JPH0749689A - Electroic musical instrument - Google Patents

Abstract

PURPOSE:To provide an electronic musical instrument in which highly continuous and appropriate touch data are obtained and key assignments are made employing a smallest possible conversion table. CONSTITUTION:The instrument consists of a calculating means 11 which detects the touch conditions of a keyboard, coefficient setting means 11 and 16 which set initial values and coefficients of the computations of the means 11 to optimized values by separating tone colors, pitches, touch curves, white and black keys, a touch detection means 11 which detects the touch data that match with the separation conditions of tone colors, pitches, touch curves, white and black keys and a key assignment means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument having touch detection means for detecting a key touch state in a keyboard device of a synthesizer, an electronic piano, an electronic organ, a single keyboard or the like.

In recent years, electronic musical instruments having various functions have become widespread and widely used. In particular, electronic musical instruments that have many sound sources built into one housing are compatible with MIDI (Musical Instrument Digital I
Nterface) A variety of inputs and outputs are possible through terminals, and a wide variety of usages have been developed and are widely used.

[0003]

2. Description of the Related Art Generally, in a keyboard device used in such an electronic musical instrument, presence or absence of key depression is not sufficient for expressing music, and differences due to key velocity, acceleration, pressure, etc. That is, it is necessary to consider the key touch.

For such a purpose, a touch detection device for generating different touch data depending on the state of key depression is provided. The touch data generated by this touch detection device is converted into velocity data or the like and given to a sound source in order to generate a musical tone of a volume or timbre corresponding to a key touch.

By adopting such a touch detection device, it becomes possible to express subtle changes in volume and timbre according to the strength of key depression, and it is possible to perform performances with rich expressiveness.

Generally, in such a touch detection device, each key is provided with a first switch that operates at an early position after the start of key pressing and a second switch that operates at a position where the key pressing operation has advanced, and each of these switches Many of them generate touch data based on the opening / closing signal.

As a first method that has been conventionally adopted, the counting of the counter is started by the signal of the first switch, the counter is counted up at regular intervals thereafter, and the counting is stopped by the signal of the second switch. It is known that touch data is obtained from the count value of the counter at this time.

As a second method, the maximum value of touch data is set in a predetermined register by the signal of the first switch, and thereafter, a predetermined coefficient (<1) is set at a constant time interval with respect to the contents of this register. It is known that the update is performed while multiplying by, the update is stopped when the signal from the second switch is generated, and the touch data is obtained according to the contents of the register at that time.

The above second method will be described in more detail. When the signal that the first switch is turned on is generated, the maximum value T ₀ of the touch data, for example, “7FFFh” (the last digit h indicates hexadecimal number, the same applies hereinafter) is set in a predetermined register. I do.

After that, the content of the register is multiplied by a predetermined coefficient A, for example, "127/128" at regular time intervals, and the touch calculation as shown in the following equation is performed.

T _n = A × T _n-1 (1)

Here, T _n is a value of touch data after updating, T _n-1 is a value of touch data before updating, and A is a coefficient.

Substituting the count A = 127/128 into equation (1),

T _n = (127/128) × T _n-1 = {1- (1/128)} × T _n-1 = T _n-1 -T _n-1 / 128 (2)

The multiplication in the equation (1) is performed by shift operation and subtraction in order to improve the operation speed. That is, "T _n-1 / 128" in the second term of the equation (2)
Is calculated by shifting T _n-1 by 7 bits in the LSB direction,
This shift result is subtracted from T _n-1 .

The initial value T _{0 of} T _n and the coefficient A are fixed values, and the actual calculation is given by the following equation.

T _n = T _n-1 -T _n-1 >> 7 ... (3)

In this way, the touch operation is performed at regular time intervals to update the contents of the register in sequence, and when the signal in which the second switch is turned on is detected, the contents of the register at that time (T _n ) The upper 7 bits of are extracted and used as touch data (maximum value 7Fh = 127).

However, the first method or the second method
The touch data obtained by the above method cannot be used as it is for the following reasons.

The first reason is that since the white key and the black key of the keyboard device have different lengths, even if the keys are pressed at the same speed, the second switch is turned on after the first switch is turned on. There is a difference in the time until it becomes. Therefore, it is necessary to perform correction so that the same touch data can be obtained for the white key and the black key when the keys are pressed at the same speed.

The second reason is that some electronic musical instruments can specify key touch characteristics.
In such an electronic musical instrument, it is necessary to correct the touch data according to the touch curve showing each key touch characteristic.

For example, in an electronic musical instrument in which three types of key touch characteristics, light, normal, and heavy can be selected, it is necessary to correct the touch data in order to realize the selected touch characteristics.

In the conventional touch detection device, the above correction is
For example, the process shown in FIG. 8 is performed.

That is, the touch calculation result (step S
For 1), the correction is performed depending on whether the pressed key is the white key or the black key (steps S2 and S3), and then the correction is performed according to the type of the touch curve designated from the operation panel or the like. (Steps S4, S5, S6), the final touch data is obtained (Step S7).

When it is desired to change the touch data depending on the tone color or tone pitch, more correction conversions are required.

When such a correction is to be performed by the conversion table, two conversion tables are provided for correcting the white key or the black key, and three for the selected touch curve. Will be needed. If each table has a capacity of 128 bytes, a capacity of 128 × 5 = 640 bytes is required.

In addition, if the above conversion table is used for correction, the data will be rough each time conversion is performed. For example, in the case of a conversion table that realizes the characteristics shown in FIG. 9, in a region where the input value is small, the output value changes little even if the input value changes a little.

However, in the area where the input value is large, the output value cannot be finely changed even though the change of the input value is small, and the output value is greatly changed. Therefore, in a region where the input value is large, the texture of the data becomes rough, and there is a drawback that smooth touch data cannot be obtained by using the conversion table in duplicate.
FIG. 10 shows an example of the conversion table.

In the conversion table of FIG. 10, the input 0
From 7Fh is converted from 1 to 7Fh, but input 73
All of h to 7Fh are converted to 7Fh. In addition, values such as 72h and 73h are not output.

It is clear that the accuracy of the conversion table should be improved in order to eliminate such a drawback, but for example, in order to improve the accuracy twice, double the data is required. . In the above example, 1280 bytes of data are required, 4 times requires 2560 bytes, and 8 times requires 5120 bytes.

Further, in an actual electronic musical instrument, as many as 32 conversion tables may be used as correction data for parameter control.

In this case, there are a total of 37 conversion tables, and the number of data bytes is 128 × 37 = 4.62.
Although it is 5 Kbytes, a huge amount of data, such as 9.25 Kbytes, 18.5 Kbytes, and 37 Kbytes, is obtained each time the calculation precision is increased and the continuity of data changes is increased. Economical and impractical.

A key assigner mounted on an electronic musical instrument sets a rank to a sounding channel at the start of sounding by distinguishing a pitch of a key or a decaying sound and a continuous sound, and decrements the rank at regular intervals. is there.

When there is a key input or a key-on input from MIDI, the key assigner assigns a sound to a vacant channel, but when all channels are sounding (full channel), the rank of each channel is compared. Assign to the lowest ranked channel.

Since the strength of touch is not taken into consideration in the process, when a large number of weak sounds are input after a strong sound to become a full channel, the level of the strong sound before is higher than that of the weak sound after. In addition, it was erased because of its low rank,
It becomes unnatural in terms of hearing.

[0036]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a tone color, a tone pitch, a touch curve,
According to the distinction between white key and black key, etc., determine the initial value to be set when the signal of the first switch is generated and the coefficient to be multiplied at regular intervals until the signal of the second switch is generated. Accordingly, it is an object of the present invention to provide an electronic musical instrument that can obtain appropriate touch data with high continuity from a conversion table that is as small as possible.

It is another object of the present invention to provide an electronic musical instrument equipped with a key assigner that allows the user to feel the touch naturally by changing the parameter and continuing the same performance after the touch is detected.

[0038]

SUMMARY OF THE INVENTION According to the present invention, a calculation means for detecting a touch state of a keyboard, and an initial value and a coefficient of the calculation by the calculation means are set to a tone color, a pitch, a touch curve, a white key,
Touch detection having coefficient setting means for setting an appropriate value by distinguishing black keys, etc., and detecting touch data that matches conditions such as tone color, pitch, touch curve, white key, and black key distinction It is configured by including means.

Further, a unit which can be used as a key assigner is provided by performing the same number of touch detection calculations as the number of sounds that can be sounded simultaneously, and changing the calculation coefficient after the touch detection is completed and continuing the calculations. .

[0040]

The electronic musical instrument according to the present invention has arithmetic means for appropriately detecting the touched state of each key, and when operating the arithmetic means, activates the coefficient setting means for setting the optimum coefficient at that time. . Therefore, by incorporating conditions such as tone color, tone pitch, touch curve, distinction between white key and black key as this coefficient, touch data that is natural and has no discomfort can be obtained.

By such an operation, the data which meets many conditions is taken into consideration, and the correction of the data using the large-scale conversion table is not required. Therefore, the memory capacity,
It is possible to obtain an electronic musical instrument that can perform a natural performance without increasing the number of arithmetic processing circuits and the like.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram schematically showing the overall structure of an electronic musical instrument having a touch detection device suitable as an embodiment using the touch data as described above.

The electronic musical instrument shown here is a system bus 10.
Via a central processing unit (hereinafter referred to as CPU) 11,
A read only memory (hereinafter referred to as ROM) 12, a random access memory (hereinafter referred to as RAM) 13, a keyboard scan circuit 14, and a sound source 15 are interconnected.

The system bus 10 is composed of, for example, an address bus, a data bus, a control signal bus, etc., and exchanges signals between the connected elements.

The CPU 11 includes a part of the coefficient setting means, the calculating means and the touch detecting means, and the like.
It controls the entire electronic musical instrument according to the control program stored in M12.

For example, the CPU 11 takes in a key on or off signal from the keyboard scan circuit 14, calculates the key number and touch data of the key having the event based on the data in this case, and based on these, the ROM.
The tone generation parameter is read from 12 and sent to the tone generator 15 to perform a process of generating a musical tone that matches conditions such as a predetermined tone color and pitch.

The CPU 11 has a built-in timer (not shown), and generates an interrupt to the CPU 11 at regular time intervals. This timer interrupt is used as the timing for calculating the touch data. Further, the weight value W until the start of the arithmetic processing is determined as necessary.

An operation panel 16 and a MIDI 17 are connected to the CPU 11. The operation panel 16 corresponds to a part of the coefficient setting means and an input means. The MIDI 17 transmits / receives digital music data to / from other musical instruments or computers.

The ROM 12 stores a control program for the CPU 11 and various fixed data required by the CPU 11. In addition, the ROM 12 stores sounding parameters for generating a musical sound of a predetermined tone color.

This tone generation parameter is provided for each tone color and tone range, and includes, for example, waveform address, frequency data, envelope data, filter coefficient and the like.

The RAM 13 temporarily stores various data handled by the CPU 11, and includes definitions of various registers, counters, flags and the like for controlling the electronic musical instrument.

The keyboard scanning circuit 14 is connected to a keyboard 18 having the number of white keys and black keys required for the musical instrument. The keyboard 18 also functions as a part of the keyboard device and the coefficient setting means. Each key is provided with, for example, two switches S1 and S2 (not shown), and basic data relating to key touch is detected in response to key depression and key release.

The first switch S1 operates at the position after the start of key depression, and the second switch S2 operates at the position where the key depression has advanced. The signals generated by these switches are sent to the CPU 11 via the keyboard scan circuit 14 and the system bus 10.
It is connected to the.

The keyboard scanning circuit 14 detects the operation of a depressed or released key, specifically, the on / off state of the first switch S1 and the second switch S2. Therefore, the keyboard scan circuit 14 sends a scan signal to the keyboard 18, receives operation key data, and transmits it to the CPU 11.

The CPU 11 determines the presence / absence of a key event and the type of the key event (on event, off event) from the data indicating the on / off states of the first switch S1 and the second switch S2 from the keyboard 18. Then, a calculation for obtaining touch data is started, and at the same time, a sounding process or a mute process is performed for the key having the event.

A waveform memory 19 is connected to the sound source 15. The waveform memory 19 can be composed of, for example, a ROM. Here, it is generated by converting the musical tone to be generated into an electric signal and subjecting the musical tone signal obtained through a predetermined filter to pulse code modulation.

The waveform memory 19 stores a plurality of types of waveform data corresponding to each keyboard and each tone color in order to realize a plurality of types of tone colors. The waveform data stored in the waveform memory 19 is read by the sound source 15.

The sound source 15 is, for example, a circuit including a plurality of oscillators. The tone generator 15 receives the tone generation parameter and tone generation start command from the CPU 11, reads the waveform data stored in the waveform memory 19, adds an envelope to the waveform data, and generates a digital tone signal.

A digital / analog converter (hereinafter referred to as D / A) 20, an amplifier 21, and a speaker device 22 as a reproducing device are connected to the sound source 15. The output of the sound source 15 is converted into an analog signal in the D / A 20 and then amplified to a desired level in the amplifier 21, and then a speaker device 22 generates an acoustic output.

When the CPU 11 issues the tone generation end command, the reading of the waveform data stored in the waveform memory 19 is stopped and the output of the digital tone signal to the D / A 20 is stopped.

Among the operations of the electronic musical instrument having the above-described structure, the touch detection operation will be mainly described.
FIG. 2 is a flowchart showing a main routine of the present electronic musical instrument, and initialization processing is performed by turning on the power (step S11).

This initialization processing sets the internal state of the CPU 11 according to the initial conditions, if the configuration of FIG. 1 is applied, and sets the registers, counters, flags, etc. defined in the RAM 13 to the initial state. It is a process to do.

The initialization process also includes a process of transmitting predetermined data to the sound source 15 to prevent the speaker device 22 from generating unnecessary sound when the power is turned on.

Upon completion of these initialization processes, panel event detection / process is performed (step S12).
In this process, panel data generated in response to an operation of a switch, a dial, or the like (not shown) on the operation panel 16 is fetched and a corresponding process is executed. It also includes a process of displaying operation contents on a display unit (not shown).

Then, a keyboard event is detected and processed (step S13). In this processing, touch data generated in response to a key depression operation of each key is detected and sound generation processing is performed, and mute processing is performed in response to key release operation.

After the above processing is completed, the MIDI event is detected and processed (step S14). Here M
Data is sent and received via the IDI, and then step S12 and subsequent steps are repeated.

The touch data processing in the electronic musical instrument according to the present invention will be described in detail below. In the present invention,
Expression (1) for performing touch data processing according to the related art
Instead of (3), the following equation with the coefficient B added is adopted.

T _n = A × T _n-1 + B (4)

Further, when the calculation process of the equation (4) is started, an appropriate touch data can be obtained by adding the weight value W from the turning on of the first switch S1 to the start of the calculation.

In such arithmetic processing, touch data that can be used without correction can be obtained by setting an arbitrary value according to the distinction of tone color, pitch, touch curve, and white key / black key instead of a fixed value. .

According to such means, even when the same correction as in the case of the above-mentioned conventional technique is performed, 2 × 3 ×
There are 32 = 192 ways, and even if each of T ₀ , A, B, and W is 2 bytes, 192 × 8 = 1536 bytes is sufficient, and the data amount is about one-third.

An example of the initial value T ₀ of the touch data, which is the coefficient given to the equation (4), the coefficient A, the coefficient B, and the weight value W (hereinafter, these are collectively referred to as calculation parameters) is shown in FIG. FIG. 3B shows a touch curve obtained by the touch calculation when each calculation parameter is given in a). The description regarding FIG. 3B is as follows.

Curve 1 ... Initial value T ₀ = Maximum value (= 7F
FFh), coefficient A = 127/128, coefficient B = 0, and weight value W = 0.

This is the same as the key touch characteristic obtained by the equation (1) described in the conventional example.

Curve 2 ... Initial value T ₀ = 1 / the maximum value
2, the curve is for a coefficient A <1, a coefficient B = 0, and a weight value W = 0.

This is an example in which the initial value T ₀ of the curve 1 is halved. This key touch characteristic is used, for example, when a soft pedal attached to an electronic musical instrument is depressed, and the touch data is generally small, the velocity is small, and thus a musical sound with a low volume is obtained.

Curve 3 ... Initial value T ₀ = maximum value, coefficient A
> 1, coefficient B = negative value, weight value W = 0.

According to this characteristic line, large touch data can be obtained despite a relatively weak keystroke, and a light touch curve can be realized.

Curve 4 ... Initial value T ₀ = maximum value, coefficient A
The curve is for <1, coefficient B = 0, and weight value W = positive value.

The calculation is started after the elapse of the predetermined time t. According to this characteristic line, maximum touch data can be obtained up to a predetermined keystroke strength.

Curve 5 ... Initial value T ₀ = maximum value, coefficient A
= 0, coefficient B = negative value, weight value W = 0.

According to this characteristic line, touch data that linearly decreases according to the keystroke strength can be obtained.

Curve 6 ... Initial value T ₀ = maximum value, coefficient A
It is a curve when <1, coefficient B = positive value, and weight value W = 0.

According to this characteristic line, touch data with small attenuation can be obtained even when the keystroke strength is weak.

The above-mentioned calculation parameters and the touch curves of the touch calculation results are merely examples, and various touch curves, that is, key touch characteristics can be obtained depending on how the calculation parameters are given.

FIG. 4 is an explanatory view detailing the touch characteristics according to the present invention, showing the relationship between the operating states of the first switch S1 and the second switch S2 in the table shown in the upper part of the drawing.

As shown in section 1 in the table at the top of the figure, when the first switch S1 is first turned on (the second switch S2 is turned off during this time) by pressing a key, the channel with the lowest calculation result (lowest rank) is obtained. Is detected and high-speed muffling processing is performed on that channel, and then initial values and parameters for touch detection are set.

Then, a calculation is performed at every interruption of a constant time interval until the switch S2 is turned on, and the switch S2 is turned on.
The calculation result at the start point of the section 2 of the table where is turned on is used as touch data. At that time, good touch data can be obtained by setting parameters considering tone color and pitch.

After that, when both the first switch S1 and the second switch S2 are turned on as in the section 2 of the table, the calculation result is left as it is and the other parameters are changed to the parameters for the key assigner. This parameter usually has a value that causes a slower decay than that for touch detection. Also,
The parameters for the key assigner also take into consideration the timbre and pitch.

For example, when the timbre is a continuous tone, it takes a value that is hardly attenuated. When the timbre is an attenuated sound, the value is set such that the higher the tone, the faster the attenuation, and the lower the tone, the later the attenuation.

Then, as in the last part of section 2, the first
Until the switch S1 is turned off, the key assigner parameter is calculated at every interruption at a constant time interval, assuming that the key is on.

When the second switch S2 is turned off as in the section 3 in the table, the state does not change at all.

If the first switch S1 is turned off together with the second switch S2 as in section 4 in the table, the muffling process is performed and the calculation parameter is changed for release.

In the assigner according to the prior art, a value matching the tone color and pitch is set to the channel at the time of sounding,
The smallest value (lowest rank) by subtracting at regular time intervals
I was assigned to. Therefore, the volume at the time of pronunciation was not considered.

FIG. 5 is a flow chart showing the state of keyboard event interruption. With the start of the keyboard event interrupt, it is determined whether the first switch S1 associated with each key is on or off (step S21). This switch S1
Is determined to be on, then the second switch S
A determination is made as to ON / OFF of 2 (step S22).

When the switch S2 is also on, the current T
The value of _n is determined as the touch value (step S23). Then, the functions of the sound source and other components of the electronic musical instrument are exerted to perform a predetermined sounding process (step S24).

Thereafter, the key assignment data A, B and W are set without changing the value of T (step S25). Further, MIDI key-on output is performed (step S26),
Will be returned.

When the first switch S1 is not turned on (step S21), it is determined whether or not there is the same key number (step S27). If there is no same key number, it is returned.

If it is determined that the same key number is present, the mute processing is performed (step S28). Next, release data, A, B, and W are written (step S2
9) Further, MIDI key-off is output (step S30), and the process returns.

Although the first switch S1 is on, the second switch
When it is determined that the switch S2 of 1 is off (step S22), it is determined whether or not there is the same key number (step S31). If they have the same key number,
Will be returned.

If it is determined that the same key number does not exist, the lowest rank channel is detected (step S3).
2). Along with this, high-speed mute processing of the lowest rank channel is performed (step S33).

After the sound is muted at high speed in this way, a new key number is set for the lowest rank channel (step S34). After that, touch detection data, T ₀ , A,
After setting B and W (step S35), the process returns.

FIG. 6 is a flow chart showing the operation of the MIDI event interrupt. First, it is determined whether or not the event interrupt flag is on (step S
41). If it is determined that the channel is on, the lowest rank channel is detected (step S4).
2).

Next, a tone generation process is performed (step S4
3), and the key number is set again (step S4).
4).

After that, the key assignment data, T ₀ , A,
B and W are set (step S45), and the process returns.

On the other hand, when it is determined that the event flag is not on (step S41), it is determined whether or not the same key number is present (step S46). If not, it will be a return.

If it is determined that the same key number is present, the mute processing is performed (step S47).

After that, key release data, A, B, W
Is set (step S48), and the process returns.

FIG. 7 is a flow chart showing the operation of the timer interrupt. First, the channel No. Is set to the number capable of simultaneous sound generation (step S51).

Then, it is determined whether or not W = 0, that is, whether or not to perform weighting (step S52). If W = 0, that is, if no weight is provided, the calculation of T _n = A × T _n-1 + B is performed (step S
53).

Thereafter, whether T _n is negative, that is, T _n
It is determined whether or not _n <0 (step S54). Here, when T _n is negative, T _n = 0 is set (step S55).

After that, the channel No. Is decremented by 1 (step S57), and as a result, it is determined whether or not the channel is 0 (step S58). If it is 0, it is a return. If it is not 0,
After step S52, the process for the next channel is repeated.

When it is determined in step S52 that W = 0 is not satisfied, that is, weight is to be added, the process of W = W-1 is performed (step S56), and then the process of reducing the channel by one (step S57). ) Do the following.

If it is determined in step S54 that T _n <0 is not satisfied, step S55 is skipped,
Channel No. To reduce one (step S57)
Perform the following processing.

[0115]

As described above in detail, according to the present invention, the initial value T0 to be set when the first switch S1 is opened / closed according to the distinction of tone color, pitch, touch curve, and white key / black key.
And coefficients A and B that are calculated at constant intervals until the second switch S2 is opened and closed, and a weight value W that delays the start of calculation.
By defining, it becomes possible to detect the touch data by a simpler method.

Further, by performing the calculation of touch data detection by changing the parameters even after the touch detection, it is possible to realize the key assigner in which the touch data is always taken into consideration.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing a main routine in the electronic musical instrument according to the present invention.

FIG. 3 is an explanatory diagram of a calculation parameter and a touch curve of a calculation result.

FIG. 4 is an explanatory diagram showing a relationship between an operation of a touch detection switch and a touch curve.

FIG. 5 is a flowchart showing a keyboard event interrupt operation in the electronic musical instrument according to the present invention.

FIG. 6 is a flowchart showing MIDI event interrupt operation in the electronic musical instrument according to the present invention.

FIG. 7 is a flowchart showing a timer interrupt operation in the electronic musical instrument according to the present invention.

FIG. 8 is an explanatory diagram of a white key and a black key of an electronic musical instrument and correction by a touch curve.

FIG. 9 is an example of a conversion table in an electronic musical instrument.

FIG. 10 is a graph showing a relationship between an input value and an output value of a conversion table in an electronic musical instrument.

[Explanation of symbols]

 10 System Bus 11 Central Processing Unit (CPU) 12 Read Only Memory (ROM) 13 Random Access Memory (RAM) 14 Keyboard Scan Circuit 15 Sound Source 16 Operation Panel 17 MIDI 18 Keyboard 19 Waveform Memory 20 D / A Converter 21 Amplifier 22 Speaker apparatus

Claims (2)

[Claims] 1. An arithmetic means for detecting a touch state of a keyboard, and an initial value and coefficient for arithmetic operation by the arithmetic means are set to proper values by distinguishing tone color, pitch, touch curve, white key, black key, etc. And a coefficient setting means for
An electronic musical instrument comprising a touch detection unit that detects touch data that matches conditions such as pitch, touch curve, distinction between white key and black key. 2. A means that can be used as a key assigner by performing the same number of touch detection calculations as the number of sounds that can be sounded at the same time, changing the coefficient of the calculation after the touch detection is completed, and continuing the calculation. An electronic musical instrument characterized by that.