JP4159715B2 - Keyboard device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a keyboard device, and more specifically, an electronic piano that causes a keyboard to perform a key press operation / key release operation according to performance data indicating a sound generation start instruction (key press instruction) / sound generation stop instruction (key release instruction). It is related with a keyboard apparatus.
[0002]
[Prior art]
In general, in the field of electronic musical instruments, an automatic performance device is mounted, and performance data (for example, in MIDI, which indicates a sound generation start instruction (key press instruction) / a sound generation stop instruction (key release instruction) read by the automatic performance apparatus) (Performance data indicating a sounding start instruction (key press instruction) corresponds to note-on, and performance data indicating a sound generation stop instruction (key release instruction) corresponds to note-off). An electronic musical instrument such as an electronic piano that performs a key release operation is known.
[0003]
Such a keyboard device for an electronic musical instrument such as an electronic piano has a plurality of oscillating keys operated by a performer and a solenoid arranged for each of the plurality of keys. A solenoid is driven in accordance with performance data from a device or the like, and a key is pressed / released.
[0004]
Specifically, the solenoid corresponding to the key indicated by the key number of the sound generation start instruction (key press instruction) of the performance data output from the automatic performance device or the like is energized, and the sound generation start instruction (key press instruction) The key indicated by the key number is depressed to enter the depressed state, and the performance data output from the automatic performance device is output to the solenoid corresponding to the key indicated by the key number of the sound generation stop instruction (key release instruction). The energization is terminated, and the key indicated by the key number of the sound generation stop instruction (key release instruction) is released to enter the key release state.
[0005]
Therefore, when sufficient power is not supplied to the solenoid, there is a possibility that an overload condition occurs and the key pressing operation by the solenoid is not performed, and the key pressing operation according to the performance data may not be realized.
[0006]
However, in the above-described electronic musical instrument keyboard device, a large-capacity power source is necessary to ensure a sufficient power source capacity. However, such a large-capacity power source is expensive, and the capacity If a large power source is arranged in the keyboard device of the electronic musical instrument, there is a problem that the manufacturing cost increases and the cost becomes high.
[0007]
Also, if a predetermined solenoid is energized for a long time according to the performance data and the key disposed on the solenoid is depressed for a long time, the solenoid may be overheated and burned out. There is.
[0008]
Therefore, in order to avoid energizing a predetermined solenoid for a long time, the time during which the key is in the depressed state (in this specification, the “time during which the key is depressed” is referred to as “ The key pressing time is appropriately referred to as “key pressing time”), and control is performed so that the key pressing time does not exceed a predetermined time.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the various problems of the prior art as described above, and the object of the present invention is to limit the number of keys that can be simultaneously depressed so that the consumption is reduced. It is an object of the present invention to provide a keyboard device in which the current does not exceed the maximum rating of the power supply.
[0010]
It is another object of the present invention to provide a keyboard device that limits the key pressing time so that the current consumption does not exceed the maximum rating of the power supply.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention provides:In a keyboard device that performs a key press operation in response to a performance data sounding start instruction and also releases a key in response to a performance data sounding stop instruction, the time from the performance data sounding start instruction to the sounding stop instruction is set. Detecting means for detecting, comparing means for comparing a time from a sounding start instruction to a sounding stop instruction detected by the detecting means with a predetermined time, and a sounding start in which the comparison result of the comparing means is detected by the detecting means Control means for matching the time from the sound generation start instruction detected by the detection means to the sound generation stop instruction to the predetermined time when the time from the instruction to the sound generation stop instruction is longer than the predetermined time; It is made to have.
[0015]
Therefore, according to the invention described in claim 1 of the present invention,Since the key pressing time can be limited, it is possible to prevent the current consumption from exceeding the maximum rating of the power supply.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of a keyboard device according to the present invention will be described in detail with reference to the accompanying drawings.
[0017]
FIG. 1 shows a block diagram of an electronic musical instrument provided with an example of an embodiment of a keyboard apparatus according to the present invention. The electronic musical instrument controls the overall operation of the electronic musical instrument. It is comprised so that it may control using.
[0018]
The CPU 10 includes a read only memory (ROM) 14 in which a program for controlling the operation of the CPU 10 is stored via the bus 12 and various register groups and flags necessary for the CPU 10 to execute the program. Is set based on a random access memory (RAM) 16, an automatic performance device (sequencer) 18 for storing performance data and outputting the performance data stored via the bus 12, and performance data from the sequencer 18. A sound source 20 for generating a musical tone signal, a solenoid drive control unit 24 for inputting performance data, generating a drive signal corresponding to the performance data, and outputting it to a solenoid 32 of a keyboard device 26 described later, and a player A plurality of swingable keys 30 and solenoids 32 disposed on each of the keys 30 A keyboard device 26 having a key mechanism for operating the key 30, and a timer 34 for issuing a timer interrupt to the CPU 10 at a predetermined time interval when counting the elapsed time since the keyboard device 26 is powered on. Is connected.
[0019]
The sound source 20 is connected to a sound system 22 that is composed of an amplifier, a speaker, and the like, and emits the sound signal generated by the sound source 20 into the space as a sound that can be heard.
[0020]
Reference numeral 28 denotes a MIDI interface (MIDI I / F) to which an external MIDI device 100 such as an automatic performance device (sequencer) is connected, and performance data generated by the external MIDI device 100 is input. It performs control such as outputting performance data to an external MIDI device 100.
[0021]
Here, in the description of this embodiment, in order to simplify the description and facilitate understanding of the present invention, the performance data stored in advance by the sequencer 18 is used as performance data to be processed. However, the present invention is not limited to this, and the performance data stored in the external storage means may be read out.
[0022]
In addition, this electronic musical instrument is provided with various control elements (not shown). By operating appropriate control elements, performance data output from the sequencer 18 or performance data input from the MIDI interface 28 is obtained. It is assumed that it can be arbitrarily selected.
[0023]
In the following, the components related to the implementation of the present invention will be described as appropriate.
[0024]
First, the sequencer 18 outputs performance data as described above. The performance data output from the sequencer 18 includes performance data in the first format shown in FIG. 2A and FIG. The performance data in the second format shown in FIG.
[0025]
The performance data in the first format includes key number data (Key Number: key number) indicating a key to be pressed, sounding start instruction data (NoteOn: note on) indicating a key pressing instruction, and a key being pressed. The key press speed data (Velocity) indicating the speed to be played, and the key press time data (Gate Time) indicating the time during which the key is in the key press state, that is, the time during sound generation. is there. In the performance data in the first format, when the time indicated by the key pressing time data (gate time) elapses from the start of sound generation, sound generation stop instruction data (Note Off: note-off) is output. .
[0026]
In the electronic musical instrument, the performance data in the first format (see FIG. 2 (a)) is pronounced corresponding to the sounding start instruction data (note on) and time information (Time) and the sounding start instruction data. It is converted into performance data (see FIG. 2B) of the second format configured by a combination of stop instruction data (Note Off: note-off) and time information (Time).
[0027]
The process of converting the performance data in the first format to generate the performance data in the second format is a conventionally known process, and therefore detailed description thereof will be omitted.
[0028]
The solenoid drive control unit 24 generates a drive signal in accordance with the sound generation start instruction data (note-on), and the generated drive signal is a key indicated by the key number of the sound generation start instruction data (note-on). The power is output to the solenoid 32 arranged at 30.
[0029]
The solenoid drive control unit 24 stops the generation of the drive signal in accordance with the sound generation stop instruction data (note-off).
[0030]
When the drive signal from the solenoid drive control unit 24 is output and power is supplied to the solenoid 32, the key 30 is depressed, and the output of the drive signal from the solenoid drive control unit 24 is stopped. When the supply of power is stopped, the key 30 is brought into a key release state.
[0031]
The timer 34 counts the elapsed time since the power of the electronic musical instrument is turned on as described above, and interrupts the CPU 10 at a predetermined time interval, and the CPU 10 is interrupted at the predetermined time interval. On the other hand, when a timer interrupt is applied, a periodic service processing routine (FIG. 5) described later is executed.
[0032]
Next, as shown in FIG. 3, a table for reserving sound generation stop instruction data (note-off) is set in the RAM 14, and this table stores a key number column for storing key numbers. And a “remaining waiting time” field for storing the remaining waiting time of the key number stored in the “key number”.
[0033]
In the “key number” field, when the sequencer 18 outputs the sound generation start instruction data (note-on) of the performance data in the first format, the key number of the sound generation start instruction data (note-on) is stored. It is what is done.
[0034]
On the other hand, the key remaining time (gate time) stored in the “key number” is stored in the “remaining waiting time” column, and a timer interrupt is applied to the CPU 10 by the timer 34. When a routine service processing routine (FIG. 5) described later is executed, a difference obtained by subtracting the elapsed time from the key pressing time data (gate time), that is, until the sound generation stop instruction data (note off) is output. The remaining waiting time is stored.
[0035]
If the remaining waiting time until the sounding stop instruction data (note off) stored in the “Remaining wait time” column is negative, the reserved time of the sounding stop instruction data (note off) has passed. Therefore, the “remaining waiting time” field and the corresponding “key number” field are opened by the processing of the periodic service processing routine described later.
[0036]
Note that “−1” is stored in the opened “key number” field (see FIG. 3), and “−1” is stored in the “key number” field. Only in the column and the “remaining waiting time” column corresponding to the “key number”, the key number and the remaining waiting time can be newly stored.
[0037]
In the table for reserving the sound generation stop instruction data (note-off), the number of keys that can be simultaneously depressed in the electronic musical instrument, that is, the number equal to the maximum number n of key depressions. A “key number” field and a “remaining waiting time” field are set. Note that the maximum number n of keys pressed is smaller than the number of simultaneous sounds of the sound source 20.
[0038]
In FIG. 3, the sequencer 18 outputs key number 64, key number 66, and sound start instruction data (note-on) of the first number of performance data in the first format. "64" indicating the key number 64 is stored in the "" column, and the remaining until the sound generation stop instruction data (note off) of the key number 64 is stored in the "remaining waiting time" column corresponding to the "key number". Is stored in the “key number” column, “66” indicating the key number 66 is stored in the “remaining waiting time” column corresponding to the “key number”. 1500 msec which is the remaining waiting time until the sound generation stop instruction data (note-off) of number 66 is stored, and “68” indicating the key number 68 in the “key number” column. Is stored, and 1950 msec which is the remaining waiting time until the sound stop instruction data (note-off) of the key number 68 is stored in the “remaining waiting time” column corresponding to the “key number”. It is shown.
[0039]
Hereinafter, the operation of an electronic musical instrument provided with an example of an embodiment of a keyboard apparatus according to the present invention will be described with reference to the flowcharts shown in FIGS.
[0040]
First, the processing routine activated by the note event from the sequencer 18 shown in the flowchart of FIG. 4 will be described. The processing routine activated by the note event from the sequencer 18 is connected to the electronic musical instrument from the sequencer 18. This is an interrupt routine that is activated when an event, that is, performance data in the first format is output.
[0041]
Note that both the processing routine (see FIG. 4) activated by the note event from the sequencer 18 and the periodic service processing routine (see FIG. 5) to be described later are performed from the first format performance data to the second format performance data. It is executed in the mechanism that performs the conversion process.
[0042]
In the processing routine activated by the note event from the sequencer 18, the performance data in the first format is output from the sequencer 18, and a table for reserving sound generation stop instruction data (note off) (see FIG. 3). If there is no “key number” field and “remaining waiting time” field that are open, the process of releasing the lowest-priority “key number” field and “remaining waiting time” field In addition, a process of limiting the key pressing time data (gate time) stored in the “remaining waiting time” column to be shorter than a predetermined time is performed, and the “key number” column and the “key” The process of storing the key number of the performance data and the remaining waiting time in the “remaining waiting time” corresponding to “number” is performed.
[0043]
When the processing routine started by the note event from the sequencer 18 is started, first, in the processing of step S402, the sound generation start instruction data (note on) of the first format performance data output from the sequencer 18 is started. Is output to the solenoid drive control unit 24.
[0044]
Then, the solenoid drive control unit 24 generates a drive signal in accordance with the output sounding start instruction data (note-on), and the generated drive signal is the key of the sounding start instruction data (note-on). The power is supplied to the solenoid 32 arranged on the key 30 indicated by the number, and the solenoid 32 is supplied with power, and the key 30 enters the key depression state.
[0045]
In step S404 following step S402, the “key number” field and the “remaining waiting time” field that are opened in the table (see FIG. 3) for reserving sound generation stop instruction data (note-off) are displayed. Detecting free memory detected by
[0046]
Specifically, it is determined whether or not “−1” is stored in each of the set “key number” fields equal to the maximum number n of key presses. When “−1” is stored, the “key number” is released, and when “−1” is not stored in the “key number” field, the “key number” is released. Is not.
[0047]
When step S404 ends, the process proceeds to step S406, where the “key number” field and “remaining waiting time” in the table (see FIG. 3) for reserving the sound generation stop instruction data (note-off) in step S404 are reserved. As a result of the detection processing in the "" column, it is determined whether or not detection is performed in the "key number" field that is released and the "remaining waiting time" field. If it is determined that the column and the “remaining waiting time” column have been detected, the process proceeds to step S414, and detection of the opened “key number” column and the “remaining waiting time” column is performed. If it is determined not to be performed, the process proceeds to step S408.
[0048]
If it is determined in step S406 that the open “key number” field and the “remaining waiting time” field have been detected, the pronunciation stop instruction data (note-off) is reserved. In the table (see FIG. 3), the key number of the performance data and the remaining waiting time are not stored in all of the “key number” column and the “remaining waiting time” column. A table for reserving sound generation stop instruction data (note-off) when it is determined that the “key number” field and the “remaining waiting time” field that have been released are not detected in S406 In the “key number” column and the “remaining waiting time” column, the number of performance data key numbers and the remaining waiting time are stored in a number equal to the maximum number n of key presses (see FIG. 3). It is what.
[0049]
In step S408, the “key number” column and the “remaining waiting time” column having the lowest priority are detected.
[0050]
In this embodiment, the remaining time until the sound generation stop instruction data (note-off) stored in the “remaining wait time” column is the minimum value in the “key number” column and “remaining wait time”. The “time” field is set to be the “key number” field and the “remaining waiting time” field having the lowest priority.
[0051]
Accordingly, in step S408, from among the remaining waiting times up to n sounding stop instruction data (note-off) stored in all of the “remaining waiting time” fields equal to the maximum number of key depressions n. The minimum value is detected, and the “key number” field and the “remaining waiting time” field in which the minimum value is stored are used as the “key number” field and the “remaining waiting time” field with the lowest priority. Detect and proceed to step S410.
[0052]
In step S410, sound generation stop instruction data (note-off) is output to the solenoid drive control unit 24 for the key number stored in the “key number” field having the lowest priority detected by the process of step S408. To do. As a result, the generation of the drive signal in the solenoid drive control unit 24 is stopped, the supply of power to the solenoid 32 is stopped, and the key 30 is released.
[0053]
When step S410 is completed, the process proceeds to step S412, and the sound generation stop instruction data (note off) stored in the “key number” column and the “remaining waiting time” column with the lowest priority detected by the process of step S408 are stored. ) Has already been performed in advance of the original timing by the process of step S410, so that the “key number” column having the lowest priority detected by the process of step S408 and the “remaining waiting time” The field is released and the process proceeds to step S414.
[0054]
In step S414, a comparison process is performed between the predetermined time and the key pressing time indicated by the key pressing time data (gate time) of the first format performance data input from the sequencer 18 in step S402. If the key pressing time indicated by the key pressing time data (gate time) is longer than that, the process proceeds to step S416, and if the key pressing time indicated by the key pressing time data (gate time) is shorter than the predetermined time. Advances to step S418.
[0055]
The predetermined time in step S414 is to prevent the solenoid 32 from overheating and burning when the key 30 provided with the solenoid 32 is depressed for a long time. It is a preset time as much as possible.
[0056]
In step S416, the key pressing time indicated by the key pressing time data (gate time) of the performance data of the first format input from the sequencer 18 in step S402 is changed to a predetermined time, and the process proceeds to step S418.
[0057]
In step S418, the “key number” field opened in the table (see FIG. 3) for reserving the sound generation stop instruction data (note-off) is input to the first input from the sequencer 18 in step S402. The key number data (key number) of the performance data in one format is stored, and the first format input from the sequencer 18 in step S402 in the “remaining waiting time” column corresponding to the “key number” column. Stores key press time data (gate time) of performance data.
[0058]
At this time, the key pressing time indicated by the key pressing time data (gate time) stored in the “remaining waiting time” column is set to a predetermined time or less by the processing of steps S414 to S416.
[0059]
When the processing in step S418 is completed, the processing routine activated by this note event is terminated.
[0060]
Next, the periodic service processing routine shown in FIG. 5 will be described. This periodic service processing routine is read and activated every time the CPU 10 inputs an interrupt signal output from the timer 34 at a predetermined time interval. It is. That is, the regular service processing routine is periodically started at a predetermined time interval.
[0061]
When this periodic service processing routine is started, first, in step S502, it is stored in the “remaining waiting time” column of the table (see FIG. 3) for reserving sound generation stop instruction data (note-off). The difference obtained by subtracting the elapsed time counted by the timer 34 from the remaining waiting time until the sound generation stop instruction data (note off) is set as the remaining waiting time until the new sound generation stop instruction data (note off). Store in the “Remaining wait time” column.
[0062]
When step S502 ends, the process proceeds to step S504, and when the remaining waiting time until the sounding stop instruction data (note-off) stored in the “remaining waiting time” is negative, the sounding stop instruction data (note-off) Since the reserved time has passed, the sound generation stop instruction data (note off) is solenoid driven for the key number stored in the “key number” field corresponding to the “remaining waiting time” field. Output to the control unit 24.
[0063]
As a result, the generation of the drive signal in the solenoid drive control unit 24 is stopped, the supply of power to the solenoid 32 is stopped, and the key 30 is released. On the other hand, the “remaining waiting time” column and the “key number” column corresponding to the table (see FIG. 3) for reserving the pronunciation stop instruction data (note off) are opened, and the released “ “−1” is stored in the “key number” field.
[0064]
When the process of step S504 is completed, the regular service process routine is terminated.
[0065]
As described above, in the electronic musical instrument according to the present invention, the tone generator 20 generates a musical tone signal according to the performance data from the sequencer 18, and the number of keys that are simultaneously depressed according to the performance data is maximum. The number of key presses is limited to n or less, and the key press time of the key 30 is limited to be shorter than a predetermined time, so that the current consumption does not exceed the maximum rating of the power source and an overload state is avoided. As a result, the key 30 can be depressed by the solenoid 32, and the key 30 provided with the solenoid 32 is depressed for a long time, and the solenoid 32 is overheated and burned. Can be avoided.
[0066]
In addition, since the sounding start instruction data (note on) and sounding stop instruction data (note off) output from the sequencer 18 are directly supplied to the sound source 20, the number of key presses is the maximum number of key presses. Even if there is a key that is forcibly released beyond n, the tone generator 20 generates a tone signal according to the performance data.
[0067]
In addition, since a necessary power source capacity is reduced and a power source having a large capacity is not used, the manufacturing cost and the like can be reduced and the cost can be reduced.
[0068]
In this electronic musical instrument, as described above, the solenoid drive control unit 24 generates a drive signal in accordance with the sound generation start instruction data (note-on) of the performance data in the first format output from the sequencer 18. The drive signal is output to the solenoid 32 disposed on the key 30 indicated by the key number of the sound generation start instruction data (note-on). The drive signal is shown in FIGS. It has two types of waveforms as shown in FIG.
[0069]
More specifically, a drive signal having an initial drive waveform (see ch2 in FIG. 6A) is output from the solenoid drive control unit 24 for 170 msec after the output of the drive signal to the solenoid 32 is started, and the initial drive is performed. A large amount of electric power corresponding to the waveform is supplied to the solenoid 32 to obtain a large initial driving force.
[0070]
Then, after 170 msec after the output of the drive signal to the solenoid 32 is started, the drive signal of the holding waveform (see ch1 in FIG. 6A) is output from the solenoid drive control unit 24, and the electric power corresponding to the holding waveform is generated. It is supplied to the solenoid 32 to obtain a holding force.
[0071]
Here, as shown in FIG. 7, the initial drive waveform or the holding waveform described above is output to the output port 40 arranged in a number equal to the maximum number of key depressions n, and the electronic switch 42 supplies power to the solenoid 32. The interface circuit 44 converts the voltage applied to the solenoid 32 to a logic voltage level, and the OR operation of the output of the interface circuit 44 is performed by the OR circuit 46 to generate an output signal. .
[0072]
Accordingly, the level of the output port 40 at the phase 0 is the LOW level regardless of whether it is the initial drive waveform or the hold waveform (see FIG. 6A), and at this timing, the logical sum that is the feedback signal from the solenoid 32 is obtained. The logic of the output signal generated by the circuit 46 can be verified to detect a failure of the electronic switch 42.
[0073]
For this reason, even when the electronic switch 42 fails in the conductive state, it is possible to prevent the solenoid 32 from being destroyed because the key 30 remains pressed and overheated.
[0074]
In the embodiment according to the present invention described above, the “key number” column in which the remaining waiting time until the sound generation stop instruction data (note-off) stored in the “remaining waiting time” column is the minimum value. And the “Remaining wait time” field are the lowest-priority “Key number” field and “Remaining wait time” field, but it is of course not limited to this, The memory with the lowest priority is, for example, the “key number” column and the “remaining remaining time” maximum value of the remaining waiting time until the sound generation stop instruction data (note-off) stored in the “remaining waiting time” column. "Waiting time" column, maximum or minimum key pressing speed data (velocity), oldest pronunciation start instruction data (note-on), or newest pronunciation start instruction Data (note on) May be, may be as the highest level or the lowest level of the output level of the current sounding may be best pitch or minimum pitch.
[0075]
At this time, according to the contents of the above priority order, in the process of step S418, the “key number” column and “waiting for remaining” in the table (see FIG. 3) for reserving the sound generation stop instruction data (note-off) Corresponding to the “Time” field, key pressing speed data (velocity), a serial number indicating the stored order, and the like are stored.
[0076]
In the above-described embodiment according to the present invention, the key pressing time data (gate) stored in the “remaining waiting time” column of the table (see FIG. 3) for reserving the sound generation stop instruction data (note-off) (Time) may be converted into the number of ticks used in the sequencer 18 and stored.
[0077]
The conversion to the number of ticks (Wait Tick) is performed by the key pressing time (Wait Sec) indicated by the key pressing time data (gate time), the tempo (Tempo: the number of quarter notes going to one minute), and TPQN (quarter The number of ticks per note) can be used to calculate “Wai Tick = Wai Sec / (60 / (Tempo × TPQN))”.
[0078]
In this way, when the key pressing time data (gate time) converted into the number of ticks is stored in the “remaining waiting time” column, when the timer event occurs at the timing of the ticks, usually the performance data is also stored. Since time is indicated in units of Tick, the amount of calculation is reduced, and the load on the CPU 10 can be reduced.
[0079]
In the embodiment according to the present invention described above, when the sound generation stop instruction data (note-off) is output to the solenoid drive control unit 24, the generation of the drive signal in the solenoid drive control unit 24 is stopped, and the solenoid The power supply to the power supply 32 is stopped. However, the present invention is not limited to this, and a truncation request is output to the solenoid drive control unit 24 instead of the sound generation stop instruction data (note-off). Thus, the power supply to the solenoid 32 is not immediately stopped after the output of the sound generation stop instruction data (note-off), but, for example, the key 30 is lowered to the lowest position to enter the key depression state. The supply of power to the solenoid 32 may be stopped after waiting.
[0080]
That is, when the truncation request is output to the solenoid drive control unit 24, the “key number” column and the “remaining waiting time” in the table (see FIG. 3) for reserving the sound generation stop instruction data (note off) are reserved. The supply of power to the solenoid 32 can be stopped at a later timing than the timing of opening with the column.
[0081]
In the embodiment according to the present invention described above, the electronic musical instrument provided with the keyboard device has the sequencer 18 incorporated therein, but the electronic musical instrument without the sequencer incorporated also in the keyboard according to the present invention described above. Implementation of the device is possible.
[0082]
In this case, sound generation start instruction data (note on) and sound generation stop instruction data (note off) may be input from a MIDI device connected to the outside via the MIDI interface 28. .
[0083]
Further, in the above-described embodiment of the present invention, the electronic musical instrument provided with the keyboard device is integrated with the electronic musical instrument incorporating the sound source 20, but as a simple keyboard device not incorporating the sound source. Of course, it is also good.
[0084]
In the above-described embodiment according to the present invention, the sound generation start instruction data (note on) and the sound generation stop instruction data (note off) output from the sequencer 18 are directly supplied to the sound source 20. Therefore, even if there is a key that is forcibly released when the number of key presses exceeds the maximum key press number n, the tone generator 20 generates a tone signal according to the performance data. Instead of this, the musical tone signal corresponding to the released key may be controlled to stop.
[0086]
【The invention's effect】
The present inventionSince it is configured as described above, it is possible to limit the key pressing time, and there is an excellent effect that current consumption can be prevented from exceeding the maximum rating of the power source.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an electronic musical instrument provided with an example of an embodiment of a keyboard device according to the present invention.
FIG. 2A is an explanatory diagram showing performance data in the first format, and FIG. 2B is an explanatory diagram showing performance data in the second format.
FIG. 3 is an explanatory diagram schematically showing a table for reserving sound generation stop instruction data (note-off).
FIG. 4 is a flowchart of a processing routine activated by a note event from a sequencer.
FIG. 5 is a flowchart of a regular service processing routine.
6A and 6B are waveform diagrams showing an initial drive waveform and a holding waveform of a drive signal output from a solenoid drive control unit. FIG.
FIG. 7 is a circuit diagram showing a mechanism for detecting a failure of an electronic switch.
[Explanation of symbols]
10 Central processing unit (CPU)
12 Bus
14 Read-only memory (ROM)
16 Random access memory (RAM)
18 Sequencer
20 sound sources
22 Sound system
24 Solenoid drive controller
26 Keyboard device
28 MIDI interface
30 keys
32 Solenoid
34 timer
100 External MIDI equipment

Claims (1)

In a keyboard device that drives a key in a depressed state in response to an instruction to start sounding performance data, and releases the key in response to an instruction to stop sounding performance data,
Detecting means for detecting the time from the sounding start instruction of the performance data to the sounding stop instruction;
Comparison means for comparing a time from a sound generation start instruction detected by the detection means to a sound generation stop instruction with a predetermined time;
When the comparison result of the comparing means is longer than the predetermined time from the sounding start instruction detected by the detecting means to the sounding stop instruction, the sounding is started from the sounding start instruction detected by the detecting means. A keyboard device having control means for shortening the time until the stop instruction.

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