU 100.

Then, in step _P5 , flip-flop 14 or flip-flop 15 is cleared.

At the subsequent step _P6 , the contents of the a, b, and t registers are transferred and stored in the work memory 101, and the interrupt processing is ended.

Main processing In the main routine (Figure 4), first, in steps _S1 to _S3 , the FLAG(1), FLAG(2), and STEP registers are cleared, and then in step _S4 , the above-mentioned interrupt is cleared. The work memory 101 is
Check whether the contents of a', b', and t' (shown as a', b', and t' because they are the same as a, b, and t above and were recorded last time) have been written. However, if no interrupt processing is being performed, the determination is NO and this step _S4 is repeatedly executed.

If YES is determined in step _S4 above, the process proceeds to the next step _S5 and the contents a', b',
Read t′. Next, in step _S6 , the above
The peak value of the same type (i.e. maximum or minimum) peak point stored in the AMP (a′) register
The peak value b' extracted this time is read into the c register in the CPU 100 and set in the AMP (a') register.

Next, in steps _S7 to _S9 , it is checked whether the contents of the STEP register are 1, 2, or 3, respectively. If we are in the initial state now,
Since the STEP register is 0, steps S ₇ , S ₈ , S ₉
In both cases, the judgment is NO. Then, in the next step _S10 , the peak value b′ detected this time is
Check whether it is greater than ONLEV.

If the judgment in step _S10 is NO,
Since the pronunciation start process has not yet been performed, the process returns to step _S4 . If an input larger than ONLEV is given from the low-pass filter 3 as shown in FIG. 5a, the judgment in step _S10 would be YES,
Proceed to step _S11 .

In step _S11 , 1 is set in the STEP register.
Then, in step _S12 , the value a' (that is, 1 when the zero cross point is immediately after the maximum peak point, and 2 when the zero cross point is immediately after the minimum peak point) is input into the SIGN register.

Then, in step _S13 , the value of t', that is, the time of zero cross point Zero1, is set in the T register.

In this way, the contents of a' (1 in the case of a in Figure 5) are stored in the SIGN register, the contents of b' are stored in the AMP(1) register, and the contents of t' (zero crossing point as described above) are stored in the SIGN register.
Zero1 time) is set in the T register. Then, return to step _S4 again.

This completes the processing of the main routine immediately after the zero cross point Zero1 in FIG. 5a. Now, next, in the main routine processing immediately after the zero cross point Zero2, the data set processing in steps _S4 to _S6 is executed, a YES decision is made in the next step _S7 , and the process proceeds to step _S14 . go.

Now, as shown in Figure 5a, when the input waveform is given with a rising edge (that is, changing in the positive direction),
The SIGN register is set to 1, and this time the negative peak point, that is, the minimum peak point, has been passed through, so the a' register is set to 2, and this step
In _S14 , a NO judgment is made and the process returns to step _S4 without any processing.

Next, when the zero cross point Zero3 arrives, steps S ₄ to S ₇ and S ₁₄ are executed again, and this time
A YES judgment is made in _S14 , and the process proceeds to step _S15 .
As shown in Figure 5b, the contents of the STEP register are set to 2.
Then, in the next step _S16 , subtract the time of zero cross point Zero1 in the T register from the current interrupt time in the t' register, and calculate the difference, which is the length shown in Figure 5c, or a value that is one cycle of the waveform.
Store in PERIOD register.

Next, the process goes to step _S17 , where the contents of t' are transferred to the T register and a new cycle measurement is started. In step _S18 , a note-on instruction is given so that the tone generator circuit generates a musical tone with a frequency corresponding to the contents of the PERIOD register, as shown in FIG. 5d.
The sound will start from this timing.

Now, the next zero cross point Zero4 (see Figure 5 a)
In _the main routine processing immediately after
~ _S8 is executed, and in step _S8 , the content of the STEP register is 2, so it is determined as YES, and then the process goes to step _S19 , where the value of b' becomes OFFLEV (Fig. 6a).
), and the peak level is still large, so in this step _S19
Decide YES and proceed to step _S20 .

In step _S20 , a decision is made as to whether or not to perform relativeon processing. That is, it is determined whether the current peak value b' is larger than the previous peak value c by ONLEV, that is, whether the extracted peak value suddenly increases during sound generation.

Normally, when you vibrate a string, it naturally damps.
At step S ₂₀ , either a NO judgment is made, or if the string is operated again before the previous string vibration has finished damping due to tremolo playing, etc., this step is performed.
The judgment of S ₂₀ may be YES.

In this case, jump from step S ₂₀ to step S ₁₁ , execute steps S ₁₂ and S ₁₃ , and
The STEP register becomes 1, and from then on, exactly the same operation as that at the start of sound generation described above is executed. That is, then the steps S ₇ →S ₁₄ →S ₁₅ →S ₁₆ →S ₁₇ →S ₁₈
Executes the pronunciation start process and performs the re-pronunciation process. At this time, re-sounding with the attack part is started.

Now, in the normal state, following step _S20 , the process goes to step _S21 , and it is determined whether the current peak value b' is smaller than the previous peak value c by OFFLEV, or in other words, a muting operation is performed by removing the finger from the fret during sound production. I wonder if it's true or not.

Here, if the finger is still pressing the fret, the judgment of NO is made in this step _S21 ,
At step _S22 , the FLAG (3-a') register is cleared. 3-a' indicates the FLAG register for the peak point on the opposite side of the previous peak point, and if the current moment is a' = 1 and the zero cross point immediately after the maximum peak point, FLAG (2) on the minimum peak point side is cleared. If the current point is a' = 2 and the zero cross point immediately after the minimum peak point, FLAG(1) on the maximum peak point side is cleared. Since it is now the zero cross point Zero4 immediately after the minimum peak point, FLAG(1) will be cleared.

Next, in step _S23 , the CPU 100
Check whether the contents of the SIGN register and the a' register match. Since the current zero crossing point is Zero4, the SIGN register is 1 and the a' register is 2, so in this step _S23 , make a NO change.
Return to step S ₄ .

When the next zero cross point Zero5 is detected, steps S ₄ to _{S 8} and S ₁₉ to _{S 23} are executed, and in step S ₂₃
Make a YES judgment, perform steps _S24 , _S25 , and _S26 , set a new period, that is, the time from Zero3 to Zero5, in the PERIOD register, transfer the contents of t' to the T register, and write a new period. The frequency ROM 8 and the sound source circuit 9 are started according to the pitch detected this time in the above PERIOD register.
Instructs the user to change the frequency.

Now, if we perform a mute operation by removing our finger from the fret, the maximum and minimum peak values will start to decrease, as shown in Figure 6a, and the difference between each current peak value and each previous peak value will increase. but
It becomes smaller than the value of OFFLEV. Then,
The CPU 100 executes steps S ₄ to _{S 8} and S ₁₉ to _{S 21} , determines YES in step S ₂₁ , and executes steps S 4 to S 8 and S 19 to S 21.
In step _S27 , d=3-a', which indicates the peak point on the opposite side to the previous peak point, is obtained, and in step _S28 , this d
Determine whether FLAG(d) on the corresponding side is 1 or not.

Now, both FLAG(i) registers are still 0, so proceed to step _S29 , set the FLAG(a') register on the previous peak point side to 1, and proceed to step S29.
Return to _S4 .

Subsequently, when passing through the peak point on the opposite side and reaching the next zero crossing point, the CPU 100 performs the above-mentioned steps S ₄ to _{S 8} and S ₁₉ to _{S 21} and then returns to step S 4 .
FLAG(i) for opposite peak points at S ₂₇ and S ₂₈
Check whether the register is set to 1 or not.

This time it is 1, so steps S ₃₀ and S ₃₁
Clear the FLAG(i) register on the other side of this,
The value of the STEP register is set to 3, note-off processing is performed in step _S32 , and the tone generator circuit 9 is configured to stop generating the musical tone that has been output from the tone generator circuit 9 up to that point.
instruct.

In this way, no further musical tones will be emitted,
By removing the finger from the fret, the sound can be surely muted, and the pitch extraction processing in steps _S24 to _S26 can be omitted.

In this case, as shown in FIG. 7, if only one peak level becomes smaller than OFFLEV, one of the FLAG(i) registers is set to 1 in steps _S21 , _S27 to _S29 . In the next step _S21, the determination process of whether the peak level has become smaller than OFFLEV or not is determined as NO, so the above value is set to 1 in step _S22 .
The FLAG(i) register is cleared, and the sound generation continuation processing in steps _S23 to _S26 continues.

To summarize above, in the case of Figure 6, the steps
For S ₂₁ , S ₂₇ to S ₂₉ , one peak level
Since the value is less than OFFLEV, flag setting processing is performed first, followed by step _S21 .
At S ₂₇ , S ₂₈ , S ₃₀ ~ _{S 32} , the other peak level is also
Silence processing is performed only when the value becomes lower than OFFLEV. On the other hand, in the case of FIG. 7, in steps S ₂₁ and S ₂₇ to _{S 29} , flag setting processing is performed first because one of the peak levels has fallen below OFFLEV, but in steps S ₂₁ and S ₂₂ And the other peak level is
Since the value does not fall below OFFLEV, the above flag is cleared and the process continues from step _S23 to
The sound generation continuation process of _S26 continues.

In this way, after the STEP register becomes 3 and the sound is muted, the CPU 100
After steps _S1 to _S8 , a YES determination is made in step _S9 , and a check is made in step _S33 to see if the peak level value b' has become less than OFFLEV. Immediately after the STEP register reaches 3, the peak value has not fallen below OFFLEV, so proceed to step _S36 , and as in step _S20 above, decide whether or not to perform relative-on processing. peak value
If b' is greater than the previous peak value c by ONLEV, the sound generation start process of steps _S11 to _S13 is performed, and if it is smaller, the process returns to step _S4 .

Then, when the peak value becomes lower than OFFLEV, a NO judgment is made in step _S33 .
In step _S34 , the contents of the STEP register are also cleared to 0.

Also, in the normal sound generation state when the STEP register is set to 2, if the peak value becomes lower than OFFLEV, a NO judgment is made in step _S19 .
Next, the program goes to step _S35 , where the contents of the STEP register are set to 0, and note-off processing is performed at step _S36 , stopping the generation of musical tones that have been output from the tone generator circuit 9 up to that point.

Note that the value of OFFLEV used to mute the sound when the finger is removed from the fret may be a constant value, or may be a value obtained by multiplying the previous peak value by a constant ratio. In addition, in the above example, the pitch between each zero cross point was measured, but what kind of pitch is measured between the maximum peak point and the zero cross point, between the minimum peak point and the zero cross point, between the maximum peak point and the minimum peak point, etc. The period may be measured, and in such a case, a signal from the maximum peak detection circuit 4 or the minimum peak detection circuit 5 may be used as the interrupt command signal INT. In that case, exactly the same result can be obtained. In addition, the same processing as described above may be performed, for example, by detecting a zero-crossing point immediately before a peak point. In addition, the method of determining the reference points can be changed in various ways.

Further, in the above embodiment, each process is executed in the main flow, but similar processes may be executed in the interrupt process.

Further, in the above embodiment, the present invention is applied to an electronic guitar, but the present invention is not necessarily limited to this.As shown in FIG. If the intended purpose is to perform pitch extraction from the audio signal or electrical vibration signal input from a microphone, etc., an acoustic signal different from the original audio signal can be extracted at the corresponding pitch or scale frequency. Any type of system may be used as long as the system generates the information. Specifically, the invention can be similarly applied to instruments with keyboards, such as electronic pianos, electronic wind instruments, and electronic string instruments, such as violins and kotos.

[Effects of the Invention] As described in detail above, the present invention provides that if both the maximum peak value and the minimum peak value of the input waveform are smaller than the previous maximum peak value and minimum peak value by a predetermined value or more, Since we now have a mute instruction, you can reliably mute the sound by removing your finger from the fret, and there will be no sound that is different in pitch from the sound before you release the fret. In addition to making it possible to perform a performance closer to that of a natural instrument, this also has the effect of eliminating pitch (fundamental frequency) extraction from being wasted even after the finger is removed from the fret.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the overall circuit configuration of an input control device for an electronic musical instrument, which is an embodiment to which the present invention is applied.
Figure 2 is a time chart showing the waveforms appearing in each part of Figure 1, Figure 3 is a flowchart of the CPU interrupt routine, and Figure 4 is a time chart showing the waveforms appearing in each part of Figure 1.
Figure 5 is a time chart showing the flowchart of the main routine of the CPU, Figure 5 is a time chart showing the operation at the start of sound generation, and Figure 6 is a time chart showing the operation when muting by removing your finger from the fret. 7 is a time chart showing the operation when the sound is not muted even if there is a fluctuation in the peak value of the waveform. 1...Input terminal, 4...Maximum peak detection circuit,
5... Minimum peak detection circuit, 6... Zero cross point detection circuit, 7... Counter, 9... Sound source circuit, 1
2...Latch, 14, 15...Flip-flop, 100...CPU, 101...Work memory,
P1 to P6... Pitch extraction circuit.

Claims (1)

[Claims] 1. Detection means for detecting the maximum peak value and minimum peak value of an input waveform signal, and both the maximum peak value and minimum peak value detected this time by this detection means are the same as those detected previously. a determining means for determining whether or not the maximum peak value and the minimum peak value are smaller than a predetermined value, respectively; An input control device for an electronic musical instrument, comprising: a mute instructing means for instructing to mute a musical tone that is being played.