JPH0455517B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a keyboard instrument having a function of transmitting performance information corresponding to the operating state of a performance operator (keyboard keys, etc.), and particularly relates to The present invention relates to a performance information transmission control device that controls the transmission of information.

[Prior art]

In recent years, MIDI (Musical
Instrument Digital Interface) is becoming widely used. MIDI is a system that allows electronic musical instruments, rhythm boxes, automatic performance devices (sequencers), etc. to have input/output terminals of a common standard to exchange performance information, and to ensure that the performance information exchanged is compatible. . As a result, even if the products are not the same or made by the same manufacturer, it is possible to connect them to each other and have them perform simultaneously, store performances, and perform synchronized performances.

Note that this MIDI is described in detail in, for example, the July 1984 issue of the magazine "Musical Instruments Shoho", pages 40 to 73.

[Problem that the invention seeks to solve]

In the above-mentioned MIDI-configured electronic musical instrument, if an on/off switch is provided to control the transmission/stop of performance information (MIDI data), and an attempt is made to control the MIDI data on/off in response to the operation of this switch. The following problems occur.

In other words, now from electronic musical instrument A to electronic musical instrument B.
Consider the case of sending MIDI data. When a certain keyboard key (hereinafter referred to as key
Data indicating a key-on event, data indicating the pitch of the key X, and data indicating the key touch intensity such as the pressing speed of the key X are output and supplied to the electronic musical instrument B. Electronic musical instrument B receives this MIDI data and generates a musical tone with the same pitch as the pitch of key X. Also,
When key X of electronic musical instrument A is released, electronic musical instrument A outputs data indicating the pitch of key X and data indicating a key-off event as MIDI data and supplies them to electronic musical instrument B. Electronic musical instrument B
receives this MIDI data and finishes generating musical tones of the same pitch as key X.

By the way, if the switch for controlling MIDI data transmission is turned off after electronic musical instrument A has outputted MIDI data related to the key-on of key
The musical tone corresponding to key X generated in electronic musical instrument B no longer stops, and the sound continues to play. Similarly, if you turn on the MIDI data transmission control switch after turning on key X, the MIDI data related to the key-on of key will not occur.

Note that the above problem occurs not only with keyboard keys but also with pedals or other operators.

[Means to solve the problem]

This invention was made in view of the above circumstances, and even when the switch for controlling performance information transmission is operated, the performance information transmission is not immediately turned on/off, but the operation of the performance controls is terminated. The on/off control of performance information transmission is performed after waiting for the performance information to be transmitted.

Note that the data whose transmission is controlled by the present invention is not limited to MIDI data, but may be data in other formats. Furthermore, the present invention includes not only one in which the above-described performance information transmission control is applied to both data transmission and transmission stop, but also one in which it is applied only to either data transmission or transmission stop.

〔Example〕

FIG. 1 is a block diagram showing an electronic musical instrument with a MIDI configuration to which a performance information transmission control device according to an embodiment of the present invention is applied. In this figure, reference numeral 1 denotes a keyboard, and below each key of this keyboard 1, a key switch is provided for turning on/off the key and detecting the strength of the key touch. This key switch is made up of fixed contacts NC, NO and a movable contact C that moves with the operation of the key, as shown by the symbol K in the figure.When the movable contact C is in contact with the contact NC, the key is turned off. But the contact
Key-on is detected when it touches NO, and when movable contact C leaves contact NC, the contact
The strength of the key touch is detected by the time it takes for the key to touch NO. The key switch circuit 2 is a CPU (central processing unit) 3 of the microcomputer section 3.
According to the instruction a, the output of each key switch of the keyboard 1 is sequentially outputted to the bus line 4. The sustain pedal 5 is a switch that is turned on/off in accordance with the operation of a sustain pedal provided on the electronic musical instrument, and its output is supplied to the bus line 4. Note that the sustain pedal is a pedal for sustaining the generated musical tone even after the key is turned off. The MIDI data output control switch 6 is, for example, a push-on/release-off type illuminated switch. When the switch 6 is pressed once, the illuminated lamp lights up and the MIDI data can be sent. When the switch 6 is pressed once more, the illuminated lamp lights up and MIDI data can be sent. , as the illumination lamp goes out,
MIDI data transmission is stopped. The switch unit 7 consists of a tone color selection switch and other various switches, and the output of each switch is output to the bus line 4, respectively.

The microcomputer section 3 includes a CPU 3a,
The ROM3b stores the programs used in this CPU3a and the ROM3b for data storage.
The RAM 3c includes registers such as those shown in FIG. 2, for example. The musical tone composition generating circuit 9 forms a musical tone signal based on the performance data supplied via the bus line 4 and outputs it to the sound system 10. The sound system 10 amplifies the supplied musical tone signal and then produces a musical tone from an internal speaker. MIDI interface circuit 11
transfers the performance data supplied via bus line 4 in accordance with the MIDI data transfer format.
After converting it into MIDI data, it is output from the MIDI/OUT terminal 12. Also, from the outside MIDI IN terminal 13
Performance data corresponding to the MIDI data supplied to the bus line 4 is output to the bus line 4.

Next, the processing process of the CPU 3a will be explained with reference to the flowcharts shown in FIGS. 3 and 4.
First, step S1 shown in FIG. 3 is an initial setting process performed when the power is turned on.
Processes such as clearing of each register (see FIG. 2) and initial setting of each part in the musical tone signal generation circuit 9 are performed. Next, step S2 is a key scan/key assignment process. When proceeding to this process, CPU3a
First, each key switch in the key switch circuit 2 is sequentially scanned to sequentially capture data indicating the state of each key switch, and the data indicating the state of each key switch and each key switch stored in the key switch register RO in the RAM 3c are Events (changes in key status) are detected by comparing the above-mentioned key switch information with the data showing the key switch status up to now.
Perform detection. When a key-on event is detected, the memory related to the key switch in the key switch register RO is updated, and
Channel allocation register R1 in RAM3c
Each memory slot R1-1, R1-2...R1-N
By sequentially scanning the KON bits in the memory slot R1-K, an empty channel (channel with KON bit = 0) is detected, and the key code KC of the newly turned on key is stored in the memory slot R1-K indicating the detected empty channel. Write the KON bit 1 and the touch data TD indicating the key touch strength. Additionally, if a key-off event is detected, the memory related to the key switch in the key switch register RO is updated, and the channel assignment register R is updated.
The KON bit in the memory slot R1-n in which the key code KC of the key turned off in 1 is written (allocated) is set to 0.

Note that the storage slots R1-1, R1-2...R1-N in the channel allocation register R1 are each
This corresponds to N musical tone signal channels (N is less than the number of keys) in the musical tone signal generation circuit 9.
Further, touch data TD is detected in the following manner. That is, the CPU 3a sets the timer register corresponding to the key switch to "0" when the movable contact C of the key switch leaves the contact NC, and increments the timer register every time a certain period of time elapses thereafter. CPU3a is
The data in the timer register at the time when it is detected that the movable contact C of the key switch is in contact with the contact NO indicates the touch data TD. As the key switch, instead of the above-mentioned changeover type switch, two make type switches which are turned on sequentially with a time difference as the key is pressed may also be used.

Next, step 3 is a switch scan register write process. When the CPU 3a proceeds to step S3, it first scans the sustain pedal switch 5 and each switch in the switch unit 7, sequentially captures data indicating the on/off status of each switch, and also indicates the captured status of each switch. By comparing the data with the data indicating the state of the previously imported switch among the switches stored in the switch register R2 in the RAM 3c,
Perform event detection. When a switch-on event is detected, 〓1〓 is written in memory slots R2-1, R2-2, etc. corresponding to the turned-on switch in switch register R2, and when a switch-off event is detected, When detected, memory slot R2 corresponding to the switch turned off
-1, R2-2...Write 〓0〓. Next, step S4 is a MIDI data output control switch process, and when the CPU 3a proceeds to step S4,
First, the MIDI data output control switch 6 is scanned to detect its on/off state, and if the switch 6 is on, the contents of the MIDI data output on/off register R3 (1 bit) in the RAM 3c are inverted. Then, when the content of register R3 after inversion is 〓1〓, 〓 is written in output on flag register F1.
1〓 is written, and when the contents of register R3 after inversion are 〓0〓, output off flag register F2 is written.
Write 〓1〓 inside. Next, flag register F
Check whether either 1 or F2 is 〓1〓, and if either is 〓1〓, proceed to step SB1 of the subroutine shown in Fig. 4, and both become 〓0〓.
If 〓, proceed to step S5. If the switch 6 is off, the flag registers F1 and F2 are checked without inverting the contents of the register R3, and depending on the result, the program proceeds to step SB1 or step S5 of the subroutine in the same manner as above. In step SB1, it is determined whether or not the music is currently being played. That is, each memory slot R1-1, R1-2, . . . of the channel allocation register R1
KON bit and switch register R2 memory slot R2-1 (sustain pedal switch 5
It is checked whether the bit signals in the memory slots corresponding to the memory slots are all 0. If any of the above-mentioned bit signals is not 0, that is, if the performance is in progress, no processing is performed and the process proceeds to step S5 in FIG. On the other hand, if each bit signal is all 0 (when not being played)
, proceed to step SB2. In step SB2, it is determined whether 〓1〓 is written in either flag register F1 or F2. If 〓1〓 is written in the flag register F1, the process advances to step SB3, and 〓1〓 is written in the flag register F2.
If 〓 is written, proceed to step SB4. At step SB3, 1 is written in the MIDI data output flag register F3 in the RAM 3C, and 0 is written in the flag register F1.
Also, in step SB4, flag register F2,
〓0〓 is written to F3. Then, proceed to step S5. In step S5, the contents of the storage slots R2-2, R2-3, . . . of the switch register R2 and the contents of the flag register F3 are output to the corresponding switch and switch 6, respectively.
As a result, the illumination lamp provided in each switch is turned on or off.

Next, step S6 is MIDI data creation and output processing. When the CPU 3a advances to this step S6,
First, performance data is created in accordance with the MIDI data format based on the contents of the channel assignment register R1 and the contents of the switch register R2. Next, flag register F3 in RAM3c
Check the contents of the flag register F3.
In the case of 1〓, the created performance data is sent to the musical tone signal generation circuit 9 and the MIDI interface circuit 11.
Also, the contents of flag register F3 are
In the case of 0, the created performance data is output only to the musical tone signal generation circuit 9. Then, the processing of the CPU 3a returns to step S2, and thereafter steps S2 and S3 are executed.
...Repeat the process of S6.

In this way, in the above embodiment, when the MIDI data output control switch 6 is pressed, if the MIDI data output control switch 6 is in the middle of a performance, this operation is not accepted (the flag F3 is not set or reset), and the performance ends. Wait for it to happen and accept it. This processing makes it possible to solve problems such as the sound of an external electronic instrument continuing to play.

In the above embodiment, when the content of the flag register F33 is 0, the CPU 3a does not output performance data to the MIDI interface circuit 11.
3a stores the performance data as 〓1 of flag register F3.
Interface circuit 1 regardless of 〓/〓0〓
The contents of the flag register F3 may also be output to the interface circuit 11 at the same time as the contents of the flag register F3, and the interface circuit 11 may control the output of MIDI data based on the contents of the flag register F3. Moreover, it may be configured by hardware instead of microcomputer processing. Also, the steps in Figure 4
The judgment of SB1 is not limited to the above example.
At least it is sufficient to detect whether or not there is a key being pressed. Further, although the above embodiment uses the sound assignment method, the present invention can of course be applied to electronic musical instruments using methods other than the sound assignment method. moreover,
The present invention can also be applied to keyboard instruments other than electronic musical instruments, such as keyboard devices, pianos, and electric pianos that have only a keyboard section and a MIDI data output control switch 6 without a musical tone signal generation circuit or sound system. In this case, a key switch is provided for each key on a keyboard such as a piano, and a pedal switch is provided for each pedal, and the on/off status of each of these switches is
Create MIDI data. Then, the configuration according to the above embodiment is applied to control the output of this MIDI data.

〔Effect of the invention〕

As explained above, according to the present invention, performance information can be accurately sent out in response to performance operations, and unlike conventional musical sound generation devices (electronic musical instruments) to which performance information is sent, the sound is emitted repeatedly. This has the effect of preventing problems such as pausing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an electronic musical instrument to which an embodiment of the present invention is applied, FIG. 2 is a diagram showing the main registers provided in the RAM 3c in FIG. 1, and FIGS. Each figure is a diagram showing the processing process of the CPU 3a in FIG. 1. 1...Keyboard, 3a...CPU, 3b...ROM,
3c...RAM, 5...Sustain pedal switch, 6...MIDI data output control switch, 1
1...MIDI interface circuit.

Claims (1)

[Scope of Claims] 1 (a) Performance information sending means having a function of sending out performance information corresponding to the operation state of a performance controller including at least a key; (b) Turning on/off of the transmission of the performance information; (c) detection means for detecting whether or not the performance controller is being operated; (d) the switch means is operated and the performance controller is operated. A performance information transmission control device comprising: control means for transmitting or stopping transmission of the performance information when the detection means detects that the performance information is not in progress.