JPS63261391A - Input controller for electronic musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, and particularly relates to an input control device for starting musical tones more accurately.

[Background of the Invention] Conventionally, pitches (fundamental frequencies) are extracted from waveform signals generated by playing a natural musical instrument, and a sound source device composed of an electronic circuit is controlled to artificially produce sounds such as musical tones. Various types of devices have been developed.

In this type of electronic musical instrument, it is common to extract the pitch of an input waveform signal and then instruct the sound source device to generate a scale tone corresponding to the pitch.

The present application has been filed in order to enable re-sounding when a picking operation is performed on such an electronic musical instrument when a performance operation such as tremolo is performed, that is, when a musical tone is being produced by string vibration. If a person detects that the level of the input waveform signal has suddenly increased while a musical tone is being generated, the user issues a command to start generating the tone again and turns on the relative signal (r
An application was filed for a device that was able to follow the actual performance operations by performing elation) processing and changing the volume, tone, etc. (Japanese Patent Application No. 61-285985)
.

However, when the input waveform signal rises during normal performance, rather than the tremolo playing method described above, the waveform is not stable.
The level of the input waveform signal may increase rapidly several times.

For example, the rising edge of the input waveform may be as shown in Figure 7(a), but in this case, even though the sound generation is started at the rising edge of the aO waveform, even the a3 waveform that immediately follows it is not the same. Because the waveform level is suddenly higher than the waveform level of a2, the above-mentioned lative-on (re-sounding) process is performed, and even though the picking operation is only one time, the sounding start process is performed multiple times. There was a problem that this was done.

[Purpose of the Invention] This pronunciation II was made in consideration of the above-mentioned 23. It clearly distinguishes between repronunciation according to tremolo playing technique and normal pronunciation, and makes the start of pronunciation of musical tones more accurate. It is an object of the present invention to provide an input device a for an electronic musical instrument that is capable of performing the following functions.

[Summary of the Invention] In order to achieve this object, the present invention provides a sound generation start command when the input waveform signal exceeds a predetermined value,
If the input waveform signal suddenly increases even after a musical tone is generated, the sound generation start command is given again. The main point is that the instruction to start pronunciation is not given again.

[Embodiment] Hereinafter, an embodiment in which the present invention is applied to an electronic guitar will be described in detail with reference to the drawings.

In this embodiment, as explained below, step 5r-
Fifth, the CPU 100 that executes steps 316 to 321 uses an amplifier 2, a low-pass filter 3, a maximum peak detection circuit 4, a minimum peak detection circuit 5, a zero cross point detection circuit 6, an A/D converter 11, a latch 12, and an OR gate. 1
3.7 Lip-flop 14.15 is the detection means, and the CP executes step 523, S8 to S++, Sob to S month.
U100 corresponds to a control means, the CPU 100 that executes steps S33 and S34 corresponds to a measurement means, and the CPU 100 that executes step S32 corresponds to a prohibition means.

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

The musical tone signals from the input terminals 1, . . . are sent to the respective amplifiers 2, .
It is amplified by... and low pass filter (LPF) 3...
The high frequency component is cut and the basic waveform is extracted, and the maximum peak detection circuit (MAX) 4..., the minimum peak detection circuit (MIN) 5... and zero cross point detection are performed. It is given to the circuit (Zero) 6... The cutoff frequency of the low-pass filter 3 is set to 4f, which is four times the vibration sound frequency af 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. The maximum peak detection circuit 4... detects the maximum peak point of the musical tone signal, and at the rising edge of the detection pulse signal, the Q output of the flip-flop 14 connected to the subsequent stage becomes Hi. gh level, this flip-flop 14
Output of ...... and zero cross point detection circuit 6...
The AND output with the inverted output of the inverter 30... is sent to the CPU 100 as the interrupt command signal lNTa+~INTab via the AND gate 24...
Similarly, the minimum peak detection circuit 5...
However, when the minimum peak point of the musical tone signal is detected, 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 this flip-flop 15... ... and the output of the zero-crossing point detection circuit 6... are given to the CPU 100 as interrupt command signals lNTb+ to lNTb6 via AND gates 25....

That is, the maximum peak point is detected and the flip flow, P1
4 is at High level and the waveform crosses from positive to negative, the interrupt command signal I N Ta+ ~ I
N Tab is given to the CPU 100, and conversely, when the minimum peak point is detected and the clip flop 15 is at a high level, when the waveform changes from negative to positive, the interrupt command signals lNTb+ to lNTb6 are sent to the CPU 100.
Enter.

Immediately after receiving these interrupt command signals, the CPU 100 activates the corresponding flip-flops 14...
Clear signal CLa+- for ..., 15...
Generate and reset CLab, CLb+-CLbb. 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...
・ is in a reset state, so no interrupt is applied to the CPU 100.

Then, the CPU 100 receives an interrupt command signal lNTa+ to INT'ab or lNTb+ to rNTbb based on the vibration output of the string, and generates a scale tone according to at least one of the respective time intervals. Incidentally, at the time of starting sound generation, the generation of open string scale tones may be started and the frequency may be corrected after pitch extraction.The operation at the time of starting 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 sound generation starts, the frequency of the musical tone being generated is variably controlled according to the time interval data determined sequentially.
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 as a sound from the sound system IO.

The musical tone signals from the low-pass filters 3, . . . are applied to the A/D converters 11, . . ., and converted into digital data according to the waveform level thereof.

The outputs of the A/D converters 11... are latched by the latches 12.... The latch signal for this latch 12... is generated by the output of the flip-flops 14..., 15... via the OR gate 13...
Each time a maximum peak point or a minimum peak point is passed, a signal indicating the level of the waveform at that time is stored in the latch 12. Also, this orgate 13...
The latch signals Ll-L6 from ... are also given to the CPU 100.

The output from the latch 12 is then given to the CPU 100, and controls such as start and stop of sound generation, and the output level (total amount) of the output sound are performed in accordance with this data. Note that the peak values stored in the latches 12 . . . are sequentially written into the work memory 101.

That is, CP (in Jloo, A/D converter 11...
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 kept constant. When it falls below the value,
Give 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 converters 11 are provided independently in each of the beach extraction circuits PI-P6, but it is of course possible to use - A/D converters in a time-sharing manner. It is.

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.

Furthermore, Figure 282 shows a time chart of the signal waveforms of each part in the pitch extraction circuit PI. Output of circuit 5, ■ is output of zero cross point detection circuit 6, ■ is interrupt command signal rNTa+
~(NTab, ■ is the interrupt command signal lNTb+~rN
It is Tb6.

The operation of this embodiment will now be explained. Figure 3 shows cPU
FIG. 4 shows the flow of the loop interrupt routine, and is the main 70-. Note that this f53 diagram and Figure 4 only show the processing for one string, but since the processing for all strings is exactly the same, it can be assumed that the CPU 100 executes the processing for each string in a time-sharing manner. .

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

The 5TEP register has four stages: 0, 1.2.3,
The string vibrates (Figure 5 (a) or Figure 6 (a))
(see), its contents change as shown in FIG. 5(b) or FIG. 6(b). When this 5TEP register is 0, it represents a note-off (mute) state.

The 5IGN 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. 2, it is the latter.

The REVERSE register is a register that stores data for checking whether interrupt processing has been performed due to the arrival of a zero-crossing point after the peak point on the opposite side of the zero-crossing point represented by the 5IGN register. Used to check pitch (fundamental frequency) extraction 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 7-rerunning operation of counting at a predetermined clock.

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.
is the register for the maximum peak, and AMP(2) is the register for the minimum peak.

The PERIOD register receives pitch data representing the measured period, and based on the contents of this register, the CP
U100 performs frequency control on the frequency ROM 8 and sound source circuit 9.

The W register is a register that is incremented by 1 each period from the start of sound generation, and until rlOJ is reached, even if the current peak level value suddenly becomes larger than the previous peak level value of the input waveform signal, it will not be counted again. It is controlled so that processing for pronunciation is not performed.

Furthermore, as will be described later, this embodiment uses three methods for various judgments.
One constant (threshold level) is CPU100
is set within.

First of all, the first one is 0NLEVr, Fig. 5(a),
As shown in Figure 6(a), when the current note-off state is detected and a peak value larger than the value of 0NLEV I is detected, it is assumed that the string has been picked, etc., and the operation for period measurement is performed. CPU 100 starts execution.

0NLEVn is a note-on (sounding) state,
If the difference between the previous detection level and the current detection level is greater than this value, it is assumed that there was an operation using tremolo playing, etc.
Start pronunciation again (relative on, relative ma e o
n) For processing.

As shown in FIG. 8(a), 0FFLEV is in a note-on (sounding) state, and when a peak value below this value is detected, note-off (mute) processing is performed.

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 Crossing Point Now, when the interrupt command signals INTa and INTA, which are the outputs of the AND gates 24 and 25, arrive at the CPU 100, the RJ interrupt process shown in FIG. 3 is performed.

That is, when the interrupt command signal I N T a is input,
First, the process of step P1 is performed, and the C register in the CPU 100 is set to 1. When the interrupt command signal lNTb is input, the C register is set to 2 by the process of step P2.
Set.

Then, in step P3, t in the CPU 100
Preset the value of counter 7 in the register. In the next step P4, the peak level data of the A/D converter 11 is read from the latch 12, and the CPU 100 reads the peak level data of the A/D converter 11 from the latch 12.
Set in the b register within.

Then, in step P5, the flip-flop 14
Or clear flip-flop 15.

In the following 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.

In the main routine (FIG. 4), in step Sl, the work memory 101 is
The contents of a', b', and t' are shown as a', b', and t' because they are the same as a, b, and t above, and were recorded last time.
It is judged whether or not it has been written, and if no interrupt processing is being performed, the judgment is No, and this step SI is repeatedly executed.

If YES is determined in step SI, the process proceeds to the next step S2 to read out the contents a', b', t'.Next, in step S3, the AMP(a')
The register stores the same type (i.e. maximum or minimum)
The peak value at the peak point of is read to the C register in the CPU 100, and the peak value b' extracted this time is set to the above AMPCa'.
) register.

Next, in steps S4 to S6, it is determined whether the contents of the 5TEP registers are 3.2.1 or not. If this is the first state, the 5TEP register is O, so steps S4, S5, and S6 are all No.
A judgment will be made. Then, in step S7, it is determined whether the peak value b' detected this time is greater than 0NLEVI.

If the peak value b' is smaller than 0NLEVI, the process returns to step S1 since the process of starting sound generation is not yet performed. Suppose that 0NL as shown in Figures 5(a) and 6(a)
If an input larger than EVI is obtained, step S
The determination in step 7 is YES, and the process advances to step S8.

Then, in step S8, the 5TEP register is set to 1, then in step S9, the REVER5E register is set to O, and then in step 51G.

a' (that is, at the zero cross point immediately after the maximum peak point, l
, at the zero cross point immediately after the minimum peak point, set the value of 2) to 5
Input to IGN register.

Then, at step S, the value of t' is set in the T register. As a result, the contents of a' are stored in the 5IGN register (in the case of Figures 5(a) and 6(a), 5IGN becomes l), the contents of b' are stored in the AMP register, and the contents of t' are stored in the T This means that it has been set in the register. Then, the process returns to step S1 again.

Now, with the above explanation, the processing of the main routine immediately after the zero cross point Zero in FIGS. 5(a) and 6(a) is completed.

Now, next, the processing in the main routine immediately after the zero cross point Zero2 will be explained. In that case, step S above
1→S2→S3→S4→S5 data set processing and sound generation stage control processing are executed, and YES in the next step S6.
A determination is made, and the process then proceeds to step 512.

Now, when the waveform changes in the positive direction at the time of input as shown in Fig. 5 (a) and Fig. 6 (a), the 5IGN register is l, and since the peak in the negative direction has passed this time, the a register is is 2, so N.

make a judgment. Incidentally, if a zero cross point arrives immediately after the peak value of the same polarity, a YES determination is made in step SI2 and the process returns to step S1 without any further operation.

Now, in this step S12, the judgment is NO, and the process goes to step SI3, where the 5TEP register is set to 2 (see FIG. 5(b) and FIG. 6(b)).

Then, following step S+3, step 514 is executed to compare the previous peak value (AMP (S IGN)) and the current peak value (b'). Now, as shown in Figure 5(a), the previous value XO is smaller than the current value (xl > Xo)
If so, the answer is YES, and the current time t' is the total period JI.
Step SL to make IBM the starting point (see Figure 5(C))
4 to step 31G.

Execute Sl+, set the 5IGN register to 2, and set t
Transfer the contents of the register to the T register.

Conversely, if the previous peak value is larger than the current peak value, that is, if X)<XO as shown in FIG.
Set the EVER3E register to 1. Note that the 5IGN register now maintains the previous value l. Therefore, in this case, the previous zero cross point (Zerol) is the starting point for period measurement (see FIG. 6(c)).

When the main flow is executed for the first time after passing the first-order zero cross point (Zero3).

A YES judgment is made in step S5, and step 51
Proceed to 6. This time a' is l, and in the case of Figure 5, 5I
When GN is 2 and 6th UgJ, 5IGN is 1, so in the case of FIG. 5, a NO judgment is made in step S16, and the process goes to step 515 and returns to step S1. In other words, the CPU 100 recognizes that the first peak (amplitude X2) has been passed since the start of period measurement.

In the case of FIG. 6, in step 516, Y
After the judgment of S is made, go to step S+7 and REVERS.
Check whether the E register is 1 or not. If it is not 1, a NO judgment is made and the process returns to step S+, but as described above, this register has become 1 by executing step S+5, and the process goes from step Sll to step 518 where the 5TEP register is set to 3 and the 6th U! ! (see J(b))
Then, in step S19, the value in the T register, that is, the time of the zero cross point Zero, is subtracted from the value of the counter 7, which is accepted by the current interrupt, in the T register.
Store in PERIOD register.

In other words, the length shown in FIG. 6(C) is the length of one cycle, and in the subsequent step 520, the contents of t' are transferred to the T register and a new cycle measurement is started.

Then, in step S2I, the CPU 100 uses the contents of the above-mentioned PERIOD register to set the frequency @ROMB,
A sound generation command is issued to the sound source circuit 9, and therefore musical sounds are generated from this point onwards. continue.

The CPU 100 sets the value of the W register to rl in step S33.
Let it be J.

Now, in the case of FIG. 5 described above, in the main flow processing for the next zero cross point (Zero4), the process jumps from step S5 to step 316. now,
Since the 5IGN register is 2, the result is YE in step S16.
After determining S, proceed to step 517→S1 in the same manner as above.
The sound generation start process of 8→319→S20→521→S33 is executed, and this time, the zero cross point Zer shown in FIG. 5(C) is executed.
The CPU 100 recognizes the period from o2 to Zero4 as one cycle, and starts producing a musical tone with a frequency based on this length (see FIG. 5(d)).

In this way, period measurement processing starts from the zero-crossing point next to the peak point with a large value, and ends at the zero-crossing point next to the peak point on the same side as the peak point, and the low-pass filter One period of the waveform of 3 outputs is extracted.

After this sound generation start processing, the main routine proceeds from step S4 to step S22, and checks whether the value of b', which is the peak value acquired this time, exceeds 0FFLEV as shown in FIG. judge.

If this level is currently exceeded, the process advances to step S32, where it is checked whether the value of the W register is greater than or equal to "10".

Since the value of the W register has now become "1", the process jumps to step 324 and compares the contents of a' with the contents of the IIGN register. If they do not match, the process proceeds to S15 and interrupts at the next zero-crossing point. In preparation for processing, if they match, it means that peaks with opposite characteristics (positive/negative peaks) have already been passed, so the process advances to step S25 and the REV
It judges whether the ER5E register is 1 or not, and if it is No, it returns to step Sl without any processing.
If YES is determined in step S25, the process proceeds from step 325 to step S26, and in order to obtain a new period (pitch), the contents of the T register are subtracted from the contents of the t register and set in the PERIOD register.

Then, in step S27, the contents of the t register are changed to T
P is transferred to the register and determined in the subsequent step 328.
The CPU 100 performs frequency a (pitch) control on the frequency ROM 8 and the tone generator circuit 9 based on the value of the ERIOD register.

In other words, in this embodiment, changes in the vibration frequency of the string are detected moment by moment, and frequency control is performed in real time accordingly.

Then, proceeding from step 328 to step 529, R
The next period measurement is performed with the contents of the EVER5E register set to 0, and the value of the W register is increased by 1 in step S3a to become "2.
”, and thereafter, for each period of the waveform, steps S26 to
S29. Perform the pitch extraction control process of S34, and
The value of the register is incremented by 1 in sequence.

Then, when the value of the W register becomes ``10'' or more, the C
The PUIQO proceeds from step S32 to step S23, and judges whether or not to perform relative on processing. That is, specifically, the current peak value (b') is 0 compared to the previous peak value (C).
It is judged whether the extracted peak value is large by NLEVII, that is, whether the extracted peak value suddenly becomes large during sound generation.

Normally, if the string is vibrated, natural damping will occur, so the answer to step S23 is No. However, if the string is operated again before the previous string vibration has finished damping due to tremolo playing, etc. The determination in step S23 may be YES.

In that case, make a YES judgment in step 52ff, jump to step S8, and step S to step S.
11, the preparation process for starting sound production is executed.

As a result, the 5TEP register becomes 1, and the same operation as that at the start of sweating described above is performed thereafter. That is, steps S16 to S21 again. The sound generation start process of S33 is then executed to perform the process of starting the sound again.

Now, suppose that a waveform signal as shown in FIG. 7(a) is input by one picking operation, and at the zero-crossing point immediately after waveform aQ, steps 51 to S-th data set processing and pronunciation stage determination are performed. Process 1 Preparation processing for starting sound generation is performed, and at the zero-crossing point immediately after the primary waveform a1, sound generation start processing in steps S16 to 521, 333 is performed, and thereafter, steps S24 to S29. The pitch extraction control process of S34 will be performed. At this time,
As shown in waveform a3, the waveform is unstable and the level of the fourth waveform from the beginning suddenly increases, and the level of the previous waveform a2
On the other hand, if the level of waveform a3 becomes thicker than 0NLEVU, the value of W register is still "2" and C
The PU 100 determines in step 532 that the value of the W register is "10".
”, so steps S23.58 to S
The l+glue tape-on processing is not performed, and the pitch extraction control processing of steps S24 to S29 and S34 is performed as it is.

In this way, even if a picking operation is performed and the waveform is not stable when the waveform rises, and the waveform's trailing edge suddenly becomes thicker, the re-sounding process will not be performed and the picking operation will be performed only once. This prevents the sound generation process from being performed multiple times in a row even though there is a problem.

Then, as described above, when the string vibration is attenuated and the peak value falls below 0FFLEV as shown in FIG. The CPU 100 then instructs the sound source circuit 9 to perform a note-off process (mute process) and mute the musical tones that have been generated up to this point.

Note that the period during which re-sounding is not performed is not based on the number of cycles of the input waveform signal, but when the time counter is
In this case, the process in step S34 in FIG. 4 above is omitted, the time counter is reset in step S33, and then automatically reset. , and in step S32, the time count value reaches a certain period of time Ts.
Judgment processing will be performed to determine whether or not the limit has been exceeded.

Furthermore, if it is determined No in step S32 of the above embodiment, the values of J, b', and C may be made the same, and then the process proceeds to step s23, so that the relative-on processing may not be performed as a result.

Furthermore, in the above embodiment, in step S23, it is judged whether or not the waveform has suddenly changed based on the difference between the previous peak value b' and the current peak value C.
', /c>S (S is a predetermined value of 1 or more), such as the ratio of peak values, may be used to judge whether or not the waveform has changed rapidly.

Furthermore, although the determination is made as to whether or not the waveform has suddenly changed by comparing the previous wave height value and the current wave height value, it may be determined by comparing the wave height values two times before and this time.

A sudden increase in the peak value during the generation of musical tones may be detected by detecting other conditions.

In the above embodiment, the CPU 100 performs interrupt processing at the zero cross point immediately after each peak point to perform processes such as starting sound generation, calculating period, turning on relative sound, and starting muting. However, when each peak point is detected, These processes may be performed directly, and in that case, exactly the same results can be obtained.

In addition, for example, the same process as described above may be performed by detecting a zero-crossing point directly opposite the peak point.In addition, the method of determining the reference point can be changed in various ways.

Further, in the above embodiment, each process is executed during the main throw, but similar processes may be executed during 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 thereto, and pitch extraction may be performed from an audio signal or an electrical vibration signal input from a microphone, etc. Any type of system may be used as long as it generates an acoustic signal different from the original audio signal at a corresponding pitch or scale frequency. Specifically, a system with a keyboard such as an electronic piano may be used. The present invention can be similarly applied to electronic wind instruments and stringed instruments such as violins and kotos.

[Effects of the Invention J] As described in detail above, the present invention provides that even after the input waveform signal exceeds a predetermined value and a sound generation start command is given to generate a musical tone, when the input waveform signal suddenly increases in size, , the sound generation start command is given again, and the sound generation start command is not given again within a predetermined period after the sound generation start command is given, even if the input waveform signal suddenly increases. Even if the waveform is not stabilized when the waveform rises after an operation is performed, and the waveform level suddenly increases midway through, re-sounding processing will not be performed, and even though the picking operation is only one time, This prevents pronunciation processing from being performed multiple times in a row, and as a result,
This provides effects such as clearly distinguishing between re-pronunciation according to the tremolo playing technique and normal pronunciation, making it possible to more accurately start producing musical tones.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall circuit configuration of an input control device for an electronic musical instrument that is an embodiment of the present invention, and FIG.
A time chart diagram showing waveforms etc. appearing in each part of the diagram,
3 is a flowchart of the CPU's interrupt routine, FIG. 4 is a flowchart of the CPU's main routine, FIGS. 5 and 6 are time charts showing the operation of each part at the start of sound generation, and FIG. FIG. 7 is a time chart showing an example where the input waveform is unstable at the start of sound generation, and FIG. 8 is a time chart showing the operation when muting. l...Input terminal, 4...Maximum peak detection circuit, 5...Minimum peak detection circuit, 6...
... Zero cross point detection circuit, 7 ... Counter, 9 ... Sound source circuit, 12 ... Latch,
14.15...Flip-flop, 100...
...CPU, 101...Work memory, P
l-P6...Pitch extraction circuit. Patent applicant: Casio Computer Co., Ltd.::'1'-"('i f2 Figure 3 [Vltt arrow 1]) or 1 place (cr pW '4ntl pERlo
D. 6. □, 4. ．． ,7 G Go I!
Fig. 6 Koma also r packed χ0n χ1/I1. 8th V in z

Claims (3)

[Claims] (1) In an electronic musical instrument that extracts the pitch of an input waveform signal and generates a musical tone with a frequency based on that pitch, an instruction to issue a command to start producing a musical tone when the peak value of the input waveform signal exceeds a predetermined value. means, a detection means for detecting a change in the peak value of the input waveform signal; and when the detection means detects that the peak value has suddenly increased during the generation of the musical tone, it issues a sound generation start command again. a measuring means for measuring a predetermined period of time from the sound generation start command of the indicating means; and a measuring means for not outputting the re-sound start command of the control means within the predetermined period measured by the measuring means. An input control device for an electronic musical instrument, characterized in that the input control device comprises: a means for inhibiting the operation; and an input control device for an electronic musical instrument. (2) The input control device for an electronic musical instrument according to claim 1, wherein the measuring means measures the predetermined period by measuring a predetermined number of cycles of the input waveform signal. (3) The input control device for an electronic musical instrument according to claim 1, wherein the measuring means measures the predetermined period by counting a predetermined period of time.