JP5444719B2 - Automatic performance electronic piano control device and program for realizing the control method - Google Patents

Description

The present invention relates to an automatic performance electronic piano control device that drives and controls each key of an electronic piano in accordance with automatic performance, and a program for realizing the control method .

  2. Description of the Related Art Control devices that automatically drive and control each key of a piano are conventionally known.

  There is a so-called automatic piano in which such a control device is applied to an acoustic piano to perform automatic performance. The automatic piano is configured so that each key can be driven by an actuator such as a solenoid, and the corresponding actuator is controlled based on pre-recorded performance information (piano roll or MIDI (musical instrument digital interface) data). Drive the corresponding key. As a result, the hammer linked to the key is driven and struck to achieve automatic performance. As described above, in the automatic piano, the musical sound is generated when the hammer actually strikes the strings, so the hammer drive control, that is, the actuator drive control is feedback-controlled based on the performance information and the key operation position and speed. Is done.

  On the other hand, an electronic piano is equipped with an electronic sound source, and automatically performs performance by supplying musical sound parameters generated by reproducing pre-stored performance data (MIDI data) to the electronic sound source and generating sound from the electronic sound source. I am doing so. That is, the electronic piano is different from the automatic piano in that it can be automatically played without driving a key. Recently, however, electronic pianos have been commercialized in which musical sounds are generated from an electronic sound source and keys are automatically driven from the viewpoint of expressing a musical instrument. It is theoretically possible to apply the automatic piano feedback control to the electronic piano key drive control. However, when the feedback control is applied, a high-performance drive device or key sensor is required. Calculation processing increases, manufacturing costs increase, and the load on the CPU increases. Therefore, it is not effective to apply the feedback control to the key drive control of an electronic piano where the key drive is not directly linked to the sound of a musical tone.

  In order to eliminate the increase in the manufacturing cost and the load on the CPU, an electronic piano control device in which feedforward control is applied to the key drive control has also been proposed (for example, see Patent Document 1). In this electronic piano control device, the entire key stroke (stroke from key release to key release through key depression) is divided into a plurality of operation sections, and a key drive control value is set for each operation section. Specifically, key information representing key pressing and key release by stepwise switching the duty ratio of a PWM (pulse width modulation) waveform signal supplied to the power supply unit that supplies power to the solenoid In the key pressing operation and the key releasing operation corresponding to the above, generation of noise due to collision between various members and damage to the collision portion are suppressed.

  Further, similarly to the above-described conventional electronic piano control device, the power supplied to the solenoid is controlled by switching the duty ratio of the PWM waveform signal, and by the collision between various members in the key pressing operation and the key releasing operation. Although it suppresses the generation of noise, unlike the conventional electronic piano control device, the contact time difference type 2-make type that switches the duty ratio of the PWM waveform signal on / off as the key rotates. There is also a control device for an electronic piano that is performed in accordance with ON / OFF of each contact point of the touch response switch (see, for example, Patent Document 2).

JP 2008-238828 A Japanese Patent Laid-Open No. 10-171447

  However, any of the above-described conventional electronic piano control devices has been difficult to perform stable key driving in re-keying at the time of key release.

  That is, in the former of the above-mentioned conventional electronic piano control devices, the key stroke from key release to key press and the key release stroke from key press to key release are each divided into a plurality of operation sections, The key-driven control value is changed for each operation section, and in the case of re-keying at the time of key release, the timing at which the re-key is instructed is included in any of the operation sections divided into a plurality of key release strokes. Depending on whether or not, the operation section divided into a plurality of times during the key depression stroke returns to one of the operation sections specified in advance, and the drive control is continued from the operation section. In short, the drive control of the normal keystroke (a part thereof) is also used for the rekeying at the time of key release. However, since the required driving current is different between normal key pressing and re-keying at the time of key release, it is difficult to optimally control both keys by only driving control of one of the keys. Then, the actual situation is that the normal keystroke drive control is compromised to match the keystroke drive control at the time of key release.

  On the other hand, the latter of the above-described conventional electronic piano control devices does not particularly mention re-key drive control at the time of key release.

The present invention has been made paying attention to this point, and an automatic performance that enables stable key drive control in re-keying at the time of key release with the simplest possible keyboard and drive device configuration. An object of the present invention is to provide an electronic piano control device and a program for realizing the control method .

In order to achieve the above object, the automatic performance electronic piano control device according to claim 1 drives each of a plurality of keys independently or drives each member linked to each of a plurality of keys independently. A key that performs a key pressing operation for each key, including a key pressing operation for displacing the key from the initial position before the key pressing to the key pressing position and a key releasing operation for displacing the key from the key pressing position to the initial position A key that controls a key pressing operation of the corresponding key by supplying a driving signal to the key driving unit in accordance with key information representing key pressing and key release supplied over time with the driving unit. Drive control means and storage means for storing a plurality of types of drive signal patterns for the key drive control means to control the key pressing and releasing operation of the corresponding key , wherein the plurality of types of drive signal patterns include Press and release key for time A first drive signal pattern defining a drive signal for generating a preset driving force at each stage obtained by dividing the stage into a plurality of stages, and at least one of the stages of the first drive signal pattern For some keys, a storage means for storing a second drive signal pattern that stipulates a drive signal that generates a different drive force in a different division from the first drive signal pattern, and for each key. By determining whether or not key information representing the key depression again is supplied to the key during the key release operation from the start of the key operation to the end of the key release operation, and a re-keying determining means for determining whether an instruction, the key actuation control means, the result of the determination by re-keying determining means, when the instruction of re-keying is not performed, the first drive While using No. pattern, when the instruction of re-keying is performed, using the second drive signal pattern, and controlling the key depression and key release operation of the corresponding key.

  The control device for an automatic performance electronic piano according to claim 2 is the control device for an automatic performance electronic piano according to claim 1, wherein after the supply of key information representing key release for each key starts, Measuring means for measuring the elapsed time until key information representing key depression is supplied, and the elapsed time measured by the measuring means is a predetermined time from the start of the key release operation of the corresponding key to the end of the key release operation. And an elapsed time determining means for determining whether or not one of the plurality of partial sections obtained by dividing the plurality of partial sections, wherein the elapsed time is determined by the elapsed time determining means. When it is determined that it corresponds to one of the sections, the key drive control means controls a key pressing / release operation of the corresponding key using a key pressing operation drive signal that differs depending on the corresponding partial section. It is characterized by.

The control device of the automatic performance electronic piano according to claim 3, in the control device of the automatic playing electronic piano according to claim 2, wherein the second drive signal pattern is a driving signal pattern press key operation, the key depression It is composed of a plurality of drive signals that change so as to generate a driving force that changes stepwise in the operation region, and the elapsed time determination means determines that the elapsed time corresponds to one of the plurality of partial sections. The key driving control means controls the key pressing operation of the corresponding key by using a driving signal at a different stage depending on the corresponding partial section in the key pressing driving signal pattern. It is characterized by.

A control system for an automatic playing electronic piano according to claim 4, in the control device of the automatic playing electronic piano according to claim 2, wherein the second drive signal pattern, a plurality of key depression corresponding to the number of prior SL subinterval The drive signal patterns for operation, each of which is constituted by an independent one , and when the elapsed time determining means determines that the elapsed time corresponds to one of the plurality of partial sections, the key drive control means Selects one of the plurality of key pressing operation drive signal patterns in accordance with the corresponding partial section, and uses the selected key pressing operation drive signal pattern to press the corresponding key. The key release operation is controlled.

The automatic performance electronic piano control device according to claim 5 is the automatic performance electronic piano control device according to any one of claims 1 to 4, wherein the key pressing position is determined by the key displacement corresponding to the key release / release operation. Further includes detection means for outputting a corresponding detection signal to detect that has reached one of a plurality of predetermined positions, and the key drive control means is responsive to the detection signal output from the detection means. Switching a step in the selected drive signal pattern and supplying a drive signal corresponding to the switched step to the key driving means to control a key pressing operation of the corresponding key. To do.
In order to achieve the above object, the program according to claim 6 can be realized by the same technical idea as that of claim 1.

According to the first or sixth aspect of the present invention, when a rekeying instruction is not given as a result of the determination by the rekeying determination means , the first driving signal pattern is used while a rekeying instruction is given. sometimes, by using the second drive signal pattern, since the key depression and key release operation of the corresponding key is controlled, when it is determined that the re-keying is instructed by the re-keying determining means re-keying dedicated second using the drive signal pattern, it is possible to stabilize the drive control of the re-keying when the corresponding key.

  According to the second aspect of the present invention, the plurality of partial sections obtained by dividing the elapsed time measured by the measuring means by dividing a predetermined time from the start of the key release operation of the corresponding key to the end of the key release operation. When it is determined that any one of the above is satisfied, the key pressing operation of the corresponding key is controlled using a different key pressing operation drive signal according to the corresponding partial section. By supplying different driving signals to the key driving means according to the operating state, the key pressing and releasing operation of the corresponding key is controlled, so that the driving control at the time of re-keying the corresponding key is made more efficient and stabilized. It becomes possible.

According to the third aspect of the present invention, the storage means has the second drive signal pattern dedicated to rekeying selected when it is determined that rekeying is instructed by the rekeying determination means, Since it is sufficient to store two types of drive signal patterns of the first drive signal pattern for normal keystroke, the storage capacity of the storage means can be reduced.

  According to the invention described in claim 4, the plurality of partial sections obtained by dividing the elapsed time measured by the measuring means by dividing a predetermined time from the start of the key release operation of the corresponding key to the end of the key release operation. When it is determined that any one of them is selected, one of the plurality of independent key pressing operation drive signal patterns is selected according to the corresponding partial section, and the selected key pressing operation is selected. Since the corresponding key pressing / releasing operation is controlled using the drive signal pattern, the drive control at the time of re-keying the corresponding key can be performed more finely.

  According to the fifth aspect of the present invention, the steps in the selected drive signal pattern are switched in accordance with the detection signal output from the detection means and indicating the specific pressing position of the key. By supplying the driving signal corresponding to the key driving means, the key pressing operation of the corresponding key is controlled, that is, the driving force of the key is controlled according to the specific pressing position of the key. Thus, it becomes possible to perform the drive control more finely when the corresponding key is re-keyed.

It is a block diagram which shows schematic structure of the electronic piano to which the control apparatus which concerns on the 1st Embodiment of this invention is applied. It is a block diagram which shows the control structure which controls the drive of each key of the keyboard apparatus in FIG. FIG. 2 is a sectional view of the keyboard device in FIG. 1 in a non-key-pressed state. It is sectional drawing of the key pressing state of the keyboard apparatus in FIG. FIG. 4 is a plan view of the drive unit in FIG. 3. It is a figure which shows an example of a structure of the table for key drive. It is a flowchart which shows the procedure of the automatic performance processing program performed by CPU in FIG. It is a flowchart which shows the detailed procedure of the key drive event processing subroutine in FIG. It is a flowchart which shows the detailed procedure of the key drive-off process subroutine in FIG. It is a flowchart which shows the detailed procedure of the rekeying process subroutine in FIG. FIG. 11 is a flowchart showing a continuation procedure of the rekeying process subroutine of FIG. 10. FIG. It is a flowchart which shows the detailed procedure of the key drive control processing program run by CPU in FIG. It is a flowchart which shows the procedure of the continuation of the key drive control processing program of FIG. It is a flowchart which shows the procedure of the continuation of the key drive control processing program of FIG. It is a flowchart which shows the procedure of the continuation of the key drive control processing program of FIG. 13 is a flowchart showing a detailed procedure of a rekey key drive control processing subroutine in FIG. 12. It is a figure which shows an example ((b)) of a duty ratio table for re-keying corresponding to an example ((a)) of duty ratio table (for basic operation) and the duty ratio table. It is a flowchart which shows the detailed procedure of the rekeying process subroutine performed by CPU of the electronic piano to which the control apparatus which concerns on the 2nd Embodiment of this invention is applied. FIG. 19 is a flowchart showing a continuation procedure of the rekeying process subroutine of FIG. 18. FIG. It is a flowchart which shows the detailed procedure of the rekey key drive control processing subroutine performed by CPU of the electronic piano to which the control apparatus which concerns on the 2nd Embodiment of this invention is applied. It is a flowchart which shows the detailed procedure of the rekeying pattern A control processing subroutine in FIG. FIG. 21 is a flowchart showing a detailed procedure of a rekeying pattern B control processing subroutine in FIG. 20. FIG. FIG. 21 is a flowchart showing a detailed procedure of a rekeying pattern C control processing subroutine in FIG. 20. FIG. Of the duty ratio table of FIG. 17 (a), the portion corresponding to the third to fifth states ST3 to ST5 ((a)) and the rekey key duty ratio tables A, B and C respectively corresponding to this portion. It is a figure which shows each example ((b)-(d)).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a schematic configuration of an automatic performance electronic piano (hereinafter abbreviated as “electronic piano”) to which the control device according to the first embodiment of the present invention is applied.

  As shown in the figure, the electronic piano of the present embodiment includes a setting operator 1 including a plurality of switches, wheels, and joysticks for inputting various types of information, and a detection circuit that detects the operation state of the setting operator 1. 2, a keyboard device 3 for inputting performance information including pitch information, a CPU 4 for controlling the entire device, a control program executed by the CPU 4, a ROM 5 for storing various table data, etc., and song data A RAM 6 that temporarily stores various input information and calculation results, a timer 7 that measures interrupt time and various times in timer interrupt processing, and displays various information such as a liquid crystal display (LCD) and a light emitting diode ( LED) and the like, various application programs including the control program, various music data, various data Is connected to an external device 100 such as an external MIDI device, and a communication interface (I / F) 10 for transmitting / receiving data to / from the external device 100 and performance information input from the keyboard device 3 Or a sound source 11 that converts performance information obtained by automatically reproducing any piece of music data stored in the external storage device 9 into an audio signal, and appropriately applies an effect to the audio signal. For example, a sound system 12 such as a DAC (digital-to-analog converter), an amplifier, or a speaker.

  The above components 2 to 11 are connected to each other via a bus 13, a timer 7 is connected to the CPU 4, an external device 100 is connected to the communication I / F 10, and a sound system 12 is connected to the sound source 11. ing. Here, the communication I / F 10 is not limited to a wired system but may be a wireless system. In addition, both types may be provided.

  The external storage device 9 is, for example, a storage medium such as a flexible disk (FD), a hard disk (HD), a CD-ROM, a DVD (digital versatile disc), a magneto-optical disk (MO), and a semiconductor memory, and a driving device thereof. The storage medium may be detachable from the drive device, or the external storage device 9 itself may be detachable from the electronic piano of the present embodiment. Alternatively, neither the storage medium nor the external storage device 9 may be detachable. As described above, the external storage device 9 can also store a control program to be executed by the CPU 4. If the control program is not stored in the ROM 5, the control program is stored in the external storage device 9. By reading it into the RAM 6, it is possible to cause the CPU 4 to perform the same operation as when the control program is stored in the ROM 5. In this way, control programs can be easily added and upgraded.

  In the illustrated example, the external device 100 is connected to the communication I / F 10, but the present invention is not limited to this. For example, a server computer is connected via a communication network such as a LAN (local area network), the Internet, or a telephone line. You may be made to do. In this case, if the above programs and various parameters are not stored in the external storage device 9, the communication I / F 10 is used to download the programs and parameters from the server computer. The electronic piano as a client transmits a command for requesting downloading of a program and parameters to the server computer via the communication I / F 10 and the communication network. Upon receiving this command, the server computer distributes the requested program and parameters to the electronic piano via the communication network, and the electronic piano receives these programs and parameters via the communication I / F 10 and stores them externally. Downloading is completed by accumulating in the device 9.

  FIG. 2 is a block diagram showing a control configuration for controlling the driving of each key of the keyboard device 3. However, FIG. 2 also shows the CPU 4 for convenience of explanation.

  As shown in the figure, the keyboard device 3 includes a keyboard 3a having a plurality of keys (for example, 88 keys) and a solenoid 3b1 provided for each key (in FIGS. 3 and 4 described later, an actuator including a solenoid). 330), a power control unit 3c for controlling the driving of each solenoid 3b1, and a key switch (key switch SW in FIGS. 3 and 4) provided on each key. The scan unit 3d that detects the / off state and the bus 3e that connects the drive control unit 3c, the scan unit 3d, and the CPU 4 are mainly configured.

  The keyboard 3a is divided into four key ranges of “low range”, “middle low range”, “middle high range” and “high range” (22 keys belong to each key range). Power supply to each of the 22 solenoids 3b1 belonging to the range is controlled by one power supply unit 3b for each key range. Furthermore, one power supply unit 3b is controlled by one drive control unit 3c. Needless to say, the key area division mode and the number of divisions are not limited thereto.

  The drive control unit 3c is controlled by the CPU 4 that functions as the drive control processing unit 4a. Specifically, when it is desired to drive a certain key in the key pressing direction, the drive control processing unit 4a has one drive control unit 3c (four drive controls) in charge of driving control of the key (solenoid 3b1). Search for one of the units 3c, specify the searched drive control unit 3c, and transmit the key number (number given to each key) of the key and drive-on on the bus 3e (hereinafter referred to as “drive”). The request to turn on ”is received by the designated drive control unit 3c. Upon receiving the drive-on request, the drive control unit 3c gives a predetermined PWM waveform at a predetermined timing to the power supply unit 3b so that power is supplied to the key solenoid 3b1 described in the drive-on request. Supply signal. In response, a predetermined amount of power is supplied to the solenoid 3b1 from the power supply unit 3b, and the solenoid 3b1 pulls down the corresponding key stepwise in the pressing direction. On the contrary, when it is desired to drive a certain key in the key release direction, the drive control processing unit 4a searches for one drive control unit 3c responsible for drive control of the key (solenoid 3b1), When the searched drive control unit 3c is designated and the key number and the drive off of the key are transmitted on the bus 3e (hereinafter referred to as “drive off request”), the drive off request is transmitted by the designated drive control unit 3c. Received. Upon receiving the drive-off request, the drive control unit 3c gradually supplies the PWM waveform signal to the power supply unit 3b so that power is not supplied to the key solenoid 3b1 described in the drive-off request. To stop. Accordingly, power is not supplied to the solenoid 3b1 stepwise from the power supply unit 3b, so that the pulling operation for the solenoid 3b1 is stopped and the key is pulled up in the key release direction.

  The power supply unit 3b also has an error notification function that detects a failure (such as abnormal heat generation) of the solenoid 3b1 in hardware and notifies the drive control unit 3c of the failure. When an error notification is transmitted from the power supply unit 3b, the drive control unit 3c transfers the error notification to the drive control processing unit 4a.

  Each key is provided with one key switch as described above. In this embodiment, a contact time difference type three-make touch response switch is employed as the key switch. The scanning unit 3d scans the three contacts provided in each key switch (first to third switches SW1 to SW3 in FIGS. 3 and 4) at predetermined time intervals, Detect on / off state. The detected ON / OFF state of each contact for each key is transmitted to the drive control processing unit 4a via the bus 3e. Note that the number of make-ups of the key switch is not limited to three, but may be four or more. However, in the case of two or less, information used for key drive control is insufficient, which is not realistic. On the other hand, for example, when using an optical sensor, that is, a high-performance key sensor, in order to detect the pressed position in the entire process from the non-pressed state to the deepest pressed state for each key, for example, As described in the background art, since the object and purpose of the present invention are diminished due to an increase in manufacturing cost, it is not realistic.

  3 and 4 are cross-sectional views of the keyboard device 3. FIG. 3 shows a non-pressed state of the key, and FIG. 4 shows a pressed state of the key.

  In FIG. 3, the entire musical instrument main body of the electronic piano of the present embodiment is not shown, but corresponds to the shelf 315 and the portion above it. A keyboard chassis (hereinafter simply referred to as “chassis”) 314 is disposed and fixed on the shelf board 315. The chassis 314 is fixed to the shelf plate 315 with a fastener (not shown) or the like. Hereinafter, the player side (left side in FIG. 3) of the electronic piano of the present embodiment will be referred to as “front”.

  From the front part of the chassis 314 to the front part of the shelf board 315, a mouth bar part 317 is provided over the entire key width. The front portion of the chassis 314 is pressed against the shelf plate 315 by the mouth bar portion 317 through the metal fitting 318 and the elastic material 319.

  A plurality of keys 310 and hammer bodies HM corresponding to the keys 310 are individually supported on the chassis 314. The key 310 is operated to be pressed and can be pivoted in the vertical direction (the front end swings) about the rear key pivot fulcrum PK. There are a plurality of white keys 310W and black keys 310B as the keys 310, respectively. A hammer body driving unit 311 is provided at the lower front portion of each key 310.

  Below each key 310, a hammer body HM is arranged corresponding to each key 310. The chassis 314 is provided with a hammer body rotation shaft PH corresponding to each hammer body HM, and each hammer body HM rotates in the vertical direction around the corresponding hammer body rotation shaft PH (the rear end portion swings). Movement) is free. Further, the engaging portion 321 of the hammer body HM is always in engagement with the hammer body driving portion 311 of the key 310, and the hammer body HM is rotated in conjunction with the key 310. In response to the key pressing operation by the player, the engaging portion 321 is driven by the hammer body driving portion 311 of the key 310, and the hammer body HM is counterclockwise (corresponding to the key pressing direction) about the hammer body rotation axis PH. By rotating in the direction of movement), an appropriate inertia is imparted and a good key pressing feeling is obtained. The configuration of each key 310 and the configuration of each hammer body HM are the same. In addition, in order to realize key scaling of the key press feeling, the length and weight of the hammer body HM may be made different for the white key and the black key or according to the pitch.

  In the hammer body HM, a mass member 323 is extended from the base 322 behind the hammer body rotation shaft PH. The hammer body HM is always urged clockwise by the weight of the mass member 323 (the direction corresponding to the key release direction), and the position of the hammer body HM shown in FIG. The position in the key state.

  The return force of the key 310 from the depressed state is due to the return force of the hammer body HM due to the weight of the mass member 323. Also at the time of return, the hammer body HM rotates in conjunction with the corresponding key 310.

  An upper stopper 312 and a lower stopper 313 such as felt are provided on the upper rear portion and the lower rear portion of the chassis 314, respectively. The upper stopper 312 abuts against the mass member 323 of the hammer body HM when the key is depressed, and restricts the key depression end position of the key 310 (see FIG. 4). The lower stopper 313 contacts the mass member 323 when the key is not pressed, and restricts the return position of the key 310 to the non-key pressed state (see FIG. 3).

  In addition, the electronic piano of the present embodiment is provided with a 3-make key switch SW on a switch board 326 disposed at the front of the chassis 314. As described above, the key switch SW is provided with the first to third switches SW1 to SW3. When the key is depressed, that is, when the switch pressing portion 324 is displaced downward, the first switch SW1, the second switch SW2, and the third switch SW3 are switched from OFF to ON in this order. If the key depression is maintained, the first to third switches SW1 to SW3 are kept in the on state. On the other hand, when the key is released, that is, when the switch pressing portion 324 is displaced upward, the third switch SW3, the second switch SW2, and the first switch SW1 are switched from on to off in this order. The on / off state of the first switch SW1 corresponds to the damper off (release) / on (hold) state of an acoustic piano, the off state of the second switch SW2 corresponds to the key off (silence instruction), and the third switch. SW3 ON corresponds to key-on (sound generation instruction). The key switch SW is pressed and driven by the switch pressing unit 324 of the hammer body HM, and performs a key operation including key velocity (detected based on a time difference from turning on the second switch SW2 to turning on the third switch SW3). To detect. In the case of a key pressing operation by a player, that is, a real-time performance, tone control is performed based on the detection result of the switch pressing unit 324.

  The electronic piano of the present embodiment is also provided with a drive unit UNT as a key drive means for automatic performance. FIG. 5 is a plan view of the drive unit UNT. The drive unit UNT includes a magnetically permeable upper yoke 335 and a lower yoke 340. The upper yoke 335 and the lower yoke 340 have a full key width. The drive unit UNT includes actuators (solenoids) 330 for all keys corresponding to each hammer body HM. The actuators 330 are arranged in a straight line, that is, in a staggered manner, in parallel in the front row and the rear row along the key arrangement direction. All the actuators 330 are configured in the same manner except for their arrangement positions.

  As shown in FIG. 3, the upper yoke 335 is integrally formed in a U-shaped cross section that opens downward. The lower yoke 340 includes a concave portion 343 having a U-shaped cross section for receiving the upper yoke 335, a rear horizontal portion 341 extending backward from the concave portion 343, and a front horizontal portion 342 extending forward from the concave portion 343. And integrally formed. The rear horizontal portion 341 is sufficiently long rearward and extends further to the rear than the tip of the mass member 323. Since the lower yoke 340 has a concave portion 343 having a U-shaped cross section and is an inverted hat type, the rigidity of the lower yoke 340 is increased.

  The shelf plate 315 is formed with a mounting hole 315b (see FIG. 3) having a length extending at least over the entire key width. The upper yoke 335 is accommodated in the concave portion 343 of the lower yoke 340, whereby the actuator 330 including a portion where the upper yoke 335 and the lower yoke 340 overlap is located in the mounting hole 315b. This position is close to the hammer body rotation axis PH. From the viewpoint of reducing the stroke of the plunger 333, the position of the actuator 330 is between the key rotation fulcrum PK and the hammer body rotation axis PH and as close as possible to the hammer body rotation axis PH. It is preferable to arrange.

  As shown in FIG. 3, in each actuator 330, a solenoid coil 332 is wound around the bobbin 331 inside the upper yoke 335. A plunger 333 is disposed inside the bobbin 331 so as to be able to reciprocate in the vertical direction. A drive unit 334 made of an elastic material is provided on the top of the plunger 333. Each actuator 330 is formed by using a portion where the upper yoke 335 and the lower yoke 340 overlap as a main magnetic path.

  The upper yoke 335 and the lower yoke 340 are fixed by a plurality of screws 337 (see FIGS. 3 and 5). The fixing with the screw 337 also serves to fix the bobbin 331 and the solenoid coil 332 between the upper yoke 335 and the lower yoke 340. Since the actuators 330 are arranged in a staggered manner, the winding diameter (bobbin 331 diameter) of the solenoid coil 332 of each actuator 330 can be increased and the number of windings can be set large, which is advantageous for efficient improvement of the driving force. ing.

  As shown in FIG. 3, the drive unit UNT includes a plurality of screws 329 through the mounting holes 341ab and 342ab (see FIG. 5) of the lower yoke 340, and the mounting portion 314a and the front lower portion of the rear portion of the chassis 314. Are fastened and fixed to the mounting portion 314b.

  A substrate 344 for controlling the operation of the drive unit UNT is fixed by a plurality of screws 346 immediately behind the drive unit UNT and below the shelf plate 315. Further, a unit cover 345 that covers the drive unit UNT and the substrate 344 from below is provided. The unit cover 345 is made of sheet metal, resin, or the like, and front and rear attachment portions 345b are fixed to the lower surface of the shelf board 315 by a plurality of screws 347.

  In the non-key-pressed state, the drive unit 334 of the actuator 330 is close to the corresponding hammer body HM. In the non-key-pressed state, the drive unit 334 may abut on the hammer body HM. When the solenoid coil 332 is energized, the plunger 333 moves upward and pushes up and drives the hammer body HM through contact between the drive unit 334 and the hammer body HM. Then, in conjunction with the hammer body HM, the key 310 rotates in the key pressing direction (the direction in which the tip of the key 310 is displaced downward) (see FIG. 4).

  When the energization is released, the plunger 333 is pushed by the hammer body HM along with the return of the hammer body HM and the key 310, and returns to the original initial position (position shown in FIG. 3) by its own weight.

  In this embodiment, a keyboard device that drives a key through a hammer body is used. However, the present invention is not limited to this, and the keyboard device is driven directly without using a hammer body. May be adopted. In this case, there are a structure with a hammer body and a structure without a hammer body, but any structure may be adopted.

  Further, in the present embodiment, the lower yoke 340 is fixed to the chassis 314, and the chassis 314 to which the lower yoke 340 is fixed is fixed to the shelf plate 315 with the fastener or the like. Both the lower yoke 340 and the chassis 314 may be fastened and fixed to the shelf plate 315 directly by screws, for example.

  The electronic piano constructed as described above, in particular, the automatic key drive control process executed by the CPU 4 will be described in detail with reference to FIGS. explain. The same key repetitive operation is an operation in which the same key repeats an on / off operation within a short time by automatic key drive control. Basic operation is a basic operation in which each key does not perform special operations such as repeated keystrokes during the entire process from the non-pressed state to the non-pressed state via the deepest pressed state. It is. As a special operation, in addition to the same key repetitive operation, multiple key repetitive operation in which a plurality of keys are turned on within a short time by the automatic key drive control and the on state is maintained at the same time. Although there are “competitive operations with manual performance” which are operations when a manual performance is performed during drive control, these operations are not considered in this embodiment. The reason for this is to explain the feature of the present invention, that is, the feature that the type of duty ratio table to be used differs depending on the timing when the key depression is instructed (the timing when the drive-on event is read). This is because it is sufficient to describe only “same key repeated operation” and “example”. As described above, in the present embodiment, the above-mentioned “multi-key repeated operation” and “competitive operation with manual performance” are not considered for the convenience of explanation. The present embodiment is configured based on the embodiment of Patent Document 1 described above. The embodiment of Patent Document 1 includes a control process for “multi-key repeated operation” and “competitive operation with manual performance”. Therefore, the present invention can be easily applied to "multi-key repeated operation" and "competitive operation with manual performance" based on the description of the control processing.

(1) Basic operation When a user operates a mode switch (not shown) included in the setting operation element 1 to select an automatic performance mode, for example, a song selection instruction is given to the display 8 by executing a program (not shown). Is displayed. Then, the user selects a desired song stored in the external storage device 9 by operating a predetermined operator included in the setting operator 1 in accordance with this instruction. As a result of this selection, the music data and key driving data of the selected music are read from the external storage device 9, and the music data storage area and the key driving data storage area (both not shown) secured at predetermined positions in the RAM 6 are displayed. Respectively). If the song data of the song desired by the user and the key driving data are not stored in the external storage device 9, the user or automatically, outside the electronic piano of the present embodiment, for example, the external The music data and key driving data may be taken into the RAM 6 from the device 100 via the communication I / F 10.

  The music data used in this embodiment includes a header, a series of event data, generation timing data, and end data. The header is composed of a plurality of data representing a song title, initial tone color, volume, performance tempo, and the like. The event data includes key-on event data, key-off event data, musical tone control event data, tempo event data, and the like. The key-on event data has a key code KC representing the pitch of the generated musical sound and a key-on KON representing the generation start of the musical sound. The key-off event data includes a key code KC that represents the pitch of the musical sound that is being generated and a key-off KOF that represents the stop of the musical sound. The musical tone control event data includes control data for controlling the tone color and volume of the generated musical tone. The generation timing data is provided accompanying (adjacent to) each event data, and has a tempo clock timing TCLT that represents the generation timing of the event data in the music. Tempo event data has control data for changing the tempo of automatic performance. End data represents the end of song data.

  On the other hand, the key driving data used in the present embodiment includes a header, a series of driving event data, driving timing data, and end data. The header includes data representing the song name. The drive event data includes drive on event data and drive off event data. The drive-on event data includes a key code KC that represents the key number of the drive key (the number assigned to the drive key among the numbers assigned to each key) and the drive-on KON that represents the start of driving. The drive-off event data has a key code KC that represents the key number of the key being driven and a drive-off KOF that represents a drive stop. The drive timing data is provided accompanying (adjacent to) each drive event data, and has a tempo clock timing TCLT that represents the drive timing of the drive event data in the music. The end data represents the end of the key driving data.

  In the present embodiment, it is assumed that the key driving data is always stored if the song data is stored (therefore, if a certain song data is stored in the external storage device 9, it corresponds to the song data). The key driving data to be stored is also stored in the external storage device 9 or the external device 100). When a song is selected as described above, not only the song data but also the key driving data is read and the RAM 6 It is taken in. However, the difference between the song data and the key driving data is represented by the generation timing represented by the generation timing data in the song data and the driving timing data in the key driving data corresponding to the generation timing data. Since the drive timing is slightly different (that is, the key drive control takes more time than the sound generation control, it is necessary to make the drive timing earlier than the generation timing). Therefore, only music data is stored in the external storage device 9. The key driving data may be generated from the corresponding music data when the key driving data is required.

  Also, an initial setting process (not shown) is executed in response to an instruction for automatic performance, and an automatic performance table and a key driving table are prepared in the RAM 6. The automatic performance table is a table for performing automatic performance (automatic generation of musical tone signals) based on the song data, and the key driving table is for controlling the driving of the keyboard device 3 based on the key driving data. It is a table. As will be described later, although the automatic performance and the drive control of the keyboard device 3 are executed in parallel, the feature of the present invention is the drive control of the keyboard device 3 and not in the automatic performance. A description of how to perform an automatic performance using the configuration and the automatic performance table will be omitted.

  As shown in FIG. 6, the key driving table has a plurality of channels (10 in this embodiment) ch1 to ch10 for assigning driving on event data in the key driving data. Note that these ten channels are merely examples, and the present invention is not limited thereto, and other numbers may be adopted. Each channel chi (i is an integer from 1 to 10) includes a key code KC (i), a key driving state ST (i), an elapsed time TM (i), an off-delay flag OFDL (i), and an on-delay flag. The ONDL (i), the same key re-keying flag RSK (i), and the first to third switch flags SW1 (i) to SW3 (i) are stored.

  The key code KC (i) is the key code KC in the drive-on event data. The key drive state ST (i) is any one of the first to tenth states ST1 to ST10 according to the drive on timing, that is, the time elapsed from the start of energization control to the actuator 330 (however, the drive on maintenance time is excluded). (See FIG. 17A). The elapsed time TM (i) represents the elapsed time from the drive on timing and the drive off timing. However, the elapsed time TM (i) related to driving off is represented by adding the time from the driving on timing to the driving on sustain start timing to the time from the driving off timing. The off-delay flag OFDL (i) is a flag for delaying the drive-off control with respect to the drive-off immediately after the drive-on with respect to the same key in relation to repeated strikes of the same key. “0” represents non-delay. The on-delay flag ONDL (i) is a flag for delaying the drive-on control with respect to the drive-on immediately after the drive-off with respect to the same key in relation to repeated hits of the same key. “0” represents non-delay. The same key re-keying flag RSK (i) is generated when the driving on-event data of the same key is read after the driving-off event data is read and before the key returns to the initial state. This is a flag indicating the key-on key drive control state. “1” represents the re-key key drive control state, and “0” represents the re-key key drive non-control state. The first to third switch flags SW1 (i) to SW3 (i) represent the on / off states of the first to third switches SW1 to SW3, respectively, “0” represents the off state, and “1”. Represents the ON state.

  In the initial setting of the key driving table, the key code KC (i), the elapsed time TM (i), and the key driving state ST (i) are each reset to “0”. The off-delay flag OFDL (i), the on-delay flag ONDL (i), the same key re-keying flag RSK (i), and the first to third switch flags SW1 (i) to SW3 (i) are reset to “0”, respectively. Is done.

  After the selection and initial setting of the music, the CPU 4 cooperates with the timer 7 every predetermined short time defined by the performance tempo represented by the tempo data included in the header portion of the music data. The automatic performance processing program 7 is repeatedly executed. The predetermined short time is, for example, a time length of about 1/16 or 1/32 of the time length of a quarter note. This performance tempo is also changed by an operation of a tempo operator (not shown) included in the setting operator 1.

  When the execution of the automatic performance processing program is started, the CPU 4 determines whether or not the run flag RUN is “1” in step S1. In the run flag RUN, “1” indicates that the automatic performance is being performed, and “0” indicates that the automatic performance is on standby. Since the run flag RUN is initially set to “0”, the CPU 4 first determines “NO” in step S1, and waits for a start instruction from the user through the determination process in step S2. If the user does not instruct the start of the automatic performance, the CPU 4 determines “NO” in step S2, and temporarily ends the execution of the automatic performance processing program. When the user operates, for example, an automatic performance start switch (not shown) included in the setting operator 1 to instruct the start of automatic performance, the CPU 4 determines “YES” in step S2, and proceeds to step S3. The run flag RUN is set to “1” and the tempo clock TCL is cleared to “0”. Then, the process consisting of steps S5 to S14 is executed.

  As described above, when the run flag RUN is set to “1”, the CPU 4 determines “YES” in step S1 during the subsequent execution of the automatic performance processing program, and sets the tempo clock TCL in step S4. Add “1”. Next, the process after step S5 is demonstrated. In step S5, the CPU 4 determines whether there is event data accompanied by timing data representing the timing indicated by the tempo clock TCL in the music data. If there is no corresponding event data, the CPU 4 determines “NO” in the step S5, and advances the process to a step S9.

  If there is corresponding event data, the CPU 4 determines “YES” in step S5, reads out one corresponding event data in step S6, and executes the automatic performance event processing in step S7. In this automatic performance event processing, if the read event data is key-on event data, the CPU 4 outputs the key code KC and key-on KON in the key-on event data to the sound source 11, and the read event data is If it is key-off event data, the key code KC and key-off KOF in the key-off event data are output to the sound source 11, and if the read-out event data is musical tone control event data, the musical tone parameter in the musical tone control event data is output. Is output to the sound source 11, and if the read event data is tempo event data, the tempo of the automatic performance is changed.

  After the process of step S7, the CPU 4 determines whether or not the corresponding remaining event data is in the song data in step S8, and if there is the corresponding remaining event data, the processes of steps S6 and S7 are performed. Run. The determination process in step S8 is necessary when there are a plurality of event data having the same generation timing in the music data. That is, in step S6, even if there are a plurality of event data having the same occurrence timing, only one of them is read, and the event data is passed to the automatic performance event processing in the next step S7. This is because if there are a plurality, it is necessary to repeat the processes in steps S6 and S7 as many times as the number. In this way, the corresponding event data is processed one by one in the automatic performance event processing in step S7. When there is no corresponding remaining event data, the CPU 4 determines “NO” in step S8, and in step S9, the drive timing representing the drive timing indicated by the tempo clock TCL in the key drive data. It is determined whether there is drive event data accompanied by data. If there is no corresponding drive event data, the CPU 4 determines "NO" in step S9, and once ends this automatic performance processing program.

  If there is corresponding drive event data, the CPU 4 determines “YES” in step S 9, reads one corresponding drive event data in step S 10, and executes a key drive event processing subroutine in step S 11. . After the processing of step S11, the CPU 4 determines whether or not the corresponding remaining driving event data is present in the key driving data in step S12, and if there is the corresponding remaining driving event data, the steps S10 and The process of S11 is executed. The reason for providing the determination process in step S12 is the same as the reason for providing the determination process in step S8. In this way, the corresponding drive event data is processed one by one in the key drive event processing subroutine of step S11. When there is no corresponding remaining drive event data, the CPU 4 determines “NO” in step S12, and determines in step S13 whether or not the reading of the key driving data has reached the end data. Then, until the end data is reached, that is, until the reading of the key driving data for one song is completed, the processes in steps S4 to S13 are repeatedly executed for each short time according to the performance tempo.

  When the reading of the key driving data reaches the end data, the CPU 4 determines “YES” in step S13, sets the run flag RUN to “0” in step S14, and executes the automatic performance processing program. finish. When the run flag RUN is set to “0” in this way, when the automatic performance processing program is executed next, as described above, until the start is instructed by the user by the processing of steps S1 and S2, The process of reading the song data and the key driving data is not executed.

  Note that the reading of the last driving event data in the key driving data (the driving event data immediately before the end data) may end earlier than the reading of the corresponding event data in the music data (as described above). However, in this case, the last event data in the song data cannot be read out in the flowchart of FIG. 7 in this case. . In order to cope with this, the music data reading end flag set to “1” when the reading of the music data reaches the end data and set to “0” otherwise, and the key driving data is read. A key drive data read end flag is set that is set to “1” when the end data is reached, and is set to “0” otherwise. Both the song data read end flag and the key drive data read end flag are set to “ The run flag RUN may be set to “0” when it is set to “1”.

  Next, the key driving event processing subroutine of step S11 will be described. The key drive event processing subroutine is shown in detail in FIG. When the execution is started, the CPU 4 determines in step S21 whether or not the read drive event data is drive-on event data. If it is drive-on event data, the CPU 4 determines “YES” in step S21, and advances the process to step S22. If the read event data is not drive-on event data, the CPU 4 determines “NO” in step S21 and advances the process to step S25. First, the description continues when the read drive event data is drive-on event data. In step S22, the CPU 4 refers to the key driving table and determines whether or not there is a channel that stores the same key code KC as the key code KC included in the read driving on event data. To do. This determination condition is a determination condition related to the same key repetitive strike described later. This basic operation is based on the premise that drive-on event data related to the same key does not occur within a short time in relation to the same key repetitive keystrokes. Therefore, the key code KC included in the read drive-on event data is used. There is no channel that stores the same key code KC. The case where the corresponding channel exists will be described later in detail. Therefore, in this case, the CPU 4 determines “NO” in the step S22, and advances the process to the step S23.

  In step S23, the CPU 4 searches for the channel chi whose first switch flag SW1 is “0” and has the highest allocation priority in the key driving table, and assigns the channel chi to the searched channel chi in FIG. Drive-on event data, which is drive event data read from the key drive data in the process of step S10, is assigned. That is, the key code KC (i) of the found channel chi in the key drive table is set to the key code KC included in the drive-on event data, and the key drive state ST (i) is set to the first state ST1. The elapsed time TM (i) is reset to “0”, the off-delay flag OFDL (i), the on-delay flag ONDL (i), the same key re-keying flag RSK (i), and the first to third switch flags SW1 ( i) to SW3 (i) are set to “0”, respectively. The parentheses in step S23, that is, the same key re-key A flag RSKA (i), the same key re-key B flag RSKB (i), and the same key re-key C flag RSKC (i) are the second in the present invention. This is used in the control device according to the embodiment.

  Next, in step S24, the CPU 4 searches for a duty ratio table (corresponding to “driving signal pattern” in the claims) to which the stored key code KC (i) is assigned in advance. The duty ratio corresponding to the first state ST1 in the duty ratio table is output to the drive control section 3c together with the key code KC (i). Then, the CPU 4 once ends the execution of this key driving event processing subroutine.

  In the present embodiment, the ROM 5 or the external storage device 9 stores a plurality of duty ratio tables storing duty ratios for energization control of the actuator 330. Each of the plurality of duty ratio tables stores the duty ratio when energizing the actuator 330 to smoothly push up the key 310 when the key is pressed as a function of the time from the start of the key pressing, and the key when the key is released In order to smoothly lower 310, the duty ratio at the time of energization control of the actuator 330 is stored as a function of time from the start of key release. In the present embodiment, as shown in FIG. 17 (a), each duty ratio table has five types (ST1 to ST5) of duty ratios that change stepwise as the duty ratio at the time of key depression, for key depression maintenance. 4 types (ST7 to ST10) of duty ratios that change stepwise are prepared as one type (ST6) duty ratio and a duty ratio at the time of key release. In addition, the average values of the duty ratios that change with time stored in the plurality of duty ratio tables are different. In order to displace the key 310 at a uniform speed as much as possible, a sound range to which the key belongs (for example, a low range, a mid-low range, a mid-high range and a high range), a white key or a black key, and an actuator arranged in a staggered manner Depending on the combination of the front and rear positions of 330, the key 310 is assigned in advance to any one of the plurality of duty ratio tables. Specifically, since the mass member 323 of the keyboard device 3 is heavier in the lower sound range (that is, because the rotational moment is larger), the lower sound key 310 is assigned to the duty ratio table having a larger average value. . Since the white key 310W has a larger rotation moment than the black key 310B, the white key 310W is assigned to the duty ratio table having a larger average value than the black key 310B. Since the key 310 in which the actuator 330 is located on the front side has a shorter distance from the hammer body rotation shaft PH than the key 310 in which the actuator 330 is located on the rear side, the duty ratio table having a large average value is used. Assigned.

  When the duty ratio and the key code KC (i) corresponding to the first state ST1 are output to the drive control unit 3c as in step S24, the drive control unit 3c is represented by the key code KC (i). The actuator 330 corresponding to the key 310 is energized with a PWM waveform corresponding to the duty ratio.

  On the other hand, in parallel with the execution of the automatic performance processing program of FIG. 7, the CPU 4 cooperates with the timer 7 to perform the key drive control processing of FIGS. 12 to 15 every predetermined short time (for example, 100 μs). The program is executed repeatedly. When the execution of this key drive control processing program is started, the CPU 4 sets a variable i for sequentially specifying the channels ch1 to ch10 of the key drive table to “1” in step S101, and then step S158 in FIG. The processes of steps S102 to S157 are repeatedly executed until the variable i reaches “10” by the processes of S159 and S159.

  In this case, since all the channels perform a common operation, only one channel i of the key driving table in which the drive-on event data is registered by the process of step S23 in FIG. 8 will be described. In step S102, the CPU 4 determines whether or not the key driving state ST (i) represents the sixth state ST6. In this case, since the key drive state ST (i) is set to the first state ST1 by the process of step S23 of FIG. 8, the CPU 4 determines “NO” in step S102, and then proceeds to step S103. Then, a value representing a predetermined short time value Tc is added to the elapsed time TM (i). This time value Tc is an execution cycle (for example, 100 μs) of the key drive control processing program.

  After the process of step S103, since the key driving state ST (i) is set to the first state ST1, the CPU 4 determines “YES” in step S104, and the elapsed time TM (i) in step S105. ) Is equal to or greater than a predetermined first time value T1 (see FIG. 17A) indicating the end timing of the first state ST1. If the elapsed time TM (i) is not equal to or greater than the first time value T1, the CPU 4 determines “NO” in step S105, and advances the process to step S158 and subsequent steps. Even if the key drive control processing program is executed again, the processes of steps S101 to S105, S158, and S159 are repeated until the elapsed time TM (i) becomes equal to or greater than the first time value T1. During this repetitive process, the drive control unit 3c continues energization control of the actuator 330 represented by the key code KC (i) with the PWM waveform corresponding to the duty ratio supplied by the process of step S24 in FIG.

  On the other hand, when the elapsed time TM (i) becomes equal to or greater than the first time value T1 by the addition processing in step S103, the CPU 4 determines “YES” in step S105, and in step S106, the key driving state ST ( i) is changed to the second state ST2. In step S107, the CPU 4 searches for the duty ratio table to which the key code KC (i) is assigned in advance, and enters the second state ST2 in the searched duty ratio table (see FIG. 17A). The corresponding duty ratio is output to the drive control unit 3c together with the key code KC (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio. After the process of step S107, the CPU 4 advances the process to step S158 and subsequent steps.

  Next, when this key drive control processing program is executed, since the key drive state ST (i) is set to the second state ST2, the CPU 4 makes a determination of “YES” in step S108, and the step Through the processing in steps S109 to S111 similar to S105 to S107, the actuator 330 corresponding to the key 310 represented by the key code KC (i) is associated with the second state ST2 in cooperation with the drive control unit 3c. The energization control is continued until a predetermined second time value T2 indicating the end timing of the second state ST2 with a PWM waveform corresponding to the duty ratio. When the elapsed time TM (i) reaches the second time value T2, energization control of the same actuator 330 as described above starts with a PWM waveform corresponding to the duty ratio corresponding to the third state ST3. Accordingly, the actuator 330 corresponding to the key 310 represented by the key code KC (i) is energized and controlled by the PWM waveform corresponding to the duty ratio corresponding to the second state ST2 for the time T2-T1, and then the third Switching to energization control of the PWM waveform corresponding to the duty ratio corresponding to the state ST3 is performed.

  Next, when this key drive control processing program is executed, since the key drive state ST (i) is set to the third state ST3, the CPU 4 determines “YES” in the step S112, and a step S113. It is determined whether or not the same key re-keying flag RSK (i) is set to “1”. In this basic operation, since the same key re-keying flag RSK (i) is always set to “0”, the CPU 4 determines “NO” in the step S113 and advances the process to a step S114. In step S114, the CPU 4 determines whether an on event of the first switch SW1 has been detected by the scanning unit 3d in FIG. If the ON event of the first switch SW1 is not detected, the CPU 4 determines “NO” in step S114, and advances the process to step S158 and subsequent steps. On the other hand, when the ON event of the first switch SW1 is detected, the CPU 4 determines “YES” in step S114, and sets the first switch flag SW1 (i) to “1” in step S115. In step S116, the CPU 4 changes the key driving state ST (i) to the fourth state ST4. In step S117, the CPU 4 searches for a duty ratio table to which the key code KC (i) is assigned in advance. The duty ratio corresponding to the fourth state ST4 in the found duty ratio table is output to the drive control unit 3c together with the key code KC (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio. After the process of step S117, the CPU 4 advances the process to step S158 and subsequent steps.

  Next, when this key drive control processing program is executed, since the key drive state ST (i) is the fourth state ST4, the CPU 4 determines “YES” in step S119 of FIG. It is determined whether or not the on-event of the third switch SW3 is detected by the scanning unit 3d. If the ON event of the third switch SW3 is not detected, the CPU 4 determines “NO” in the step S120, and advances the process to the step S158 and the subsequent steps. On the other hand, when the ON event of the third switch SW3 is detected, the CPU 4 determines “YES” in step S120, and in step S121, the second and third switch flags SW2 (i) and SW3 (i) are determined. Are respectively set to “1”, and the key driving state ST (i) is changed to the fifth state ST5 in step S122. In step S123, the CPU 4 searches the duty ratio table to which the key code KC (i) is assigned in advance, and sets the duty ratio corresponding to the fifth state ST5 in the searched duty ratio table to the key code KC. Output to the drive control unit 3c together with (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio. Further, in step S124, the CPU 4 sets the added value of the time ΔTst5 (see FIG. 17A) for continuing the fifth state ST5 and the elapsed time TM (i) to the fifth time value T5, and then performs the processing step. Proceed to S158 and thereafter. The fifth time value T5 is set in this way at the time when the fourth state ST4 switches to the fifth state ST5, that is, the fourth time value T4 is not a fixed value, but the on-event occurrence timing of the third switch SW3. This is because it is desired to continue the fifth state ST5 only for a predetermined time, that is, the time ΔTst5 with respect to the fluctuation value.

  Next, a case where the key driving state ST (i) becomes the fifth state ST5 will be described. In this case, unlike the case of the second state ST2, the CPU 4 executes the processes of steps S125 to S133. However, the processes in steps S127 and S130 to S133 are processes when the off-delay flag OFDL (i) is set to “1” in relation to the same key repeated striking. In this basic operation, the off-delay flag OFDL (i) is always set to “0”. Therefore, in this case, the processes of steps S125, S126, S128, and S129 are substantially executed based on the determination of “YES” in step S127. The processes in steps S125, S126, S128, and S129 correspond to the processes in steps S104 to S107 and steps S108 to S111 described above. Accordingly, in this case as well, the actuator 330 corresponding to the key 310 represented by the key code KC (i) corresponds to the fifth state ST5 for the time T5-T4 (= ΔTst5), similarly to the above-described processing. The energization control is performed with the PWM waveform corresponding to the duty ratio, and thereafter the energization control is continued with the PWM waveform corresponding to the duty ratio corresponding to the sixth state ST6.

  By the control of the first to fifth states ST1 to ST5, the key 310 and the hammer body HM are changed from the state of FIG. 3 to the state of FIG. 4, and the rear end portion of the mass member 323 of the hammer body HM is moved by the upper stopper 312. The upward displacement is restricted. This state corresponds to a state in which the user holds down the key 310.

  In this state, when the drive off event data, which is the drive event data, is read out by the process of step S10 in FIG. 7, and the step S11 in FIG. 7, that is, the key drive event process subroutine in FIG. The CPU 4 determines “NO” in step S21 of FIG. 8, determines “YES” in step S25, and executes a key drive off processing subroutine in step S26.

  The key drive off processing subroutine is shown in detail in FIG. When the execution is started, the CPU 4 refers to the key driving table in step S31 and stores the same key code KC as the key code KC included in the read driving off event data. Find a channel chi. Next, it is determined whether or not the key driving state ST (i) in the key driving table designated by the found channel chi is the sixth state ST6. In this case, the found channel chi is assumed to be the same as the channel in which the key driving state ST (i) is set to the sixth state ST6 by the processing of step S101 of FIG. 12 to step S129 of FIG. Proceed with the story. Therefore, the CPU 4 determines “YES” in the step S32, and advances the process to the step S33 and subsequent steps. If “NO” in step S32, that is, if it is determined that the key driving state ST (i) is not the sixth state ST6, this is a case relating to the same key repetitive key stroke that is not this basic operation.

  After determining “YES” in step S32, the CPU 4 changes the key drive state ST (i) to the seventh state ST7 in step S33, and the key code KC (i) is assigned in advance in step S34. A duty ratio table corresponding to the seventh state ST7 in the searched duty ratio table (see FIG. 17A) is output to the drive control unit 3c together with the key code KC (i). Similarly to the above case, the drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio. This control and future control correspond to an operation for returning the key 310 and the hammer body HM in the state of FIG. 4 to the state of FIG. 3, that is, a drive-off operation.

  On the other hand, as described above, the CPU 4 repeatedly executes the key drive control processing program of FIGS. 12 to 15 every predetermined short time value Tc. Since the key drive state ST (i) is set to the seventh state ST7 by the key drive off process subroutine of FIG. 9, the processes of steps S134 to S138 of FIG. 14 are executed. The processing of steps S134 to S138 is the same as the processing of steps S119 to S123 of FIG. 13 described above, and the CPU 4 cooperates with the drive control unit 3c to generate the key 310 represented by the key code KC (i). Until the off-event of the second switch SW2 is detected by the scanning unit 3d with a PWM waveform corresponding to the duty ratio corresponding to the seventh state ST7 (in the processing of steps S119 to S123, The energization control is performed (until an on-event of the third switch SW3 is detected), and thereafter, the control is switched to the energization control of the PWM waveform corresponding to the duty ratio corresponding to the eighth state ST8. Further, steps S139 to S144 in FIG. 14 are the same as the processes in steps S119 to S124 in FIG. 13 described above, and the CPU 4 is represented by the key code KC (i) in cooperation with the drive control unit 3c. The actuator 330 corresponding to the key 310 is energized with a PWM waveform corresponding to the duty ratio corresponding to the eighth state ST8 until the off event of the first switch SW1 is detected by the scanning unit 3d, and then the ninth state While switching to PWM waveform energization control corresponding to the duty ratio corresponding to ST9, the added value of the time ΔTst9 (see FIG. 17A) for continuing the ninth state ST9 and the elapsed time TM (i) is set to the ninth time. The value is T9. Further, the processes in steps S145 to S148 in FIG. 15 are the same as the processes in steps S104 to S107 in FIG. 12 described above, and the CPU 4 uses the key code KC (i) in cooperation with the drive control unit 3c. The actuator 330 corresponding to the represented key 310 is energized and controlled over time ΔTst9 with a PWM waveform corresponding to the duty ratio corresponding to the ninth state ST9, and then PWM corresponding to the duty ratio corresponding to the tenth state ST10. Switch to waveform energization control.

  Next, the case where the key driving state ST (i) becomes the tenth state ST10 will be described. In this case, unlike the case of the ninth state ST9, the CPU 4 executes the processes of steps S149 to S157. However, the processing in steps S151 and S154 to S157 is processing when the on-delay flag ONDL (i) is set to “1” in relation to the same key repetitive keystroke. In this basic operation, the on-delay flag Since ONDL (i) is always set to “0”, the processes of steps S150 to S153 are substantially executed based on the determination of “YES” in step S151. Therefore, when the elapsed time TM (i) becomes equal to or greater than the tenth time value T10, the CPU 4 outputs a duty ratio representing “0” to the drive control unit 3c together with the key code KC (i) in step S152. Therefore, the drive control unit 3c stops the energization control of the actuator 330 corresponding to the key 310 represented by the key code KC (i).

  Under the control of the seventh state ST7 to the tenth state ST10, the key 310 and the hammer body HM are changed from the state shown in FIG. 4 to the state shown in FIG. Due to this, downward displacement is regulated. This state corresponds to the initial state of the key after the user releases the key 310.

  After the process of step S152, the CPU 4 clears the data of the channel chi in the key driving table to the initial value in step S153. This prepares for registration of the next drive-on event data, which is drive event data, in the key drive table.

  In the present embodiment, the event data other than the drive-on event data and the drive-off event data are not read out as the drive event data by the process in step S10 in FIG. When event data other than data is read, the CPU 4 determines “NO” in step S11 of FIG. 7, that is, steps S21 and S25 of the key drive event processing subroutine of FIG. 8, and does nothing. This key drive event processing subroutine is terminated.

  As described above, in this basic operation, steps S23 and S24 in FIG. 8, steps S31 to S34 in FIG. 9, steps S101 to S117 in FIG. 12, steps S119 to S129 in FIG. 13, and steps S134 in FIG. In order to control the key pressing and key release operations of the key 310 by the processing of S144, steps S145 to S153, S158 and S159 of FIG. 15, the actuator 330 responds to the time change of the duty ratio shown in FIG. Be controlled. That is, the energization amount and driving force to the actuator 330 are controlled in proportion to the duty ratio shown in FIG.

  In the change of the duty ratio, at the start of the key pressing operation corresponding to the key pressing of the key 310 and the hammer body HM, the actuator 330 has a medium duty ratio as shown in the first state ST1 in FIG. Thus, energization control, that is, the key 310 and the hammer body HM are driven and controlled with a medium driving force. This is because the driving unit 334 is separated from the base 322 before the key pressing operation is started, and the collision when the upper end of the driving unit 334 contacts the base 322 is reduced. Next, in the second state ST2, the actuator 330 is energized with a large duty ratio, that is, the key 310 and the hammer body HM are controlled with a large driving force. Next, in the third state ST3, the duty ratio is slightly lowered, that is, the driving force of the key 310 and the hammer body HM is slightly lowered.

  After the end of the third state ST3, in the fourth state ST4, the actuator 330 is energized with a medium duty ratio, that is, the key 310 and the hammer body HM are controlled with a medium driving force. As described above, the duty ratio in the fourth state ST4 is set to be smaller than the duty ratio in the third state ST3 because the large driving force in the third state ST3 causes the key 310 and the hammer body HM to move in the key pressing direction. This is because the momentum (inertial force) is applied, so that the driving force is saved to save power. Further, when the upward displacement of the rear end portion of the mass member 323 of the hammer body HM is restricted by colliding with the upper stopper 312, there is also a meaning that the impact noise is reduced by reducing the collision.

  After the end of the fourth state ST4, in the fifth state ST5, the actuator 330 is again energized with a large duty ratio, that is, the key 310 and the hammer body HM are again controlled with a large driving force. This is to prevent the mass member 323 from being displaced downward by the repulsive force of the collision of the rear end portion of the mass member 323 of the hammer body HM with the upper stopper 312, that is, to avoid the rebound of the mass member 323. .

  In the subsequent sixth state ST6, the actuator 330 is energized and controlled with a medium duty ratio, that is, the key 310 and the hammer body HM are driven and controlled with a medium driving force. The sixth state ST6 is a key press maintaining state, that is, a state in which the rear end portion of the mass member 323 of the hammer body HM is kept in contact with the upper stopper 312. This state may continue for a long time, from the viewpoint of power consumption. This is because it is desirable to control the energization of the actuator 330 with a minimum duty ratio that can maintain the key depression state.

  When the key 310 is released, that is, when the hammer body HM is returned to the original position, the first actuator 330 controls the energization with a small duty ratio in the seventh state ST7, that is, the key 310 and the hammer body HM have a small driving force. It is driven and controlled. This is because the mass member 323 of the hammer body HM is suddenly dropped with the release of the key depression. Thereafter, the actuator 330 is energized and controlled with a medium to low duty ratio in the eighth state ST8, that is, the key 310 and the hammer body HM are driven and controlled with a medium driving force. The energization control is performed with the duty ratio gradually increasing from the eighth state ST8 to the tenth state ST10, that is, the key 310 and the hammer body HM are driven and controlled with the driving force gradually increasing gradually. The duty ratio is “0”, that is, the drive control of the key 310 and the hammer body HM ends. The reason for increasing the duty ratio (driving force) in the eighth state ST8 to the tenth state ST10 is that the lower end stopper of the rear end of the mass member 323 is returned when the hammer body HM is returned to the original position when the key is released. This is because the actuator 330 requires a certain amount of thrust in order to mitigate the collision with 313 and prevent the generation of impact sound due to the collision and to avoid rebounding at the rear part. Then, after the rear end of the mass member 323 completely rests on the lower stopper 313, the energization control to the actuator 330 is canceled and the thrust of the actuator 330 is set to “0”. In particular, the closer the key 310 and the hammer body HM are to the original position, that is, the closer the plunger 333 is to the inner bottom surface of the bobbin 331 and the smaller the area facing the solenoid coil 332, the duty ratio (energization amount to the solenoid coil 332). However, the electromagnetic force that pulls up the plunger 333 decreases. In order to correct this decrease in electromagnetic force, it is necessary to increase the duty ratio from the eighth state ST8 to the tenth state ST10.

  By such control from the first state ST1 to the fifth state ST5 in the key pressing operation, control of the sixth state ST6 in the key pressing maintaining operation, and control from the seventh state ST7 to the tenth state ST10 in the key release operation. The key 310 and the hammer body HM can be smoothly displaced while reducing the generation of mechanical noise.

  In addition, a plurality of duty ratio tables are prepared in order to control the duty ratio of the actuator 330 as described above. The plurality of duty ratio tables include the sound range to which the key 310 belongs (for example, a low range, a mid-low range, a mid-high range, and a high range), white keys or black keys, and front and rear of the actuators 330 arranged in a staggered manner. It is prepared according to the combination of positions and is assigned to each key 310 in advance. As a result, the energization control of the actuator 330 is performed using an appropriate duty ratio for each key 310, so that the influence of the variation of each key 310 and each actuator 330 is reduced, and regardless of the structure of the keyboard device 3. Any of the keys 310 and the hammer body HM are appropriately driven.

  Note that this basic operation, that is, the operation for controlling energization of the actuator 330 in accordance with the time change of the duty ratio shown in FIG. 17A is the key drive state ST according to the elapsed time TM from the drive on timing (or drive off timing). The basic operation described in Patent Document 1 is substantially the same in that the corresponding actuator 330 is energized and controlled with a PWM waveform having a duty ratio corresponding to the key drive state ST. However, in the basic operation described in Patent Document 1, the key driving state ST is simply switched according to only the elapsed time TM (that is, key driving control is performed by complete feedforward control). On the other hand, in the basic operation in the present embodiment, a part of the key driving state ST, specifically, switching to the fourth state ST4, the fifth state ST5, the eighth state ST8 and the ninth state ST9 is the first. ~ The third switch SW is performed in accordance with the detection of the on / off event (that is, the key drive control is performed by the feedback control using the key switch SW partially while using the feed forward control as a basis). Is different). Thus, in the electronic piano of the present embodiment, the damper off (release) / release that occurs independently, in part, specifically, without sensing all the steps from key depression to key release. By detecting on (hold) and key on / off, the movement of each key can be simply fed back to control the key press / key release operation. Therefore, it is possible to accurately control the keyboard operation during automatic performance with the simplest possible keyboard and drive device configuration.

(2) Same key repeated operation Next, a plurality of drive on event data and drive off event data having the same key code KC are read from the key drive data within a short time in relation to the same key repeated operation. The case will be described. This is because the drive on event data and the drive off event data representing the extremely fast repetition of the same key are included in the key drive data as drive event data in advance, or the tempo of the automatic performance is operated by operating the tempo operator. Occurs when the speed is increased.

This same key repetitive operation will be described for each repetitive condition. What are the conditions for repeated strikes?
(A) Immediately after the driving on event data is read from the key driving data, driving off event data having the same key code KC as the driving on event data is read from the key driving data ( Hereinafter referred to as “drive off immediately after drive on”)
(B) Immediately after (A) driving off immediately after driving on, driving on event data having the same key code KC as the driving on event data and driving off event data is read from the key driving data. Case (hereinafter referred to as “drive off / on immediately after drive on”)
(C) Immediately after the driving off event data is read from the key driving data, driving on event data having the same key code KC as the driving off event data is read from the key driving data ( Hereinafter referred to as “drive on immediately after drive off”)
(D) (C) Immediately after the drive is turned on immediately after the drive is turned off, the drive off event data and the drive off event data having the same key code KC as the drive on event data are read from the key drive data. Case (hereinafter referred to as “drive on / off immediately after drive off”)
(E) Immediately after (D) driving on / off immediately after driving off, the driving off event data and the driving on event data having the same key code KC as the driving on event data are read from the key driving data. (Hereinafter referred to as “drive on / off / on immediately after drive off”)
It is. In the following, each “same key repeated operation” performed when each of the above-described consecutive hit conditions (A) to (E) is satisfied will be sequentially described.

(A) Drive-off immediately after drive-on This drive-off immediately after drive-on is specifically the case where the key-drive state ST (i) is the sixth after the drive-on event data is read from the key drive data. This is a case where drive off event data having the same key code KC as the drive on event data is read from the key drive data before reaching the state ST6. In this case, in the key drive off processing subroutine of FIG. 9, the CPU 4 determines “YES” in step S35, that is, the key drive state of the channel chi that stores the same key code KC as the key code KC included in the drive off event data. It is determined that ST (i) is one of the first to fifth states ST1 to ST5. In step S36, the CPU 4 sets the off delay flag OFDL (i) of the channel chi to “1”.

  In this state, the elapsed time TM (i) increases due to the execution of the key drive control processing program of FIGS. 12 to 15, and the key drive state ST (i) is the fifth time indicating the end of the fifth state ST5. When the value T5 is reached, the CPU 4 determines “NO” based on the off-delay flag OFDL (i) set to “1” in step S127 after the process of step S126 in FIG. The process of ~ S133 is executed. In step S130, the key driving state ST (i) is set to the seventh state ST7. In step S131, the elapsed time TM (i) is set to a sixth time value T6 (equal to the fifth time value T5) representing the start time of the seventh state ST7 (that is, the end time of the sixth state ST6). In step S132, the duty ratio table to which the key code KC (i) is assigned in advance is searched, and the duty ratio corresponding to the seventh state ST7 in the searched duty ratio table (see FIG. 17A) is obtained. It is output to the drive control unit 3c together with the key code KC (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio. In step S133, the off-delay flag OFDL (i) is reset to “0”.

  By such processing, when drive off event data relating to the same key code KC is read in a state in which the key drive state ST (i) is one of the first state ST1 to the fifth state ST5, the fifth state ST5 Waiting until the end, the key driving state ST (i) is changed to the seventh state ST7 by skipping the sixth state ST6. Therefore, in this case, after the drive-off event data is read, after waiting until the rear end portion of the mass member 323 of the hammer body HM is regulated by the upper stopper 312, the key 310 and the hammer body HM Return control to the original position is started. This ensures that the key 310 is depressed and released, although the timing of generating the tone signal is different. Further, since the key release operation of the key 310 is started within a short time after the musical sound signal is generated, it is not unnatural visually.

(B) Driving off / on immediately after driving on The driving off / on immediately after driving on is specifically the key driving state ST (i after the driving on event data is read out from the key driving data. ) Before reaching the sixth state ST6, the drive-off event data and the drive-on event data having the same key code KC as the drive-on event data are read from the key drive data. In this case, as described in “(A) Drive OFF immediately after drive ON”, when the drive OFF event data is read, the OFF delay flag OFDL (i) is set by the process of step S36 in FIG. Set to “1”. When the drive on event data having the same key code KC as the drive off event data is read, the key 310 and the hammer body HM are in the key depression drive state, and the drive on event data is in the key drive table. There is a channel chi that stores the key code KC. Therefore, the CPU 4 determines “YES” in step S22 of the key drive event processing subroutine of FIG. 8, and determines “YES” in step S27, that is, step S41 of the rekeying processing subroutine of FIGS. It is determined that the key drive state ST (i) of the channel chi storing the key code KC included in the drive-on event data is one of the first state ST1 to the fifth state ST5. Then, the CPU 4 resets the off-delay flag OFDL (i) of the channel chi to “0” by the processing of steps S42 and S43.

  Therefore, in this case, the drive-off event data and the drive-on event data immediately after the drive is turned on are canceled, and the key 310 and the hammer body HM do not perform the key release and key press operations within a short time. This is because even if the key 310 and the hammer body HM are driven in response to the drive-on event data and the drive-off event data related to repeated hits, the drive is delayed, and finally the key 310 and the hammer body HM are pressed. This is because the key state is set, so that it is naturally felt that the key 310 and the hammer body HM are not driven.

(C) Drive-on immediately after drive-off This drive-on immediately after drive-off is specifically, after the drive-on event data is read from the key drive data, the key drive state ST (i) is the 10th. This is a case where drive on event data having the same key code KC as the drive off event data is read from the key drive data before the state ST10 is finished. In this case, the control differs depending on which of the seventh state ST7 to the tenth state ST10 the read timing of the drive on event data belongs to, and these will be sequentially described.

  First, the case where drive-on event data is read from the key drive data in the seventh state ST7 will be described. In this case, in the rekeying subroutine of FIGS. 10 and 11, the CPU 4 determines “NO” in step S41, and sets the same key rekey key RSK (i) to “1” in step S44. To do. Then, the CPU 4 determines “YES” in step S45, that is, the key drive state ST (i) of the channel chi storing the key code KC included in the drive-on event data is the seventh state ST7, and step S46. The subsequent processing is executed. In this case, since the off-delay flag OFDL (i) is set to “0”, the CPU 4 determines “NO” in the step S46, and advances the process to the step S48. In step S48, the CPU 4 sets the key driving state ST (i) to the third R3 state ST3R3 and sets the elapsed time TM (i) at the start of the third R3 state ST3R3 (ie, at the end of the third R2 state ST3R2). The third R2 time value to be represented is set to T3R2. In step S49, the CPU 4 searches for a rekey key duty ratio table to which the key code KC (i) is assigned in advance, and the duty corresponding to the third R3 state ST3R3 in the rekey key duty ratio table thus found. The ratio is output to the drive control unit 3c together with the key code KC (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio.

  FIG. 17B is a diagram illustrating an example of a rekey key duty ratio table corresponding to the duty ratio table (for basic operation) in FIG. As described above, a plurality of duty ratio tables (for basic operation) are provided, and any one of the keys 310 is assigned in advance to each duty ratio table. A plurality of keys 310 are assigned in advance to each rekey key duty ratio table. That is, each re-keying duty ratio table is dedicated to re-keying, provided separately from each (basic operation) duty ratio table, and stored in advance in the ROM 5 or the external storage device 9, for example. Accordingly, FIG. 17A shows an example of a duty ratio table (for basic operation) used when driving control of a certain key 310 with normal keystroke, and FIG. 4 shows an example of a rekey key duty ratio table used when driving control is performed with a rekey key.

  When the key drive control processing program of FIGS. 12 to 15 is executed after the process of step S49 is completed, the key drive state ST (i) is the third R3 state ST3R3, that is, the third state ST3 (part thereof). Therefore, the CPU 4 determines “YES” in step S112 of FIG. 12, and advances the process to step S113. At this time, since the same key re-keying flag RSK (i) is set to “1” in step S44, the CPU 4 determines “YES” in step S113, and re-keying key driving in step S118. A control processing subroutine is executed.

  The rekey key drive control processing subroutine is shown in detail in FIG. When the execution is started, the CPU 4 determines in step S201 whether or not the key driving state ST (i) is in the third R1 state ST3R1, and in step S205, the key driving state ST (i) is in the third R2 state. In step S209, it is determined whether the key driving state ST (i) is the third R3 state ST3R3. In this case, since the key driving state ST (i) is the third R3 state ST3R3, the CPU 4 determines “NO” in step S201, determines “NO” in step S205, and “YES” in step S209. Is determined, and the process proceeds to step S210. The processing of steps S210 to S213 is the same as the processing of steps S114 to S117 of the key drive control processing program of FIG. 12, and the CPU 4 is represented by the key code KC (i) in cooperation with the drive control unit 3c. The on-event of the first switch SW1 with the PWM waveform corresponding to the duty ratio corresponding to the third R3 state ST3R3 in the rekey key duty ratio table (see FIG. 17 (b)). Is controlled until the current is detected by the scanning unit 3d, and then the PWM waveform energization control according to the duty ratio corresponding to the fourth state ST4 in the duty ratio table (for basic operation) (see FIG. 17A). Switch to. In step S214, the CPU 4 resets the same key re-keying flag RSK (i) to “0”.

  By such processing, when the key driving state ST (i) is the seventh state ST7 and the driving on event data relating to the same key code KC is read, the key driving state ST (i) is changed to the third R3 state ST3R3. . Accordingly, in this case, the key 310 and the hammer body HM stop the key release operation and immediately perform the key pressing operation by reading the drive on event data immediately after the read of the drive off event data. As a result, the generation timing of the musical sound signal and the timing at which the key 310 is switched from the key release operation to the key press operation are substantially the same, and it can be felt visually and naturally.

  Next, a case where drive-on event data is read from the key drive data in the eighth state ST8 will be described. In this case, in the rekeying subroutine of FIG. 10 and FIG. 11, the CPU 4 determines “YES” in step S50, that is, the key driving state ST (i of the channel chi storing the key code KC included in the driving on event data. ) Is in the eighth state ST8, and the processes of steps S51 and S52 are executed. In step S51, the CPU 4 sets the key driving state ST (i) to the third R2 state ST3R2, and sets the elapsed time TM (i) to the third R1 time value T3R1 representing the end of the third R1 state ST3R1. In step S52, the CPU 4 searches for a rekeying duty ratio table to which the key code KC included in the drive-on event data is assigned in advance, and the rekeyed duty ratio table (FIG. 17B). The duty ratio corresponding to the third R2 state ST3R2 is output to the drive control unit 3c together with the key code KC (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC with a PWM waveform corresponding to the duty ratio.

  When the key drive control processing program of FIGS. 12 to 15 is executed in this state, the key drive state ST (i) is the third R2 state ST3R2, that is, the third state ST3 (a part thereof). Then, “YES” is determined in step S112 in FIG. 12, and the process proceeds to step S113. At this time, since the same key re-keying flag RSK (i) is set to “1” in step S44, the CPU 4 determines “YES” in step S113, and re-keying key driving in step S118. A control processing subroutine is executed.

  In the rekey key drive control processing subroutine of FIG. 16, the CPU 4 determines “YES” in the step S205, and advances the process to a step S206. In step S206, the CPU 4 determines whether or not the elapsed time TM (i) is equal to or greater than a predetermined third R2 time value T3R2 (see FIG. 17B) indicating the end timing of the third R2 state ST3R2. If the elapsed time TM (i) is not equal to or greater than the third R2 time value T3R2, the CPU 4 determines “NO” in step S206 and ends the rekey key drive control processing subroutine. Even when the key drive control processing program is executed again, the above process is repeated until the elapsed time TM (i) becomes equal to or greater than the third R2 time value T3R2. During this repetitive process, the drive control unit 3c continues energization control of the actuator 330 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio supplied by the process of step S52 of FIG.

  On the other hand, when the elapsed time TM (i) becomes equal to or greater than the third R2 time value T3R2 by the addition process in step S103 of FIG. 12, the CPU 4 determines “YES” in step S206, and performs key drive in step S207. The state ST (i) is changed to the third R3 state ST3R3. In step S208, the CPU 4 searches for a rekey key duty ratio table to which the key code KC (i) is assigned in advance, and finds the rekey key duty ratio table (see FIG. 17B). The duty ratio corresponding to the third R3 state ST3R3 is output to the drive control unit 3c together with the key code KC (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio. After the process of step S208, the CPU 4 ends the rekey key drive control process subroutine.

  Next, when this key drive control processing program is executed, since the key drive state ST (i) is the third R3 state ST3R3, the CPU 4 determines “YES” in the step S209, and the steps S210 to S210. The process of S214 is executed.

  With this process, when the key driving state ST (i) is the eighth state ST8 and the driving on event data relating to the same key code KC is read, the key driving state ST (i) is changed to the third R2 state ST3R2. . Therefore, also in this case, the key 310 and the hammer body HM stop the key release operation and immediately perform the key pressing operation by reading the drive on event data immediately after reading the drive off event data. However, in this case, the second switch SW2 is already in the OFF state, and the key 310 and the hammer body HM enter the key pressing operation after the key releasing operation is completed to some extent. Thereby, although the timing of generating the tone signal is different, the key release operation and the key press operation of the key 310 are surely performed, and it is not unnatural visually.

  Next, a case where drive-on event data is read from the key drive data in the ninth state ST9 will be described. In this case, in the rekeying subroutine of FIG. 10 and FIG. 11, the CPU 4 determines “YES” in step S53, that is, the key driving state ST (i of the channel chi storing the key code KC included in the driving on event data. ) Is in the ninth state ST9, and the processes of steps S54 and S55 similar to the processes of steps S51 and S52 are executed. Thereafter, in the rekey key drive control processing subroutine of FIG. 16, the CPU 4 executes the processes of steps S202 to S204 similar to the processes of steps S206 to S208, and further executes the processes of steps S205 to S214. Thus, the CPU 4 cooperates with the drive control unit 3c to change the actuator 330 corresponding to the key 310 represented by the key code KC (i) to the duty corresponding to the third R1 state ST3R1 in the rekey key duty ratio table. After the energization control is performed until the elapsed time TM (i) reaches the third R1 time value T3R1, the PWM waveform corresponding to the duty ratio corresponding to the third R2 state ST3R2 in the rekey key duty ratio table. In the PWM waveform, the energization control is performed until the elapsed time TM (i) reaches the third R2 time value T3R2, and the duty ratio corresponding to the third R3 state ST3R3 in the rekey key duty ratio table is determined. Switch to energization control of the PWM waveform, and energize with the PWM waveform until the elapsed time TM (i) reaches the third time value T3. To your.

  By such processing, when the key driving state ST (i) is the ninth state ST9 and the driving on event data relating to the same key code KC is read, the key driving state ST (i) is changed to the third R1 state ST3R1. . Therefore, also in this case, the key 310 and the hammer body HM stop the key release operation and immediately perform the key pressing operation by reading the drive on event data immediately after reading the drive off event data. However, in this case, in addition to the second switch SW2, the first switch SW1 is already in the OFF state, and the key 310 and the hammer body HM enter the key pressing operation after the key release operation is further completed to some extent. Thereby, although the timing of generating the tone signal is different, the key release operation and the key press operation of the key 310 are surely performed, and it is not unnatural visually.

  Next, a case where drive-on event data is read from the key drive data in the tenth state ST10 will be described. In this case, in the rekeying subroutine shown in FIGS. 10 and 11, the CPU 4 determines “YES” in step S56, that is, the key driving state ST (i of the channel chi storing the key code KC included in the driving on event data. ) Is in the tenth state ST10, and the processes in and after step S57 are executed. In this case, since the off-delay flag OFDL (i) is set to “0”, the CPU 4 determines “NO” in step S57, and sets the on-delay flag ONDL (i) to “1” in step S59. In step S60, the same key re-key key RSK (i) is reset to “0”. When the elapsed time TM (i) reaches the end of the tenth state ST10, the CPU 4 determines “NO” in step S151 of the key drive control processing program of FIG. 15, that is, the on-delay flag ONDL (i) is “ It determines with it not being 0 ", and the process after step S154 is performed.

  In step S154, the CPU 4 sets the key driving state ST (i) to the second state ST2, and in step S155, sets the elapsed time TM (i) to a time value T1 representing the end of the first state ST1. In step S156, the CPU 4 searches for a duty ratio table to which the key code KC included in the drive-on event data is pre-assigned, and within the searched duty ratio table (see FIG. 17A). The duty ratio corresponding to the second state ST2 is output to the drive control unit 3c together with the key code KC. Further, the CPU 4 resets the on-delay flag ONDL (i) to “0” in step S157. The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC with a PWM waveform corresponding to the duty ratio.

  By such processing, when the key-on state ST (i) is in the tenth state ST10 and the drive-on event data related to the same key code KC is read, the key-driving state ST (i) is finished in the tenth state ST10. After waiting, the key driving state ST (i) is changed to the second state ST2. Therefore, in this case, the key 310 and the hammer body HM are read from the middle of the key drive state ST (i) after the key release operation is completed by reading the drive on event data immediately after the drive off event data is read (the first operation). The key-pressing operation is entered from the second state ST2 (not from the first state ST1). Thereby, although slightly different from the generation timing of the musical tone signal, the key releasing operation and the key pressing operation of the key 310 are surely performed, and it is not unnatural visually.

  As described above, when the drive-on event data is read out immediately after the drive-off event data is read, the key 310 depends on whether the read timing is in the seventh to tenth states ST7 to ST10. In order to drive the hammer body HM, the second state ST2 and the third R1 to third R3 states ST3R1 to ST3R3 are returned to a specific one state. This is because it is necessary to push up the mass member 323 with a larger thrust as the rear part of the mass member 323 of the hammer body HM approaches the lower stopper 313. For this reason, the read timing of the drive-on event data approaches the tenth state ST10. This is because the thrust by the actuator 330 for driving the key 310 and the hammer body HM is increased. Therefore, the key pressing operation of the key 310 and the hammer body HM by the drive on event data immediately after the read of the drive off event data is appropriately performed. For this reason, the duty ratios in the duty ratio table and the rekey key duty ratio table are gradually reduced from the second state ST2 to the third R3 state ST3R3. Further, when returning from any of the seventh to ninth states ST7 to ST9, the keystroke duty ratio table is used instead of the duty ratio table (for basic operation). It can be more stabilized. In the invention described in Patent Document 1, only the duty ratio table (for basic operation) is provided, and the third state ST3 of the duty ratio table is divided into three to be the third to fifth states ST3 to ST5, At the time of re-keying, the seventh to ninth states ST7 to ST9 (in Patent Document 1, the ninth to eleventh states ST9 to ST11) return to a specific one of the third to fifth states ST3 to ST5. In other words, since the third state ST3, which is not required during the basic operation, is divided more finely and prepared for re-keying, the key drive control at the time of normal key pressing (basic operation) is somewhat Had been sacrificed. In the present invention, it is possible to optimize the key drive control at the time of the normal keystroke.

(D) Driving On / Off Immediately after Driving Off This driving on / off immediately after driving off is specifically when the key driving state ST (i) is in any of the seventh to tenth states ST7 to ST10. The drive-on event data is read out from the key drive data, and one of the seventh to tenth states ST7 to ST10 is selected from the second state ST2 and the third R1 to third R3 states ST3R1 to ST3R3. This is a case where the driving off event data is read from the key driving data before switching to the state.

  First, when the key driving state ST (i) is in the seventh state ST7, the driving on event data is read from the key driving data, and immediately after that, the driving off event data is read from the key driving data. The case will be described. In this case, as described in “(C) Driving on immediately after driving off”, the same key re-keying flag RSK (i) is set to “1” by the process of step S44 in FIG. "Is set. In this state, when drive-off event data having the same key code KC as the drive-on event data is read, in the key drive-off process subroutine of FIG. 9, the CPU 4 determines “NO” in step S32. In step S35, “NO” is determined, and this key driving off processing subroutine is terminated. That is, the reading of the drive-off event data is ignored (cancelled). Accordingly, the key drive control process in this case is performed when the “drive on event data for the key drive” is “when the key drive state ST (i) is the seventh state ST7” in “(C) drive on immediately after drive off”. This corresponds to the key drive control process “when read from the data”.

  Next, when the key driving state ST (i) is in any of the eighth to tenth states ST8 to ST10, the driving on event data is read from the key driving data, and immediately after that, the driving off event data is stored. Even when read from the key driving data, the reading of the last driving off event data is ignored, so the key driving control process in this case is the same as that in “(C) Driving on immediately after driving off”. The key drive control process coincides with “when the drive on event data is read from the key drive data when the key drive state ST (i) is any of the eighth to tenth states ST8 to ST10”. To do.

(E) Driving on / off / on immediately after driving off The driving on / off / on immediately after driving off is specifically the key driving state ST (i) in any of the seventh to tenth states ST7 to ST10. Drive on event data and drive off event data are sequentially read out from the key driving data, and the second state ST2 and the third R1 to third R3 states from any of the seventh to tenth states ST7 to ST10. This is a case where drive-on event data is further read from the key drive data before switching to a specific one of ST3R1 to ST3R3.

  First, when the drive on event data and the drive off event data are read out when the key drive state ST (i) is in the seventh state ST7, and the drive on event data is read out immediately thereafter, the above-mentioned “ As described in (D) Driving ON / OFF Immediately after Driving OFF, the same key re-keying flag RSK (i) is set to “1” by the process of step S44 of FIG. When the drive-off event data is read out, nothing is done.

  Thereafter, by reading the drive-on event data, the CPU 4 performs the same process as the process executed at the time of reading the previous drive-on event data in the rekeying subroutine of FIG. That is, each subsequent read of the drive-off event data and drive-on event data is ignored. Accordingly, the key drive control process in this case is performed when the “drive on event data for the key drive” is “when the key drive state ST (i) is the seventh state ST7” in “(C) drive on immediately after drive off”. This corresponds to the key drive control process “when read from the data”.

  Next, when the key drive state ST (i) is in any of the eighth to tenth states ST8 to ST10, the drive on event data and the drive off event data are read, and immediately after that, the drive on event data is read. Even in the case of the output, since the subsequent reading of the drive-off event data and the drive-on event data is ignored, the key drive control process in this case is the “(C) Drive-on immediately after drive-off”. This coincides with the key drive control process of “when the drive on event data is read from the key drive data when the key drive state ST (i) is any of the eighth to tenth states ST8 to ST10”. .

(Second Embodiment)
Hereinafter, an electronic piano to which the control device according to the second embodiment of the present invention is applied will be described.

  The electronic piano of the present embodiment is a part of the control process, specifically, the key driving state ST (i) is in the seventh to ninth states ST7 to ST7 to the electronic piano of the first embodiment. Since only the control process when the drive-on event data is read from the key drive data when in any of ST9 is different, the hardware is different from the electronic piano of the first embodiment. Similar hardware, that is, those shown in FIGS. 1 to 5 will be used as they are.

  The difference between the control process of the present embodiment and the control process of the first embodiment is that, among the repeated hitting conditions (A) to (E) in the first embodiment, “drive on immediately after drive off”. ”Appears in consecutive hit conditions (C) to (E). Then, each “same key continuous hitting operation” performed when the continuous hitting conditions (D) and (E) are satisfied is the same as that when the continuous hitting condition (C) is satisfied as described in the first embodiment. This is almost the same as the “same key repetitive operation” performed, and therefore, the control processing of the present embodiment will be described below by taking only “same key repetitive operation” when the continuous repetitive condition (C) is satisfied as an example. To do.

  First, the case where drive-on event data is read from the key drive data in the seventh state ST7 will be described. In this case, in the rekeying subroutine shown in FIGS. 18 and 19 (in FIG. 18, steps that perform the same processes as those in FIGS. 10 and 11 are given the same step numbers), the CPU 4 In step S41, “NO” is determined, and in step S44, the same key re-keying flag RSK (i) is set to “1”. Then, the CPU 4 determines “YES” in the step S45, and sets the same key re-keying A flag RSKA (i) to “1” in a step S71. Here, the same key re-keying A flag RSKA (i) is read when the key driving state ST (i) is in the seventh state ST7 after the driving off event data is read. This is a flag indicating the state of the rekeying pattern A control that occurs when the key is issued. “1” represents the rekeying pattern A control state, and “0” represents the rekeying pattern A non-control state. Further, after executing the same processing as the processing in steps S46 and S47 in FIG. 10, the CPU 4 advances the processing to step S72. In step S72, the CPU 4 sets the key driving state ST (i) to the third state STA3 and sets the elapsed time TM (i) to the second time value TA2 representing the start time of the third state STA3. In step S73, the CPU 4 searches for the rekey key duty ratio table A to which the key code KC (i) is assigned in advance, and corresponds to the third state STA3 in the rekey key duty ratio table A thus searched. The duty ratio is output to the drive controller 3c together with the key code KC (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio.

  FIG. 24A shows portions corresponding to the third to fifth states ST3 to ST5 in the duty ratio table (for basic operation) described in the first embodiment (see FIG. 17A). FIG. 24B shows an example of the rekey key duty ratio table A corresponding to a part of the (basic operation) duty ratio table. As described in the first embodiment, a plurality of duty ratio tables (for basic operation) are provided, and one of the keys 310 is assigned in advance to each duty ratio table. A plurality of rekey key duty ratio tables A are also provided, and one of the keys 310 is assigned to each rekey key duty ratio table A in advance. That is, each re-keying duty ratio table A is dedicated to re-keying (however, re-keying when the key driving state ST is in the seventh state ST7), and is separate from each (for basic operation) duty ratio table. For example, stored in advance in the ROM 5 or the external storage device 9.

  When the key drive control processing program of FIGS. 12 to 15 is executed after the process of step S73 is completed, the key drive state ST (i) is in the third state STA3, that is, a part of the third state ST3 ( Therefore, the CPU 4 determines “YES” in the step S112 in FIG. 12, and advances the process to a step S113. At this time, since the same key re-keying flag RSK (i) is set to “1” in step S44, the CPU 4 determines “YES” in step S113, and re-keying key driving in step S118. A control processing subroutine is executed.

  The rekey key drive control processing subroutine is shown in detail in FIG. When the execution is started, the CPU 4 determines whether or not the same key re-keying A flag RSKA (i) is set to “1” in step S301, and whether or not the same key re-keying B flag RSKB is determined in step S302. It is determined whether (i) is set to “1”. However, the same key re-key B flag RSKB (i) reads the drive on event data of the same key when the key drive state ST (i) is in the eighth state ST8 after the drive off event data is read. This is a flag indicating the state of the rekeying pattern B control that occurs when the key is pressed. “1” represents the rekeying pattern B control state, and “0” represents the rekeying pattern B non-control state. In this case, since the same key re-keying A flag RSKA (i) is set to “1” in step S71, the CPU 4 determines “YES” in step S301 and re-keys in step S303. The pattern A control processing subroutine is executed.

  The rekeying pattern A control processing subroutine is shown in detail in FIG. When the execution is started, in step S311, the CPU 4 determines whether or not the key driving state ST (i) is the third state STA3. In this case, since the key driving state ST (i) is the third state STA3, the CPU 4 determines “YES” in the step S311, and advances the process to a step S312. The processing of steps S312 to S315 is the same as the processing of steps S114 to S117 of the key drive control processing program of FIG. 12, and the CPU 4 is represented by the key code KC (i) in cooperation with the drive control unit 3c. The actuator 330 corresponding to the key 310 is moved to the third state STA3 in the rekey key duty ratio table A (however, in the processing of steps S114 to S117, the duty ratio table (for basic operation) (see FIG. 24A)). In the PWM waveform corresponding to the duty ratio corresponding to the third state ST3), the energization control is performed until the on-event of the first switch SW1 is detected by the scanning unit 3d. Fourth state STA4 (however, in the processing of steps S114 to S117, the duty ratio table (for basic operation) Le switched to the conduction control of the PWM waveform corresponding to the duty ratio corresponding to (FIG. 24 (a) see) fourth state ST4 in).

  Next, when this key drive control processing program is executed, since the key drive state ST (i) is the fourth state STA4, the CPU 4 determines “NO” in step S311, and “YES” in step S316. Is determined, and the process proceeds to step S317. The processing in steps S317 to S321 is the same as the processing in steps S120 to S124 in FIG. 13, and the CPU 4 corresponds to the key 310 represented by the key code KC (i) in cooperation with the drive control unit 3c. The energized actuator 330 is energized and controlled until the on-event of the third switch SW3 is detected by the scan unit 3d with a PWM waveform corresponding to the duty ratio corresponding to the fourth state STA4 in the rekey key duty ratio table A, Thereafter, switching to energization control of the PWM waveform according to the duty ratio corresponding to the fifth state STA5 in the rekey key duty ratio table A is performed.

  Next, when this key drive control processing program is executed, since the key drive state ST (i) is the fifth state STA5, the CPU 4 determines “NO” in step S311, and “NO” in step S316. "", It is determined "YES" in step S322, and the process proceeds to step S323. The processing of steps S323 to S325 is the same as the processing of steps S126, S128, and S129 of FIG. 13, and the CPU 4 cooperates with the drive control unit 3c to generate the key 310 represented by the key code KC (i). The actuator 330 corresponding to is energized and controlled over time ΔTsta5 with a PWM waveform corresponding to the fifth state STA5 in the rekey key duty ratio table A, and then the duty ratio corresponding to the sixth state ST6 Switch to energization control of PWM waveform according to. Further, in step S326, the CPU 4 resets the same key re-keying A flag RSKA (i) and the same key re-keying flag RSK (i) to “0”.

  With this process, when the key drive state ST (i) is the seventh state ST7 and the drive-on event data related to the same key code KC is read, the rekey key duty ratio table A is referred to, and the third to third The PWM waveform energization control corresponding to the duty ratios corresponding to the five states STA3 to STA5 is executed. As shown in FIG. 24B, the pattern of the keystroke duty ratio table A in the third to fifth states STA3 to STA5 (shown by a solid line in FIG. 24B) and the basic operation duty ratio. Comparing with the pattern of the table (indicated by the alternate long and short dash line in FIG. 5B), the duty ratio corresponding to the third state STA3 is slightly smaller than the duty ratio corresponding to the third state ST3, Moreover, the control time is set considerably short. This is because in the seventh state ST7, since the key 310 and the hammer body HM have just started the key release operation, it is not necessary to push up the mass member 323 of the hammer body HM with a very large thrust. As described above, since the control time in the third state STA3 is considerably shorter than that in the basic operation, the key 310 and the hammer body HM have no momentum (inertial force) in the key-pressing direction. The thrust in the fourth state STA4 is slightly larger than that in the basic operation. Then, with a slightly larger thrust than that during the basic operation, the key 310 and the hammer body HM still do not have so much momentum (inertial force) in the key pressing direction, so that the rear end portion of the mass member 323 of the hammer body HM It is presumed that the rebound generated when colliding with the upper stopper 312 is small, and the thrust in the fifth state STA5 is made slightly smaller than in the basic operation.

  Next, a case where drive-on event data is read from the key drive data in the eighth state ST8 will be described. In this case, in the rekeying subroutine of FIGS. 18 and 19, the CPU 4 determines “YES” in step S50, and executes the processes of steps S74 to S76. The processing of steps S74 to S76 is the same as the processing of S71, S72 and S73, the same key re-key B flag RSKB (i) is set to “1”, and the key driving state ST (i) is set to the third state. After setting to STB3 and setting the elapsed time TM (i) to the second time value TB2 indicating the start time of the third state STB3, the keystroke duty ratio table B to which the key code KC (i) is assigned in advance is set. And the duty ratio corresponding to the third state STB3 in the rekey key duty ratio table B found out is output to the drive control unit 3c together with the key code KC (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio.

  FIG. 24C is a diagram showing an example of a key repetitive duty ratio table B corresponding to a part of the duty ratio table (for basic operation) in FIG. Similar to the duty ratio table (for basic operation) and the rekey key duty ratio table A, a plurality of rekey key duty ratio tables B are also provided, and any key 310 is assigned to each rekey key duty ratio table B in advance. It has been. That is, each re-keying duty ratio table B is dedicated to re-keying (however, re-keying when the key driving state ST is in the eighth state ST8), and each (for basic operation) duty ratio table and re-keying. Provided separately from the duty ratio table A, for example, stored in advance in the ROM 5 or the external storage device 9.

  When the key drive control processing program of FIGS. 12 to 15 is executed after the process of step S76 is completed, a rekey key drive control process subroutine is executed in step S118. In this rekey key drive control processing subroutine, the CPU 4 determines “NO” in step S301, determines “YES” in step S302, and executes the rekey key pattern B control processing subroutine in step S304. Run.

  The rekeying pattern B control processing subroutine is shown in detail in FIG. The main difference between the rekeying pattern B control processing subroutine and the rekeying pattern A control processing subroutine is that the patterns (shapes) of the rekeying duty ratio table to which they refer are different. Specifically, as shown in FIG. 24C, the duty ratio corresponding to the third state STB3 is slightly larger than the duty ratio corresponding to the third state ST3 in the basic operation duty ratio table (for re-keying). The duty ratio is considerably larger than the duty ratio corresponding to the third state STA3 in the duty ratio table A), and the control time is set substantially equal to that during the basic operation (much longer than that in the third state STA3). This is because, in the eighth state ST8, the key 310 and the hammer body HM have momentum (inertial force) in the key release direction compared to the seventh state ST7 (the seventh state ST7 has the key 310 and the hammer. Immediately after the body HM starts the key release operation, the key 310 and the hammer body HM do not have much momentum in the key release direction). In order to instantaneously drive in the reverse direction (key-pressing direction), a slightly larger thrust than the basic operation (a much larger thrust than in the third state STA3) and almost the same as in the basic operation (from the third state STA3) This is because the mass member 323 needs to be pushed up in a considerably long control time. As described above, since the control in the third state STB3 is slightly larger than that in the basic operation and the control is continued for substantially the same time as in the basic operation, the on-event of the first switch SW1 occurs (elapsed time TM (i ) Reaches a third time value TB3), and the thrust becomes slightly larger than in the basic operation. For this reason, the thrust in the fourth state STB4 is made slightly smaller than that in the basic operation. However, in this case, it is estimated that the repulsive force of the collision of the rear end portion of the mass member 323 with the upper stopper 312 is slightly larger than that in the basic operation, and the thrust in the fifth state STB5 is slightly larger than that in the basic operation.

  Next, a case where drive-on event data is read from the key drive data in the ninth state ST9 will be described. In this case, in the rekeying subroutine of FIGS. 18 and 19, the CPU 4 determines “YES” in step S53, and executes the processes of steps S77 to S79. The processing of steps S77 to S79 is the same as the processing of S71, S72 and S73, the same key re-keying C flag RSKC (i) is set to “1”, and the key driving state ST (i) is set to the third state. After setting to STC3 and setting the elapsed time TM (i) to the second time value TC2 indicating the start time of the third state STC3, the keystroke duty ratio table C to which the key code KC (i) is assigned in advance is set. And the duty ratio corresponding to the third state STC3 in the rekey key duty ratio table C searched for is output to the drive control unit 3c together with the key code KC (i). The drive control unit 3c controls energization of the actuator 330 corresponding to the key 310 represented by the key code KC (i) with a PWM waveform corresponding to the duty ratio. The same key re-keying C flag RSKC (i) reads the same key driving on-event data when the key driving state ST (i) is in the ninth state ST9 after the driving off event data is read. It is a flag that indicates the state of the rekeying pattern C control that occurs when the key is issued. “1” indicates the rekeying pattern C control state, and “0” indicates the rekeying pattern C non-control state.

  FIG. 24D is a diagram showing an example of a key repetitive duty ratio table C corresponding to a part of the (for basic operation) duty ratio table in FIG. Similar to the duty ratio table (for basic operation) and the rekey key duty ratio tables A and B, a plurality of rekey key duty ratio tables C are also provided. Already assigned. That is, each re-keying duty ratio table C is dedicated to re-keying (however, re-keying when the key driving state ST is in the ninth state ST9), and each (for basic operation) duty ratio table and re-keying. The duty ratio tables A and B are provided separately and stored in advance in the ROM 5 or the external storage device 9, for example.

  When the key drive control process program of FIGS. 12 to 15 is executed after the process of step S79 is completed, a rekey key drive control process subroutine is executed in step S118. In this rekey key drive control processing subroutine, the CPU 4 determines “NO” in step S301, determines “NO” in step S302, and executes the rekey key pattern C control processing subroutine in step S305. Run.

  The rekeying pattern C control processing subroutine is shown in detail in FIG. The main difference between the rekeying pattern C control processing subroutine, the rekeying pattern A control processing subroutine, and the rekeying pattern B control processing subroutine is that the patterns (shapes) of the rekeying duty ratio table to which they refer are different. It is. Specifically, as shown in FIG. 24D, the duty ratio corresponding to the third state STC3 is considerably larger than the duty ratio corresponding to the third state ST3 in the basic operation duty ratio table (for re-keying). The duty ratio is considerably larger than the duty ratio corresponding to the third state STB3 in the duty ratio table B), and the control time is set to be considerably longer than that in the basic operation (much longer than that in the third state STB3). In the ninth state ST9, compared to the eighth state ST8, the key 310 and the hammer body HM are further provided with momentum (inertial force) in the key release direction. In order to instantaneously drive the attached key 310 and the hammer body HM in the opposite direction (key pressing direction), the thrust is considerably larger than the basic operation (much larger than that in the third state STA3) and considerably longer (the third state STA3). This is because the mass member 323 needs to be pushed up in a control time (which is considerably longer than the time). As described above, since the control in the third state STC3 is considerably larger than that in the basic operation and the control is continued for a considerably longer time than in the basic operation, the ON event of the first switch SW1 occurs (elapsed time TM (i ) When reaching the third time value TC3) is considerably larger than in the basic operation. For this reason, the thrust in the fourth state STC4 is made considerably smaller than in the basic operation. In this case, however, the repulsive force of the collision of the rear end portion of the mass member 323 with the upper stopper 312 is estimated to be considerably larger than that in the basic operation, and the thrust in the fifth state STC5 is considerably larger than that in the basic operation.

  As described above, in the present embodiment, when the drive on event data is read immediately after the drive off event data is read, the read timing is in any of the seventh to ninth states ST7 to ST9. Thus, since the rekey key duty ratio table referred to for driving the key 310 and the hammer body HM is made different, it becomes possible to perform the drive control at the time of key rekeying more finely.

  In the present embodiment, in each control processing subroutine of the rekeying patterns A to C, the switching of the key driving state ST from the third state to the fourth state and the switching from the fourth state to the fifth state are as follows. The third switch SW1 and the third switch SW3 are performed in response to the occurrence of each key-on event. However, the present invention is not limited to this, and a preset (fixed) time value may be used.

  Also, the duty ratios corresponding to the third to fifth key drive states in the rekey key duty ratio tables A, B, and C and the time during which energization control is performed with the duty ratio (the key drive) State holding time) and the magnitude of each duty ratio corresponding to each of the third to fifth key driving states of the basic operation duty ratio table and the time for performing energization control with the duty ratio are as follows: Needless to say, it is not limited to the one shown in FIG.

  A storage medium storing software program codes for realizing the functions of the above-described embodiments is supplied to the system or apparatus, and the computer (or CPU or MPU) of the system or apparatus is stored in the storage medium. It goes without saying that the object of the present invention can also be achieved by reading and executing the program code.

  In this case, the program code itself read from the storage medium realizes the novel function of the present invention, and the program code and the storage medium storing the program code constitute the present invention.

  As a storage medium for supplying the program code, for example, a flexible disk, hard disk, magneto-optical disk, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW, magnetic A tape, a non-volatile memory card, a ROM, or the like can be used. Further, the program code may be supplied from a server computer via a communication network.

  Further, by executing the program code read out by the computer, not only the functions of the above-described embodiments are realized, but the OS running on the computer based on the instruction of the program code is actually used. Needless to say, the present invention includes a case where part or all of the processing is performed and the functions of the above-described embodiments are realized by the processing.

  Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. It goes without saying that the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

3a ... Keyboard, 3b ... Power supply section (key drive means), 3c ... Drive control section (key drive means), 3d ... Scan section (detection means), 4 ... CPU (key drive means, key drive control means, re-keying) Determination means, measurement means, elapsed time determination means), 6 ... RAM (storage means), 7 ... timer (measurement means), 9 ... external storage device (storage means)

Claims (6)

A key-pressing operation for displacing the key from the initial position before pressing the key to the key-pressing position by driving each of the plurality of keys independently or by independently driving a member interlocking with each of the keys; and the key A key driving means for performing a key pressing operation including a key releasing operation for displacing the key from the key pressing position to the initial position,
A key drive control means for controlling a key pressing operation of the corresponding key by supplying a drive signal to the key drive means in accordance with key information representing key depression and key release supplied over time; ,
Storage means for storing a plurality of types of drive signal patterns for the key drive control means to control the key pressing and releasing operation of the corresponding key , wherein the plurality of types of driving signal patterns include the key pressing and releasing operation; A first drive signal pattern defining a drive signal for generating a preset driving force at each stage obtained by dividing the stage into a plurality of stages over time, and the stage of the first drive signal pattern Storage means for storing at least a portion including a second drive signal pattern that defines a drive signal for generating a different driving force in a different division from the first drive signal pattern ;
For each key, each key is determined by determining whether or not key information representing the key depression again is supplied to the key during the key release operation from the start of the key release operation to the end of the key release operation. Re-keying determination means for determining whether or not re-keying is instructed about,
The key drive control means uses the first drive signal pattern when no rekeying instruction is given as a result of the determination by the rekeying determination means, while the second driving signal pattern uses the second driving signal pattern when the rekeying instruction is given. A control device for an automatic performance electronic piano, characterized in that the key-pressing operation of the corresponding key is controlled using the drive signal pattern . Measuring means for measuring an elapsed time from the start of supply of key information representing a key release for each key to the supply of key information representing the next key press of the key;
Whether the elapsed time measured by the measuring means corresponds to one of a plurality of partial sections obtained by dividing a predetermined time from the start of the key release operation of the corresponding key to the end of the key release operation And an elapsed time determining means for determining
When the elapsed time determining means determines that the elapsed time corresponds to one of the plurality of partial sections, the key drive control means outputs a key pressing operation drive signal that differs depending on the corresponding partial section. The control device for an automatic performance electronic piano according to claim 1, wherein the key pressing operation of the corresponding key is controlled. The second driving signal pattern is a driving signal pattern press key operation, is constituted by a plurality of drive signals changes so as to generate a driving force which varies stepwise in the key depression operation region,
When the elapsed time determination means determines that the elapsed time corresponds to one of the plurality of partial sections, the key drive control means is configured to output the corresponding partial section in the key pressing operation drive signal pattern. 3. The control device for an automatic musical performance electronic piano according to claim 2, wherein a key pressing operation of the corresponding key is controlled using drive signals at different stages according to the control signal. Said second drive signal pattern may be a plurality of drive signal pattern for the key depression operation in accordance with the number of prior SL subintervals, it is constituted by what each independent,
When the elapsed time determination means determines that the elapsed time corresponds to one of the plurality of partial sections, the key drive control means determines that the corresponding portion from the plurality of key pressing operation drive signal patterns. 3. The automatic operation according to claim 2, wherein any one is selected in accordance with a section, and the key pressing operation of the corresponding key is controlled using the selected key pressing operation signal pattern. Control device for playing electronic piano. A detection unit that outputs a corresponding detection signal to detect that the key pressing position has reached one of a plurality of predetermined positions due to the displacement of the key in accordance with the key release operation;
The key drive control means switches the stage in the selected drive signal pattern according to the detection signal output from the detection means, and supplies the drive signal corresponding to the switched stage to the key drive means. The control device for an automatic performance electronic piano according to claim 1, wherein the key pressing operation of the corresponding key is controlled.   A key-pressing operation for displacing the key from the initial position before pressing the key to the key-pressing position by driving each of the plurality of keys independently or by independently driving a member interlocking with each of the keys; and the key A plurality of types of drive signal patterns for controlling the key pressing and releasing operation of the key, and a key driving means for performing the key pressing and releasing operation including a key releasing operation for displacing the key from the key pressing position to the initial position. Storage means for storing, wherein the plurality of types of driving signal patterns generate a driving force set in advance in each stage obtained by dividing the key release key operation into a plurality of stages over time. A first driving signal pattern that defines a driving signal and at least a part of the first stage of the first driving signal pattern are generated in different divisions and different driving forces from the first driving signal pattern. A second program for executing the control method on a computer for controlling the automatic playing electronic piano and a storage means for storing intended to include the drive signal pattern defining a driving signal that,
  The control method is:
  A key driving control step for controlling a key pressing operation of the corresponding key by supplying a driving signal to the key driving means in accordance with key information representing key pressing and key release supplied over time; ,
  For each key, each key is determined by determining whether or not key information representing the key depression again is supplied to the key during the key release operation from the start of the key release operation to the end of the key release operation. A rekeying determination step for determining whether rekeying is instructed for
Have
  The key drive control step uses the first drive signal pattern when no rekeying instruction is given as a result of the determination by the rekeying determination step, while the second driving key pattern uses the second driving signal pattern. Controls the key press / release operation of the corresponding key using the drive signal pattern
A program characterized by that.

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