JP2712361B2 - Key operation detection device for electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to pitch, timbre,
The present invention relates to an electronic musical instrument whose tone characteristics such as volume are controlled, and more particularly to an improvement of a key operation detecting unit.

[Summary of the Invention] The present invention is intended to easily perform a rapid continuous playing by detecting the intensity of key touch and the key-on at a depth deeper than a key-off detection point with a key depression.

[Prior Art] Conventionally, as an electronic musical instrument whose tone characteristics are controlled in accordance with the strength of key touch, first and second key switches that are sequentially turned on in response to key depression for each key are provided, Measuring the time from when the first key switch is turned on to when the second key switch is turned on, generates touch data corresponding to the key-depression speed, and generates a key-on signal when the second key switch is turned on; It is known that the tone characteristics of a tone signal generated in response to the key-on signal are controlled in accordance with touch data (for example, Japanese Patent Publication No. 58-57119).
Reference). In this case, the generated tone signal is attenuated in accordance with a key-off signal generated when the first key switch is turned off with the return of the key.

[Problems to be Solved by the Invention] According to the above-described related art, since the first key switch is also used for detecting the strength of key touch and for detecting key-off, a tone signal is generated in response to a key press. After that, unless the first key switch is once turned off, even if the same key is pressed again, a tone signal corresponding to the key pressing again cannot be generated. In other words, when the same key is repeatedly struck, a tone signal can be generated each time the key is pressed by performing the key operation with a sufficient stroke so that the first key switch is turned off, but the key stroke is large. For example, it is difficult to perform a rapid continuous performance such as a continuous performance on a grand piano, and there are inconveniences such as performance expression and restrictions.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to easily perform a rapid continuous performance.

[Means for Solving the Problems] A key operation detecting device for an electronic musical instrument according to the present invention comprises:
And second detection means.

The first detecting means generates a key-off signal by detecting that the key is pressed deeper than the first pressing depth and then returns to a depth smaller than the first pressing depth.

The second detecting means generates touch data in accordance with the strength of the key touch each time the key is pressed beyond a second pressing depth which is deeper than the first pressing depth, and in response to the pressing of the key. A key-on signal is generated. here,
The strength of key touch can be detected in the form of pressing force or key pressing speed.

The second detecting means is provided when the key is pressed beyond the second pressing depth after passing through the first pressing depth (at the time of single hit).
And when the key is pressed again beyond the second pressing depth without returning to the first pressing depth after passing through the first pressing depth (at the time of continuous striking), Alternatively, it may be configured to generate touch data having different values.

[Operation] According to the configuration of the present invention, when a key is pressed beyond the second pressing depth after passing through the first pressing depth, the touch data and the touch data corresponding to the strength of the key touch at that time are obtained. Since a key-on signal is generated in response to a key depression, a tone signal can be generated based on the touch data and the key-on signal. Thereafter, when the key returns to a position shallower than the first pressing depth, for example, due to the key release, a key-off signal is generated, so that the tone signal being generated can be attenuated in accordance with the key-off signal.

Also, after the touch data and the key-on signal are generated in accordance with the key press and the key is pressed again without returning to the first pressing depth, the touch data and the key-on signal are generated, and the musical tone is correspondingly generated. A signal can be generated. Therefore, it is possible to perform rapid continuous performance with small keystrokes.

As described above, when the second detection means generates touch data having different values for a key touch having the same strength between a single hit and a continuous hit, the pitch at the time of the continuous hit,
The tone characteristics such as tone and volume can be controlled so as to be different from the tone characteristics at the time of single tapping, which is convenient for simulating continuous playing of a grand piano, for example.

Embodiment FIG. 1 shows a circuit configuration of an electronic musical instrument according to an embodiment of the present invention. In this electronic musical instrument, the tone generation based on keyboard operation is controlled by a microcomputer.

1. Circuit Configuration (FIG. 1) In FIG. 1, the data bus 10 includes a keyboard circuit 12, a panel switch circuit 14, a central processing unit (CPU) 16, a program memory 18, a register group 20, a conversion table memory 22,
A tone generator (TG) 24 and the like are connected.

The keyboard circuit 12 includes a manual performance keyboard,
Key operation information is detected for each key on the keyboard. The keyboard has 61 keys as an example, and the key code value for each key name is determined in advance as shown in FIG. The detection of the key operation information will be described later with reference to FIGS. 3 and 4.

The panel switch circuit 14 includes a panel switch for setting a tone color, a volume, and the like, and detects setting information according to a switch operation.

The CPU 16 executes various processes for generating musical tones in accordance with the programs stored in the program memory 18. These processes will be described later with reference to FIGS. 5 to 11. A clock signal CLK for time measurement is supplied from the clock generator 26 to the CPU 16, and the clock interrupt routine shown in FIG. 6 is executed for each pulse of the clock signal CLK.

The register group 20 includes a large number of registers used for various processes by the CPU 16, and registers related to the embodiment of the present invention will be described later.

The conversion table memory 22 is used to convert the value of a time register TIMER, which is inversely proportional to the key pressing speed, into speed data substantially proportional to the key pressing speed. To the corresponding speed data value C
I remember NV.

The TG 24 has, for example, 16 musical tone forming channels, and can simultaneously generate up to 16 sounds. When a desired key is pressed on the keyboard, a key code corresponding to that key is assigned to one of the tone forming channels, a tone signal corresponding to the key code starts to be generated in response to the key-on signal in the assigned channel, and a key-off signal is generated. , The tone signal starts to decay.

The sound system 28 includes an output amplifier, a speaker, and the like, and emits a tone signal from the TG 24 as a tone.

Key Operation Detection (FIGS. 3 and 4) FIG. 3 shows a cross-sectional configuration of a key switch portion for one key.

At the bottom of the key member KY, three downward projections A, B, C
Are provided, and when the respective protruding lengths are L _A , L _B , and L _C , a relation of L _A > L _B > L _C is established.

An elastic member EM made of rubber or the like is provided below the key member KY, and the elastic members correspond to the downwardly protruding members A, B, and C of the key member KY, respectively, and the inside has a hollow cushion portion a, b and c.

First, second and third key switches KSW ₁ , KSW ₂ , between the cushion portions a, b, c of the elastic member EM and the support surface SS.
KSW ₃ is formed respectively.

When the key member KY is pressed in the direction of arrow P, the key switch
KSW ₁ , KSW ₂ , and KSW ₃ are turned on in the order described. When the pressing force is released, the key member KYY returns to the position shown in the figure. In the process of this return, KSW ₃ and KS
Key switch is turned off in the order of W _2, KSW _1.

Figure 4 is intended with respect to pressing depth d ₁ to d ₃ of the key shows the output signal of the key switch KSW ₁ ~KSW _3, "0" is turned off, "1" corresponding to the ON state. Also, d _{1 to} d ₃
Are in a relationship of d ₁ <d ₂ <d ₃ .

First the pressing reaches a depth d ₁ go by pressing the key,
When KSW ₁ is turned on, it reaches the second depression depth d _2, KSW ₂
There turned on and reaches the third pressing depth d _3, KSW ₃ is turned on. When the keys are released, the key switches are turned off in the reverse order.

In this embodiment, based on the clock signal CLK, a time (key pressing speed corresponding time) from when the KSW ₂ is turned on to when the KSW ₃ is turned on is detected to form touch data, and the KSW ₃ on event is keyed on. Detect as timing, KSW ₁
Is detected as a key-off timing.
In this way, even if re-pressing a key without returning to d ₁ are possible time detection and key-on detection.

Registers Among the registers belonging to the register group 20, those related to the embodiment of the present invention are listed as follows.

(1) First and second channel number registers ASS, ASS
2... These registers are for setting any one of channel numbers 0 to 15.

(2) Clock counter COUNT: This is a clock signal C
This is an 8-bit counter that counts up by one every time an interrupt is issued by LK.
It is reset to 0 when it reaches 100.

(3) End count value register ED ₀ ~ED ₆₀ ... These registers those provided corresponding to 61 keys of the keyboard, each register of the corresponding key switch KSW ₃
Is turned on (when the measurement of the time corresponding to the key pressing speed is completed), the value of the counter COUNT is set.

(4) Time measurement flags ENB _{0 to} ENB ₆₀ .
Each key is a 1-bit register provided corresponding to each key. Each flag has a corresponding key switch KSW ₂
Is set to “1” when is turned on, and the corresponding key switch
“0” is set when KSW ₃ is turned on. That is, each flag indicates that the key pressing speed corresponding time is being measured for the corresponding key because the content is “1”.

(5) Control variable register i... This is where the control variable i is set.

(6) Key code buffer registers KCBUF _{0 to} KCBUF ₁₅ ...
These registers are provided corresponding to the 16 channels for forming a musical tone, respectively, and channel assignment is performed by storing a key code for each register.

(7) Key code register KEY: This is used for key scanning. Each time any one of the key codes 0 to 60 is set, the switches KSW _{1 to} KSW ₃ are turned on or off for the key corresponding to the key code. An off event is detected.

(8) Key on / off flags KON _{0 to} KON ₁₅ …
This is a 1-bit register provided for each of the 16 channels for tone generation. Each flag "1" indicates that the key is on, and "0" indicates that the key is not on.

(9) Event order counters LVLCNT _{0 to} LVLCNT ₁₅ ... These counters are provided corresponding to the 16 channels for musical tone formation, respectively. When selected, FF _H (the subscript “H” represents hexadecimal notation; the same applies hereinafter) is set, and when key-off is detected for a key that is sounding on the channel, 7F _H is set. In any case, 1 is subtracted from the set value every time any key has an event (key on or key off). However, such a subtraction is performed until the counter value becomes 80 _H when the counter value is set to FF _H and until the counter value becomes 00 _H when it is set to 7F _H. Elapsed time from the key-on event occurs by referring to the Counter LVLCNT ₀ ~LVLCNT ₁₅ becomes searchable longest channel (channel according to the oldest key depression).

(10) Search register LVLMIN: This is used to search for the channel related to the oldest key press. The counter LVLCNT _{0 to} LVLCNT ₁₅ are checked in order, and the value of the counter that gives the minimum value is Finally set.

(11) the overflow counter MPL ₀ ~MPL ₆₀ ... These counters are those which are provided corresponding to 61 keys of the keyboard, each counter switch corresponding key KSW ₂
After the counter is reset when is turned on, the value increases by one each time the counter COUNT reaches the count value 100 and is reset.

(12) Key-off register OFF: This is used to set the number of the channel assigned to the key that is currently sounding when a key-off occurs.

(13) Old Channel register OLD ... This is intended to be used to search the channel according to the earliest depressed key, corresponding to the counter giving the oldest value went sequentially examine counter LVLCNT ₀ ~LVLCNT ₁₅ (The number of the channel related to the oldest key press) is finally set.

(14) Start count value registers ST _{0 to} ST ₆₀ ... These registers are provided corresponding to the 61 keys of the keyboard, respectively. Each register has a corresponding key switch KSW _2.
Is turned on (at the start of measuring the time corresponding to the key pressing speed), the value of the counter COUNT is set.

(15) Time register TIMER... This stores time data corresponding to the key pressing speed. The value of this time data is obtained by the calculation of the following equation (1).

MPL _KEY x 100 + (ED _KEY- ST _KEY ) ... (1) In the equation (1), MPL _KEY is the value of the overflow counter (MPL) corresponding to the key related to key-on detection, and ED _KEY is the corresponding key. The value of the end count value register (ED), ST _KEY, is the value of the start count value register (ST) corresponding to the key.

(16) Touch data register TOUCH... This stores the touch data for controlling the tone characteristics, and the value of the touch data is obtained by the calculation of the following equation (2).

WEIGHT × CNV (TMER) (2) In the equation (2), WEIGHT is a value of a coefficient register described below, and CNV (TIMER) is speed data read from the memory 22 corresponding to the value of the register TIMER. Is the value of

(17) the coefficient register WEIGHT ... It is intended that the coefficient data is set, the value of the coefficient data is set to 1.0 at the time of the on key switch KSW ₁ As an example, when the key switch KSW ₂ off is 0.8. Therefore, after turning on KSW ₁ , KSW
_2, and when the KSW ₃ was turned on, at the when the re turn on KSW _2, KSW ₃ without going through the on-post KSW ₁ off KSW _1, the value of CNV (TIMER) in the above (2) Are the same,
The value of the touch data obtained by the calculation of the expression (2) is smaller in the case of the re-ON.

Main Routine (FIG. 5) FIG. 5 shows the flow of the processing of the main routine, and this routine is started in response to power-on.

First, at step 30, an initialization routine is executed. For example, KON _{0 to} KON ₁₅ , KCBUF _{0 to} KCBUF ₁₅ , LVLC
The _{NT 0 ~LVLCNT 15, ENB 0 ~ENB} 60, both sets 0.

Next, in step 32, the key code value 0 corresponding to the lowest tone is set to KEY, and then an event detection process 34 of the key corresponding to the KEY value is executed.

In the event detection process 34, in step 36, there is on-event in Step KSW ₁ determines. If the result of this determination is affirmative (Y), the flow proceeds to step 38, and WEIGHT is set to 1.
Set 0.

The determination result in step 36 is when the process of or step 38 when was negative (N) is over, the process proceeds to step 40, it is determined whether there-on event in step KSW _2. If this determination result is affirmative (Y), the process proceeds to step 42, where KE
The time measurement flag ENB (KEY) corresponding to the Y value is set to 1, the COUNT value is set to the start count value register ST (KEY) corresponding to the KEY value, and KE
The overflow counter MPL (KEY) corresponding to the Y value is set to 0.

The determination result in step 40 is when the process of or step 42 when was negative (N) is over, the process proceeds to step 44, it is determined whether there on event to switch KSW _3. This judgment result is transferred to step 46 if affirmative (Y), a subroutine of KSW ₃ on as described below for Figure 7.

The decision result in the step 44 when the process of or step 46 when the A was negative (N) is over, the process proceeds to step 48, it is determined whether there off event in step KSW _1. If this determination result is affirmative (Y), the process proceeds to step 50,
The key-off subroutine is executed as described later with reference to FIG.

Step 48 of the determination result when the process of or step 50 when was negative (N) is over, the process proceeds to step 52, it is determined whether there off event to switch KSW _2. If the result of this determination is affirmative (Y), the routine proceeds to step 54, where WE
Set IGHT to 0.8.

When the determination result of step 52 is negative (N) or when the processing of step 54 is completed, the event detection processing
34 is over, and the routine goes to step 56.

In step 56, the value of KEY is increased by one. As a result, for example, the first time after step 32, step 56 is reached, the value of KEY becomes 1.

Next, in step 58, it is determined whether the value of KEY is smaller than 61. If the value of KEY is 1 as described above, the determination result of step 58 is affirmative (Y), and the routine goes to step 60.

In step 60, other processing (for example, setting processing based on operation of a tone switch, a volume switch, and the like) is performed. Then, returning to step 36, the above-described event detection processing 34 is executed for the key corresponding to the key code value 1.

Thereafter, each time the value of KEY is incremented by 1, the above processing is repeated. Then, when the value of KEY becomes 61 in step 56, the event detection processing for 61 keys has been completed. In this case, the determination result in step 58 is negative (N), and 0 is set in KEY in step 62. Then, the process returns to step 36 via step 60, and repeats the above processing.

As a result, for the 61 keys corresponding to the key code values 0 to 60, the event detection processing 34 is sequentially and repeatedly performed.

Clock Interrupt Routine (FIG. 6) FIG. 6 shows a clock interrupt routine, which is started for each pulse of the clock signal CLK.

In step 70, the value of COUNT is increased by one. Then, the process proceeds to a step 72.

In step 72, it is determined whether the value of COUNT is AO _H (100 in decimal), and if the result of this determination is negative (N), the routine returns to the routine of FIG. 6 to 11, "RET" indicates a return.

When the determination result of step 72 is affirmative (Y), the process proceeds to step 74, and COUNT is reset to 0. Then, after setting the control variable i to 0 in step 76,
Move to 78.

In step 78, the ith time measurement flag ENB _i is 1 and the value of the _ith overflow counter MPL _i is FF
_Judge whether it has reached _H (maximum value). If the result of this determination is affirmative (Y), the routine proceeds to step 80, where the value of MPL _i is set to 1
Increase (add 1 as overflow count).

When the result of the determination at the step 78 is negative (N) or when the processing at the step 80 is completed, the process proceeds to a step 82, at which the value of i is increased by one. Then, at step 84, i
It is determined whether it is greater than 60, and if it is not greater (N), the flow returns to step 74, and the processing after this step is repeated in the same manner as described above. As a result, the value in the condition that does not reach the FF _H only those corresponding to the key in the key depressing velocity corresponding time measurement of MPL ₀ ~MPL ₆₀ is 1 up.

When the value of i becomes 61 by the processing of step 82, the determination result of step 84 becomes affirmative (Y), and the routine returns to the routine of FIG.

KSW ₃ ON Subroutine (FIG. 7) FIG. 7 shows a KSW ₃ ON subroutine. In step 90, it is determined whether the time measurement flag ENB (KEY) corresponding to the KEY value is 0 or not. If this determination result is positive (Y),
Since the key pressing speed corresponding time is not being measured for the key corresponding to the KEY value, the process returns to the routine of FIG.

If the decision result in the step 90 is negative (N), the process shifts to a step 92 where ENB (KEY) is set to 0 and the end count value register ED (KEY) corresponding to the KEY value is set.
Set the value of COUNT. Then, the process proceeds to step 94.

In step 94, the operation of the above equation (1) is executed, and the value obtained as the operation result is set in TIMER. Then, the process proceeds to step 96.

In step 96, the operation of the above equation (2) is executed, and the value obtained as the operation result is set in TOUCH. Then, the process proceeds to step 98.

In step 98, a key-on subroutine is executed as described later with reference to FIG. 8, and thereafter, the process returns to the routine of FIG.

Key-On Subroutine (FIG. 8) FIG. 8 shows a key-on subroutine. In step 100, the control variable i is set to 0. Then, the process proceeds to step 102.

In step 102, or not the values of the i-th key code buffer register KCBUF _i of KEY equal (same key code and the KEY to the i channel or already assigned) is determined.
If the result of this determination is negative (N), the routine proceeds to step 104, where the value of i is increased by one. Then, the process proceeds to step 106.

In step 106, it is determined whether the value of i is smaller than 16, and if it is smaller (Y), the process returns to step 102. Then, the processing after step 102 is repeated in the same manner as described above until i = 16. When i = 16, the determination result of step 106 becomes negative (N). This means that the same key code as KEY has not been assigned to any of the 0th to 15th channels.

When the determination result of step 102 is affirmative (Y), the process proceeds to step 108, and the value of i (the number of the channel to which the same key code as KEY is assigned) is set to ASS. Then, the value of i is increased by 1 in step 110, and then the process proceeds to step 112.

In step 112, it is determined whether the value of i is smaller than 16. If the determination result is affirmative (Y), the process proceeds to step 114.

In step 114, as in step 102, KEY = KCBUF _i
Is determined. If the determination result is negative (N), the process returns to step 110, and the processes after this step are repeated in the same manner as described above until i = 16. Then, when i = 16, the determination result of step 112 becomes negative (N). This means that the same key code as KEY has been assigned to only one channel of the number set to ASS among the 0th to 15th channels.

When the result of the determination in step 106 or 112 is negative (N), the process proceeds to step 116, and an old search subroutine is executed as described later with reference to FIG. The processing in step 116 is for searching for the channel related to the oldest key press. In OLD, the number of the channel related to the oldest key press is set. Then, after step 116, the process proceeds to step 118, where the OLD channel number is ASS.
Set to.

On the other hand, if the decision result in the step 114 is affirmative (Y), the process shifts to a step 120 to set the value of i (the number of the channel to which the same key code as KEY is assigned) in ASS. This is the case when there are two channels to which the same key code as KEY is assigned.

Next, in step 122, whether the value of the event order counter LVLCNT (ASS2) corresponding to the value of ASS2 is smaller than the value of the event order counter LVLCNT (ASS) corresponding to the value of ASS (if the channel corresponding to ASS2 value It is determined whether the key press timing is older than the channel). If the result of this determination is affirmative (Y), the routine proceeds to step 124, where the channel number of ASS2 is set in ASS.

When the determination result of step 122 is negative (N), when the processing of step 124 is completed, or when the processing of step 118 is completed, the process proceeds to step 126. As a result, K
When the number of channels to which the same key code as EY is assigned is 0 or 1, the channel related to the oldest key press is the assigned channel. Is the assigned channel.

In step 126, it sets the FF _H to LVLCNT (ASS). Then, in step 128, the key code value of KEY is set in the key code buffer register KCBUF (ASS) corresponding to the ASS value. Thereafter, in step 130, 1 is set to a key on / off flag KON (ASS) corresponding to the ASS value.

Next, in step 132, key-on processing is performed based on KEY and TOUCH in a channel (assigned channel) corresponding to the ASS value of TG24. As a result, a tone signal corresponding to the pressed key is transmitted from the assigned channel in a form in which tone characteristics are controlled in accordance with the touch data of TOUCH, and is emitted by the sound system 28.

Thereafter, in step 134, a countdown subroutine is executed as described later with reference to FIG.
It returns to the routine of the figure.

Old Search Subroutine (FIG. 9) FIG. 9 shows an old search subroutine. In step 140, FF _H (maximum value) is set in LVLMIN and 0 is set in OLD. And step 1
At 42, the control variable i is set to 0, and then the routine proceeds to step 144.

In step 144, the ith event order counter LVL
It is determined whether the value of CNT _i is smaller than the value of LVLMIN. If the result of this determination is affirmative (Y), the flow proceeds to step 146, where LVLMI
Set the value of LVLCNT _{i to} N. Then, in step 148, the value of i is set to OLD.

When the determination result of step 144 is negative (N) or when the process of step 148 is completed, the process proceeds to step 150, and the value of i is increased by one. Then, the process proceeds to step 152.

In step 152, it is determined whether the value of i is smaller than 16. If the determination result is affirmative (Y), the process returns to step 144, and the processes after this step are repeated in the same manner as described above until i = 16. And when i = 16, step
The determination result at 152 is negative (N), and the routine returns to the routine of FIG.

As an example, assuming that a value greater than 0 is set in LVLCNT _{0 to} LVLCNT ₃ and 0 is set in LVLCNT _4, after 0 is set from LVLCNT ₄ to LVLMIN in step 146, OLD is set in step 148. 4 is set. Thereafter, when i = 5 in step 150 and the process proceeds to step 144, the determination result becomes negative (N) because LVLCNT ₅ cannot be smaller than 0, and the process proceeds to step 150. The same applies to i = 6 to 15. Therefore, LVLM
The set value of IN finally becomes 0, and the set value of OLD finally becomes 4.

In this example, for the sake of simplicity, the value of LVLCNT ₄ is set to 0. However, if the value of LVLCNT ₄ is the minimum value other than 0 (for example, 1) among LVLCNT _{0 to} LVLCNT ₁₅ , the value of LVLMIN is When the minimum value is OLD, 4 is the final set value.

Key-Off Subroutine (FIG. 10) FIG. 10 shows a key-off subroutine. In step 160, the control variable i is set to 0.

Next, in step 162, it is determined whether the value of KEY is equal to the value of KCBUF _i and KON _i is 1 (whether the same key code as KEY has been assigned to the i-th channel and the i-th channel is on key-on). . If the result of this determination is negative (N), the operation proceeds to step 164, in which the value of i is increased by 1, and the operation proceeds to step 166.

In step 166, it is determined whether i <16. If the determination result is affirmative (Y), the process returns to step 162, and the processes after this step are repeated in the same manner as described above until i = 16. When i = 16, the determination result of step 166 becomes negative (N). This means that there was no channel to key off.

When the determination result of step 162 is affirmative (Y), the process proceeds to step 168, and the value of i (the number of the key-on channel to which the same key code as KEY is assigned) is set to OFF. Then, the process proceeds to step 170.

In step 170, a key on / off flag corresponding to the OFF value
Set KON (OFF) to 0. In step 172, the event order counter LVLCNT (OFF) corresponding to the OFF value is set.
7F Set _H.

Thereafter, in step 174, key-off processing is performed on the channel corresponding to the OFF value of TG24. As a result, the tone signal being generated is attenuated.

When the determination result of step 166 is negative (N) or when the process of step 174 is completed, the process proceeds to step 176 to execute a countdown subroutine as described later with reference to FIG. Thereafter, the process returns to the routine of FIG.

Countdown Subroutine (FIG. 11) FIG. 11 shows a countdown subroutine. In step 180, the control variable i is set to 0.

Next, in step 182, all the lower 7 bits of LVLCNT _i is "0" or (80 or _H or 00 _H) determine. If the determination result is negative (N) shifts to step 184, to 1 down the value of LVLCNT _i.

When the determination result of step 182 is affirmative (Y) or when the process of step 184 is completed, the process proceeds to step 186, and the value of i is increased by one. Then, the process proceeds to step 188.

In step 188, it is determined whether i <16. If the determination result is affirmative (Y), the process returns to step 182. Then, the processing after step 182 is repeated in the same manner as described above until i = 16.

When i = 16, the result of the determination in step 188 is negative (N), and the routine returns to the original routine (FIG. 8 or FIG. 10).

Modifications The present invention is not limited to the above-described embodiments, but can be implemented in various modifications. For example,
The following changes are possible:

(1) Although various processes such as touch data formation are executed by software, they may be executed by dedicated hardware.

(2) a set value to the event sequence counter (LVLCNT), rather than constant as FF _H, may be variably set in accordance with the key touch strength.

(3) When assigning channels, the channel with the longest elapsed time since the occurrence of the key-on event was selected with reference to the value of LVLCNT, but the channel with the most attenuation was determined with reference to the amplitude value of the envelope waveform. May be selected.

(4) In the embodiment, the three key switches are directly driven by the key members. However, the three key switches may be driven indirectly via, for example, a hammer.

(5) A key switch is used as a key pressing depth detecting means.
Instead of KSW ₁ ~KSW ₃ may be used a pressure-sensitive element or the like. Also,
As a key-on detecting means, instead of providing an independent switch means as in KSW ₃ , the key-on signal is detected by detecting that the output of the pressure detecting means for detecting the intensity of the key touch has reached a predetermined value. That which may occur may occur.

[Effects of the Invention] As described above, according to the present invention, the strength of the key touch and the key-on are detected at a depth deeper than the key-off detection point in response to the pressing of the key. It is possible to perform a rapid continuous performance with a small keystroke, so that the effect of improving the performance of the electronic musical instrument can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an electronic musical instrument according to an embodiment of the present invention, FIG. 2 is a diagram showing key code values for each key name, and FIG. 3 is a configuration of a switch unit for one key. FIG. 4 is a signal waveform diagram for explaining a key operation detection operation, FIG. 5 is a flowchart showing a main routine, FIG. 6 is a flowchart showing a clock interrupt routine, FIG. a flowchart showing a subroutine of KSW ₃ on, FIG. 8 is a flowchart illustrating a subroutine of key-on, Figure 9 is a flowchart illustrating a subroutine of Old search, FIG. 10 is a flowchart showing a subroutine of the key-off, FIG. 11 9 is a flowchart showing a countdown subroutine. 10 data bus, 12 keyboard circuit, 14 panel switch circuit, 16 central processing unit, 18 program memory, 20 register group, 22 conversion table memory, 24 tone generator, 26 clock generator, 28 ... sound system,
KY ... key member, EM ... elastic member, KSW ₁ ~KSW ₃ ... key switch.

Claims (2)

(57) [Claims] (A) first detection means for generating a key-off signal upon detecting that a key has been pressed deeper than a first pressing depth and then returning to a position shallower than the first pressing depth; Each time the key is pressed beyond a second pressing depth that is deeper than the first pressing depth, the strength of the key touch is detected to generate touch data and a key-on signal is generated in response to the key pressing. A key operation detecting device for an electronic musical instrument, comprising: a second detecting unit that generates the key operation. 2. The apparatus according to claim 1, wherein the second detecting means detects when the key is pressed beyond the second pressing depth after passing through the first pressing depth and when the first pressing depth is exceeded. After the first
When the key is pressed again beyond the second pressing depth without returning to the pressing depth of, the touch data having different values is generated for a key touch having the same strength. The key operation detecting device for an electronic musical instrument according to claim 1, wherein: