JPH06195078A - After-touch control unit of electronic musical instrument - Google Patents

Abstract

PURPOSE:To improve the operability of control over a musical tone by an after-touch by performing control so that the value of the after-touch detected by an after-touch detecting means does not affect the musical tone. CONSTITUTION:An initial-touch detecting circuit 18 and an after-touch detecting circuit 20 which are connected to a keyboard 16 are connected to a CPU 10 respectively; and the initial-touch detecting circuit 18 detects an initial touch by keying operation on the keyboard 16 and the after-touch detecting circuit 20 detects the after-touch accompanying the keying operation on the keyboard 16. Then an after-touch control means performs the control according to the detection results of the initial-touch detecting circuit 18 and after-touch detecting circuit 20 so that the value of the after-touch exerts less influence upon the musical tone as the value of the initial touch is large. Therefore, even if the value of the initial touch becomes large, the influence of the after-touch on the musical tone can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to after-sales of electronic musical instruments.
The present invention relates to a touch control device, and more particularly, to an after touch control device for an electronic musical instrument that can detect after-touch associated with a key pressing operation on a keyboard and control musical sounds based on the detection result of the after-touch. .

[0002]

2. Description of the Related Art Generally, in the field of electronic musical instruments equipped with a keyboard, the strength (or speed) with which each key is pressed from the released state (hereinafter referred to as initial touch), and Pressing force (hereinafter referred to as “after touch”) and detecting the tone according to the initial touch value (initial touch data) and after touch value (after touch data) Is being done.

For example, depending on the value of after touch,
You can change the volume, tone color, pitch, etc. of the musical sound,
By changing the amplitude and speed of the vibrato,
It is a practice to give various expressions to musical performances by giving various changes to musical tones.

In order to detect such an after-touch, a sensor including a pressure sensitive element is arranged on the keyboard, and the sensor detects the pressing force associated with the key-pressing operation of the keyboard to detect the after-touch. I am trying to do it.

Therefore, even when the performer does not want to control the musical sound by after-touch, when the performer strongly presses the keyboard (the initial touch is large), the key-pressing operation is interlocked. The after-touch is detected as a result, and the musical tone is controlled by the after-touch.

Conventionally, in order to solve these problems, the following two methods have been performed.

[First Method] After-touch is not detected for a predetermined time interval immediately after the keyboard is pressed to prevent erroneous operation of after-touch detection when the keyboard is strongly pressed. .

[Second Method] The after-touch detection sensitivity can be arbitrarily set. When the musical tone control by the after-touch is not desired, the detection sensitivity is set to be dull and the keyboard is Prevents malfunction of after-touch detection when a key is pressed hard.

[0009]

However, in the above-mentioned first method, even when the tone control by the after-touch is desired immediately after the keyboard operation, the tone control by the after-touch is performed. In addition to that, after a predetermined time interval that is set not to detect after-touch, the after-touch musical tone control is suddenly performed, which is extremely unnatural to the performer and the audience. There was a problem of giving a feeling of hearing.

Further, in the above-mentioned second method, it is difficult to balance the strength with which the performer presses the keyboard and the setting of the aftertouch detection sensitivity, and there is a problem that the operability is poor. there were.

The present invention has been made in view of the above-mentioned various problems of the prior art, and an object of the present invention is to control a musical tone by after-touch when a keyboard is strongly pressed. In order to prevent the malfunction of, it is possible not to give an unnatural sensation to the performer and the audience, and to allow the performer to easily instruct whether or not to control the musical sound by after-touch. An object of the present invention is to provide an after-touch control device for an electronic musical instrument, which has improved operability in controlling musical sounds by after-touch.

[0012]

In order to achieve the above object, an after-touch control device for an electronic musical instrument according to the present invention comprises a key-depressing operation / instruction for generating / stopping a musical tone.
The keyboard for key release operation, the initial touch detection means for detecting the initial touch value of the key depression operation of the keyboard, and the after touch operation for the key depression of the keyboard that affects the musical sound.
The larger the after-touch detection means for detecting the touch value and the initial touch value detected by the initial touch detection means, the more the after-touch value detected by the after-touch detection means does not affect the musical sound. And after-touch control means for controlling as described above.

[0013]

[Function] The value of the initial touch of the key press operation on the keyboard is
It is detected by the initial touch detection means. Also,
The after touch value for keypress operations on the keyboard is
It is detected by the touch detection means.

The after-touch control means controls, based on the detection results of the initial touch detection means and the after-touch detection means, such that the larger the initial touch value, the less the after-touch value affects the musical tone. To do.

Therefore, even if the value of the initial touch becomes large, it is possible to suppress the influence of the musical sound by the after touch.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An after-touch control device for an electronic musical instrument according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an electronic musical instrument having an after-touch control device for an electronic musical instrument according to a first embodiment of the present invention.

This electronic musical instrument is constructed so that the control of its entire operation is controlled by using a central processing unit (CPU) 10. The CPU 10 has a read-only memory (RO) in which a predetermined program for controlling the overall operation and tone color data of musical tones are stored via a bus.
M) 12 and a random access as a working area in which various register groups described later necessary for execution of a program by the CPU 10 described later are set.
The memory (RAM) 14 is connected.

Further, an initial touch detection circuit 18 and an after-touch detection circuit 20 connected to the keyboard 16 are also connected to the CPU 10, and the initial touch detection circuit 18 makes an initial operation by pressing a key on the keyboard 16. A touch is detected, and the after-touch detection circuit 20 detects an after-touch associated with a key depression operation on the keyboard 16.

That is, the keyboard 16 has a plurality of keys (not shown).
In addition, each key is provided with two switches (not shown) for detecting an initial touch, and these switches are connected to the initial touch detection circuit 18. Then, the time from when the first switch is turned on to when the second switch is turned on is counted, and the initial touch data is generated based on the count value. The initial touch data thus generated is input to the CPU 10 and processed by the CPU 10.

Further, the keyboard 16 is provided with a single sensor (not shown) for detecting after-touch, and this sensor is connected to the after-touch detection circuit 20. Then, when the pressing force due to the key pressing operation of the keyboard 16 is applied to the sensor, the after-touch detection circuit 20 generates the after-touch data by detecting the pressing force applied to the sensor, and the after-touch generated in this way. Touch data is input to CPU10, CP
It will be processed in U10.

Further, the CPU 10 includes a timer circuit 22.
Is connected, and the timer circuit 22 interrupts (interrupts) the CPU 10 at a predetermined time interval (for example, “10 msec” interval or the like).

Furthermore, the CPU 10 includes the CPU 10
A tone generator circuit 24 having a plurality of tone generation channels for generating / stopping a tone signal corresponding to a key depression operation / key release operation of the keyboard 16 is connected under the control. An amplifier 26 is connected to the tone generator circuit 24, and a speaker 28 is connected to the amplifier 26. The tone signal output from the tone generator circuit 24 is amplified via the amplifier 26, The sound is emitted from 28 as a musical sound in the space.

As described above, the RAM 14 has C
The registers required when the PU 10 executes the program stored in the ROM 12 are set. Registers relevant to the practice of the invention include: In the following description, the contents (data, etc.) of each register are represented by the same label name unless otherwise specified.

(1) Register THRESHOLD This register is a register for storing the current threshold value.

(2) Register AFT_OLD This register is a register for storing the after-touch value detected last time.

(3) Register AFT_DAT This register is a register for storing the previously supplied value supplied to the musical tone control means.

(4) Register VELO This register is a register for storing the value of the initial touch detected by the initial touch detection circuit 18.

(5) Register T_NOW This register converts the value of the initial touch detected by the initial touch detection circuit 18 as the after-touch threshold and temporarily stores the value of the threshold thus obtained. It is a register to store.

(6) Register AFT_NOW This register is a register for storing the after-touch value detected by the after-touch detection circuit 20.

(7) Register AFT_MAX This register is a register for storing the maximum value of the after-touch value detected by the after-touch detection circuit 20.

(8) Register AFT_TMP This register is a register for storing the value supplied to the musical tone control means obtained this time.

The operation and operation of the electronic musical instrument having the above structure will be described with reference to the flow charts shown in FIGS.

This electronic musical instrument will execute the main routine shown in FIG. 2 when the power is turned on. In the main routine, the key depression / operation of the keyboard 16 is performed.
When the initial touch detection circuit 18 detects the key event generated by the key release operation, the key event processing routine (FIG. 3) is executed. Also,
In this main routine, a timer event generated by the timer circuit 22 interrupts the CPU 10 at a predetermined time interval, and in response to the interrupt by the timer circuit 22, an after touch processing routine (FIG. 4). ), Or other timer processing will be executed.

When the execution of these key event processing routines and after-touch processing routines is completed, the processing returns to the main routine to continue the processing.

That is, normally, the main routine is repeated at high speed, but when there is a key depression operation / key release operation of the keyboard 16, the key event processing routine is executed, and after-touch is performed each time a predetermined time elapses. After the processing routine or the like is started and the key event processing routine or the after-touch processing routine is executed, the main routine is repeated again.

The main routine will be described below with reference to the flowchart shown in FIG.

First, when the main routine shown in FIG. 2 is started by turning on the power, step S202
Initialize is executed to reset the register. That is, the registers for resetting the register THRESHOLD, the register AFT_OLD, and the register AFT_DAT to "0" and for generating other tone signals are also initialized in this step S202. When the process of step S202 is completed, the process proceeds to step S204.

In step S204, it is determined whether or not there is a key event detected by the initial touch detection circuit 18. If the determination result is affirmative (Y), that is, if there is a key event detected by the initial touch detection circuit 18, the process proceeds to step S206 to execute the key event processing routine (FIG. 3),
Key event processing will be performed. This step S
When the key event process of 206 is completed, the process returns to the main routine to continue the process of the main routine.

The key event processing routine will be described later in detail with reference to FIG.

On the other hand, if the determination result of step S204 is negative (N), that is, if there is no key event detected by the initial touch detection circuit 18, the process proceeds to step S208.

In step S208, the timer circuit 22
It is determined whether there is a timer event from. If this determination result is affirmative, that is, if there is a timer event from the timer circuit 22, step S2
The process proceeds to step 10, where the after-touch processing routine (FIG. 4) is executed to perform the after-touch processing.

The after-touch processing routine will be described later in detail with reference to FIG.

When the after-touch process in step S210 is completed, the process proceeds to step S212, and other timer processes are executed. As other timer processing in this step S212, processing other than after-touch processing performed in the after-touch processing of step S210, for example, processing such as temporal change of the volume of the musical sound is performed. At this time, the register AFT__ found in the after touch process of step S210
The value of DAT after touch is used for the process of step S212.

When the process of step S212 is completed, the process proceeds to step S214, and the process for controlling other tone signals is performed.

If the result of the determination in step S208 is negative, that is, if there is no timer event from the timer circuit 22, the process proceeds to step S214, and the process for controlling other musical tone signals is performed. .

In the processing for controlling the other musical tone signals in step S214, all processing except the key event processing and the after touch processing is performed. Also in this processing, the register AFT__ found in the after-touch processing of step S210
The DAT after-touch value will be used.

When the process of step S214 is completed, the process returns to step S204, and steps S204 to S204.
The loop of 214 will be repeated.

Next, the key event processing will be described with reference to the flowchart of the key event processing routine shown in FIG.

In this key event processing routine, first, in step S302, it is determined whether or not the key event that activated this key event processing routine is key-on by a key depression operation. When the result of this determination is negative, that is, when the key event is not the key on (when the key event is the key off by the key release operation), the process proceeds to step S304.

In step S304, the tone generator circuit 2 corresponding to the key-off key number is based on a known technique.
Note-off processing is performed for the four tone generation channels to stop the generation of the tone signal.

When the note-off process in step S304 is completed, the process returns to the main routine.

On the other hand, if the determination result of step S302 is affirmative, that is, if the key event is key-on, the process proceeds to step S306.

In step S306, the initial touch value detected by the initial touch detection circuit 18 is stored in the register VELO, and the value obtained by multiplying the initial touch value VELO by the constant α is stored in the register T.
Store in _NOW. The value T_NOW stored in this register T_NOW becomes the threshold.

When the processing in step S306 is completed, the process proceeds to step S308, and it is determined whether or not the threshold value T_NOW obtained in step S306 is larger than the current threshold value THRESHOLD. If this determination result is affirmative, that is, if the threshold value T_NOW obtained in step S306 is larger than the current threshold value THRESHOLD, the process proceeds to step S310.

In step S310, the value stored in the register THRESHOLD indicating the current threshold value is updated to the threshold value T_NOW obtained in step S306, and the new threshold value THRESHOLD is set, and the flow advances to step S312.

On the other hand, the determination result in step S308 is negative, that is, the current threshold value THRESHOL.
When D is larger than the threshold value T_NOW obtained in step S306, the process proceeds to step S312 without performing any processing.

In step S312, a known technique is used to assign a tone generation channel of the tone generator circuit 24 based on the key number keyed on and the initial touch value VELO, and note-on processing is performed to generate a tone signal. To do. When the process of step S312 is completed, the process returns to the main routine.

Therefore, based on the value of the initial touch detected by the initial touch detection circuit 18 by the key event processing described above, step S
The current threshold value THRESHOLD is determined by the processing of 308 and step S310. Then, the after touch processing routine shown in FIG. 4 is executed by using the threshold value THRESHOLD determined in this way.

In the after-touch processing routine, first, in step S402, the after-touch value detected by the after-touch detection circuit 20 is written in the register AFT_NOW.

When the process of step S402 is completed, the process proceeds to step S404, where the current threshold value THR is set.
It is determined whether EHOLD is "0". This judgment result is negative, that is, the current threshold value TH.
If RESHOLD is not "0", step S4
Go to 06, the current threshold value THRESHO
The LD is decremented by "1", and the process proceeds to step S410 which is the next process.

That is, the current threshold value THR
If EHOLD is not "0", the threshold will decrease with time.

On the other hand, the determination result of step S404 is affirmative, that is, the current threshold value THRESHOL.
If D is “0”, the process proceeds to step S408,
After-touch value A obtained in step S402
FT_NOW and current after touch value AFT_O
It is determined whether LD is equal to or not. If this determination result is affirmative, that is, if the after-touch value AFT_NOW is equal to the current after-touch value AFT_OLD, the after-touch processing routine is ended,
It will return to the main routine.

On the other hand, if the determination result in step S408 is negative, that is, if the after-touch value AFT_NOW and the current after-touch value AFT_OLD are not equal, the process proceeds to step S410.

In step S410, step S402
After-touch value AFT_NOW obtained in
The current after-touch value AFT_OLD is written, and the flow advances to step S412.

In step S412, step S410.
The current after-touch value AFT_OL found in
It is determined whether or not D is greater than the current threshold value THRESHOLD. The determination result of step S412 is positive, that is, the current after-touch value A.
FT_OLD is the current threshold value THRESH
If it is larger than OLD, the process proceeds to step S414.

In step S414, AFT_TMP = AFT_MAX × (AFT_OLD-
THRESHOLD) / (AFT_MAX-THRES
HOLD) is executed, and the value of the operation result of the above-mentioned operation is stored in the register AFT_TMP. When the process of step S414 ends, the process proceeds to step S418.

On the other hand, the determination result of step S412 is negative, that is, the current after-touch value AFT_OLD.
Is less than or equal to the current threshold value THRESHOLD, the process proceeds to step S416 and the register AF
"0" is stored in T_TMP, and the process proceeds to step S418.

In step S418, step S414
Alternatively, it is determined whether or not the after-touch value AFT_TMP obtained in step S416 is equal to the after-touch value AFT_DAT used for controlling the tone signal.

The determination result of step S418 is affirmative, that is, the after-touch value AFT_TMP obtained in step S414 or step S416 and the after-touch value A used to control the tone signal.
If FT_DAT is equal, return to the main routine.

On the other hand, the determination result of step S418 is negative, that is, step S414 or step S416.
After-touch value AFT_TMP calculated in
If the after-touch value AFT_DAT used for controlling the tone signal is not equal, the process proceeds to step S420.

In step S420, the register AFT_
The stored contents of DAT are updated to the value of the register AFT_TMP, and the process returns to the main routine.

In the above-described after-touch processing routine, when the result of the determination in step S412 is negative, that is, when the current after-touch value AFT_OLD is less than or equal to the current threshold value THRESHOLD, the value of the register AFT_TMP is " Then, the after-touch value AFT_DAT used for controlling the tone signal is also set to "0" (steps S418 and S420). Therefore, in this case, steps S312 and S314 are performed.
In, the control of the tone signal based on after touch is not performed.

On the other hand, in the above-mentioned after-touch processing, when the determination result of step S412 is affirmative, that is, when the current after-touch value AFT_OLD is larger than the current threshold value THRESHOLD,
The value of the register AFT_TMP becomes the calculation result in step S414, and the after-touch value AFT_DAT used for controlling the tone signal is also calculated in step S4.
It is set to the value of the calculation result in 14 (steps S418 and S420). Therefore, in this case, step S312 and step S3
At 314, the after-touch value AFT_DAT
Based on the above, the tone signal is controlled by after-touch.

Next, an electronic musical instrument having an after-touch control device for an electronic musical instrument according to a second embodiment of the present invention will be described.

The second embodiment is different from the first embodiment only in that each key of the keyboard 16 is provided with a sensor for detecting after-touch, and therefore, FIG. The accompanying drawings and the detailed description corresponding to the above are redundant and will be omitted.

The RAM 14 of the second embodiment also has registers required when the CPU 10 executes the programs stored in the ROM 12, but the same registers as those of the first embodiment. With regard to (2), the same label name is used to omit redundant description, and the register set only in the second embodiment will be described below.

(1) Register KEY This register is a register for designating a key number.

(2) Register KEY_MAX This register is a register for storing the number of keys on the keyboard 16.

Next, the operation of the electronic musical instrument shown as the second embodiment will be described with reference to the flow charts shown in FIGS.

The electronic musical instrument shown as the second embodiment is similar to the electronic musical instrument shown as the first embodiment.
When the power is turned on, the main routine shown in FIG. 5 is executed.
When the initial touch detection circuit 18 detects the key event generated by the key depression operation / key release operation of 6,
The key event processing routine (FIG. 6) will be executed. In the main routine, a timer event generated by the timer circuit 22 interrupts the CPU 10 at a predetermined time interval, and an after-touch processing routine (corresponding to the interrupt by the timer circuit 22 ( 7) or other timer processing will be executed.

When the execution of the key event processing routine and the after-touch processing routine is completed, the process returns to the main routine to continue the processing.

That is, although the main routine is normally repeated at high speed, the key event processing routine is executed when there is a key depression operation / key release operation of the keyboard 16, and after-touch processing is performed every time a predetermined time elapses. After the routine is started and the key event processing routine and the after-touch processing routine are executed, the main routine is repeated again.

The main routine will be described below with reference to the flowchart shown in FIG.

First, when the main routine shown in FIG. 5 is started by turning on the power, the initialization is executed and the registers are reset.

That is, in step S502, "1" is set in the register KEY, and then the process proceeds to step S504, in which the register THRESHOLD set for each key is set.
D [KEY], register AFT_OLD [KEY] and register AFT_DAT [KEY] are reset to "0". Then, the register KEY is incremented by "1" and the process proceeds to step S506.

In step S506, whether the key number KEY is less than or equal to the value set in the register KEY_MAX,
It is determined whether or not. If the result of this determination is affirmative, that is, if the key number KEY is less than or equal to the value set in KEY_MAX, the processing of steps S504 and S506 is repeated to set all the keys of the keyboard 16 for each key. Register THRESHOLD [KEY],
Register AFT_OLD [KEY] and register AF
Reset T_DAT [KEY] to "0".

On the other hand, if the determination result of step S506 is negative, that is, if the key number KEY is larger than the value set in KEY_MAX (when the initialization of step S504 has been completed for all keys of the keyboard 16), the step In step S508, the registers for generating other tone signals are initialized. When the process of step S508 ends, the process proceeds to step S510.

In step S510, it is determined whether or not there is a key event detected by the initial touch detection circuit 18. This determination result is affirmative, that is, the key detected by the initial touch detection circuit 18
If there is an event, the process proceeds to step S512,
By executing the key event processing routine (Fig. 6),
Event processing will be performed. This step S512
When the key event processing of is finished, the processing returns to the main routine and the processing of the main routine is continued.

The key event processing routine will be described later in detail with reference to FIG.

On the other hand, if the determination result of step S510 is negative, that is, if there is no key event detected by the initial touch detection circuit 18, step S510 is performed.
Proceed to 514.

In step S514, the timer circuit 22
It is determined whether there is a timer event from. If this determination result is affirmative, that is, if there is a timer event from the timer circuit 22, step S5.
After proceeding to step 16, the after-touch processing routine (FIG. 7) is executed to perform the after-touch processing.

The after-touch processing routine will be described later in detail with reference to FIG.

When the after-touch processing in step S516 is completed, the flow advances to step S518 to execute other timer processing. As other timer processing in step S518, processing other than after-touch processing performed in the after-touch processing of step S516, for example, processing such as temporal change of the volume of musical sound is performed. At this time, the register AFT__ found in the after touch process of step S516
The after-touch value of DAT [KEY] will be used in the process of step S518.

When the process of step S518 is completed, the process proceeds to step S520, and the process for controlling other tone signals is performed.

Also, if the result of the determination in step S514 is negative, that is, if there is no timer event from the timer circuit 22, the process proceeds to step S520, and the process for controlling other tone signals is performed. .

In the processing for controlling the other musical tone signals in step S520, all processing other than the key event processing and the after touch processing is performed. Also in this process, the register AFT__ found in the after-touch process of step S516.
The after touch value of DAT [KEY] will be used.

When the process of step S520 is completed, the process returns to step S510, and steps S510 to S510.
The loop of 520 will be repeated.

Next, the key event processing will be described with reference to the flowchart of the key event processing routine shown in FIG.

In this key event processing routine, first, in step S602, the key number of the key event that activated this key event processing routine is stored in the register KEY. When the process of step S602 ends, the process proceeds to step S604.

In step S604, it is determined whether or not the key event that activated the key event processing routine is a key-on caused by a key depression operation. When the result of this determination is negative, that is, when the key event is not the key on (when the key event is the key off by the key release operation), the process proceeds to step S606.

In step S606, "0" is stored in the current threshold value THRESHOLD [KEY] corresponding to the key number KEY stored in the register KEY. After the processing of step S606 is completed, the process proceeds to step S608, and note-off processing is performed on the tone generation channel of the tone generator circuit 24 corresponding to the detected key number KEY based on a known technique to generate a tone signal. To stop.

When the note-off process of step S608 is completed, the process returns to the main routine.

On the other hand, if the determination result of step S604 is affirmative, that is, if the key event is key-on, the process proceeds to step S610.

In step S610, the initial touch value detected by the initial touch detection circuit 18 is stored in the register VELO, and the value obtained by multiplying the initial touch value VELO by the constant α is the detected key number. Current threshold value T corresponding to KEY
Store in HRESHOLD [KEY]. The value stored in this register THRESHOLD [KEY] becomes the threshold.

When the process of step S610 is completed, the process proceeds to step S612, and the tone generation channel of the tone generator circuit 24 is assigned based on the detected key number KEY and the initial touch value VELO by a known technique, and the note-on process is performed. To generate a tone signal. When the process of step S610 is completed, the process returns to the main routine.

Therefore, based on the value of the initial touch detected by the initial touch detection circuit 18 by the key event processing described above, step S
The current threshold value THRE is obtained by the processing of 610.
SHOLD [KEY] will be determined. Then, the threshold value THRES thus determined
The HOLD [KEY] is used to execute the after-touch processing routine shown in FIG. 7.

In the after-touch processing routine, first, in step S702, "1" is set in the register KEY, and the flow advances to step S704.

In step S704, the after-touch value corresponding to the key number KEY detected by the after-touch detection circuit 20 is written in the register AFT_NOW. When the process of step S704 ends, the process proceeds to step S706.

In step S706, step S704
After-touch value AFT_NOW obtained in step A and the current after-touch value A corresponding to the key number KEY
It is determined whether or not FT_OLD [KEY] is equal. If this determination result is affirmative, that is, if the after-touch value AFT_NOW is equal to the current after-touch value AFT_OLD [KEY] corresponding to the key number KEY, the process jumps to step S720.

On the other hand, the determination result in step S706 is negative, that is, the after-touch value AFT_NOW and the current after-touch value AF corresponding to the key number KEY.
If T_OLD [KEY] is not equal, the process proceeds to step S708.

In step S708, step S704
After-touch value AFT_NOW obtained in
Write the current after-touch value AFT_OLD [KEY] corresponding to the key number KEY, and step S71
Go to 0.

In step S710, step S708.
The current after-touch value AFT_OLD [KEY] corresponding to the key number KEY obtained in
Current threshold value THRESH corresponding to EY
It is determined whether or not it is larger than OLD [KEY]. The determination result of step S710 is affirmative, that is, the key number K.
Current after-touch value AFT_O corresponding to EY
When LD [KEY] is larger than the current threshold value THRESHOLD [KEY] corresponding to the key number KEY, the process proceeds to step S712.

In step S712, AFT_TMP = AFT_MAX × (AFT_OLD
[KEY] -THRESHOLD [KEY]) / (AF
T_MAX-THRESHOLD [KEY]) is executed, and the value of the calculation result of the above-mentioned calculation formula is stored in the register AFT_TMP. When the process of step S712 is completed, the process proceeds to step S716.

On the other hand, the result of the determination in step S710 is negative, that is, the current after-touch corresponding to the key number KEY.
The touch value AFT_OLD [KEY] is the key number KE
Current threshold value THRESH corresponding to Y
If LD [KEY] or less, step S714.
Go to and store "0" in register AFT_TMP,
The process proceeds to step S716.

In step S716, step S712 is performed.
Alternatively, it is determined whether or not the after-touch value AFT_TMP obtained in step S714 is equal to the after-touch value AFT_DAT [KEY] used for controlling the tone signal corresponding to the key number KEY.

The determination result in step S716 is positive, that is, the after-touch value AFT_TMP obtained in step S712 or step S714 and the after-touch value used to control the tone signal corresponding to the key number KEY. If AFT_DAT [KEY] is equal, the process proceeds to step S720.

On the other hand, the determination result of step S716 is negative, that is, step S712 or step S714.
After-touch value AFT_TMP calculated in
After-touch value AFT_DAT [KE used to control the tone signal corresponding to the key number KEY
If [Y] is not equal, the process proceeds to step S718.

In step S718, the register AFT_
The stored contents of DAT [KEY] are updated to the value of AFT_TMP, and the process proceeds to step S720.

In step S720, the register KEY is incremented by "1", and the flow advances to step S722.

In step S722, it is determined whether or not the key number KEY is less than or equal to the value set in KEY_MAX. This determination result is affirmative, that is, the key number KEY
Is less than or equal to the value set in KEY_MAX,
By repeating the processing of steps S704 to S722, the register AFT_D for all keys of the keyboard 16 is repeated.
The value of AT [KEY] will be obtained.

On the other hand, when the result of the determination in step S722 is negative, that is, when the key number KEY becomes larger than the value set in KEY_MAX (when the values of the register AFT_DAT [KEY] for all the keys of the keyboard 16 have been obtained). The after-touch processing routine, the process returns to the main routine.

In the after-touch processing routine described above, the determination result of step S710 is negative, that is, the current after-touch value A corresponding to the key number KEY.
FT_OLD [KEY] is the current threshold value THRESHOLD [KE corresponding to the key number KEY.
Y] or less, the value of the register AFT_TMP becomes “0”, and the after-touch value AFT used to control the tone signal corresponding to the key number KEY.
_DAT [KEY] is also set to "0" (steps S716 and S718). Therefore, in this case, step S518 and step S518
At 520, there is no control of the tone signal based on after-touch.

On the other hand, in the after-touch processing described above, the determination result of step S710 is affirmative, that is, the current AF value after-touch corresponding to the key number KEY.
T_OLD [KEY] is the current threshold value THRESHOLD [KEY] corresponding to the key number KEY.
If it is larger, the value of the register AFT_TMP becomes the calculation result in step S712, and the key number KE
The after-touch value AFT_DAT used to control the tone signal corresponding to Y is also set to the value of the calculation result in step S712 (steps S716 and S718). Therefore, in this case, in step S518 and step S520, after-touch control of the tone signal is performed based on the after-touch value AFT_DAT [KEY] corresponding to the key number KEY.

In each of the above-described embodiments, the initial touch value is multiplied by the constant α in order to obtain the threshold value from the initial touch data detected by the initial touch detection circuit 18. However, this constant α may be a constant value written in advance on the program, or by providing a separate operator,
The player may be allowed to make any setting.

Further, instead of multiplying the initial touch value by a constant to obtain the threshold value, another predetermined function is used to obtain the threshold value from the initial touch value. You can
A conversion table for obtaining a threshold value from an initial touch value may be stored in advance in the ROM 12 or the RAM 14, and the conversion table may be read to obtain the threshold value.

Further, in the above-described first embodiment, when the threshold value is not "0", the threshold value is subtracted by "1", but the threshold value is less than "1". The threshold value may be reduced by multiplying by a constant.

That is, the arithmetic expression THRESHOLD = β × THRESHOLD (0 <β <1) may be executed.

Furthermore, in each of the above-described embodiments, the threshold value may be set to "0" after a fixed time regardless of the magnitude of the threshold value obtained from the initial touch value. In this case, the threshold value can be constantly set to "0" in a constant time.

As described above, in the case of decreasing the threshold with time, a method of subtracting a constant value until the threshold becomes "0", or a value such that the threshold becomes "0" after a fixed time is reached. It is possible to arbitrarily select a method of subtracting, a method of exponentially decreasing, or the like.

In the second embodiment described above, too,
Similar to the first embodiment, the threshold value may be subtracted for each timer event. In that case, when the key is turned off, it is not necessary to perform the process of setting the threshold value to "0" (step S606).

In each of the above embodiments, when the after-touch value is constant, the after-touch value actually used gradually increases as the threshold changes, but the after-touch value gradually increases. If the touch values are the same, they may be ignored to suppress the after-touch effect.

Further, in each of the above embodiments, when a new key is played, the new threshold value is set only when the threshold value obtained from the new initial touch is larger than the current threshold value. If it is smaller then it remains at the current threshold value. However, even if the threshold value obtained from the new initial touch is smaller than the current threshold value, the threshold value may be changed to the new threshold value.

Further, in the above two embodiments,
The threshold of after-touch is calculated according to the initial touch to prevent the malfunction of the tone control due to the after-touch, but the threshold is set to "0" and the detection sensitivity of the after-touch depends on the initial touch. It may be set.

That is, in the first embodiment, the after-touch threshold is determined according to the initial touch, and the threshold decreases with time. However, the threshold is set to "0" and the after-touch sensitivity is reduced. It may be set according to the initial touch, and its sensitivity may increase with time.

For example, if the initial touch is large, the sensitivity is set small (for example, "0.1"), and the sensitivity becomes "1" with the lapse of time from the key depression, but the initial touch is small. And increase the sensitivity (for example,
Set to “0.6”. ) May be set so that the sensitivity becomes “1” as time elapses from the key depression, and the detected after-touch value is multiplied by this sensitivity to be supplied to the sound source.

[0137]

Since the present invention is constructed as described above, it has the following effects.

A keyboard for performing a key-depressing operation / key-releasing operation for instructing the generation / stop of a musical sound, an initial touch detection means for detecting an initial touch value of a key pressing operation on the keyboard, and an influence on a musical sound After touch detection means for detecting the after touch value of a given key depression operation, and the larger the initial touch value detected by the initial touch detection means, the after touch detected by the after touch detection means. Since it is configured to have an after-touch control means for controlling the touch value so as not to affect the musical sound, the initial touch value of the keyboard key depression operation is detected by the initial touch detection means, and The after touch value of the key depression operation of the keyboard is detected by the after touch detection means.

Then, the after-touch control means is based on the detection results of the initial touch detection means and the after-touch detection means so that the larger the initial touch value, the less the after-touch value influences the musical sound. Therefore, even if the value of the initial touch becomes large, it is possible to suppress the influence of the musical sound due to the after touch.

Therefore, according to the present invention, in preventing the malfunction of the musical tone control due to the after-touch when the keyboard is strongly depressed, the performer and the audience are not given an unnatural sensation, and the performance is prevented. Since the person can easily instruct whether or not to control the musical sound by the after-touch, the operability of controlling the musical sound by the after-touch can be significantly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electronic musical instrument including an after-touch control device for an electronic musical instrument according to the present invention.

FIG. 2 is a flowchart showing a main routine according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a key event processing routine according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing an after-touch processing routine according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing a main routine according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing a key event processing routine according to the second embodiment of the present invention.

FIG. 7 is a flowchart showing an after-touch processing routine according to the second embodiment of the present invention.

[Explanation of symbols]

 10 CPU 12 ROM 14 RAM 16 Keyboard 18 Initial Touch Detection Circuit 20 After Touch Detection Circuit 22 Timer Circuit 24 Sound Source Circuit 26 Amplifier 28 Speaker

Claims (1)

[Claims] 1. A key depression operation for instructing generation / stop of a musical sound /
A keyboard for performing a key release operation, an initial touch detection means for detecting an initial touch value of the key depression operation of the keyboard, and an after touch value of the key depression operation of the keyboard that affects the musical sound. After touch detection means for detecting, and the larger the value of the initial touch detected by the initial touch detection means, the after touch value detected by the after touch detection means does not affect the musical sound. After-touch control device for electronic musical instrument, comprising: