JPH0727367B2 - MIDI controller and MIDI system - Google Patents

Description

TECHNICAL FIELD The present invention relates to MIDI (Musical Instrument Digital Interface).
ce) A MIDI control device for controlling a device and a MIDI system including the same.

BACKGROUND ART MIDI standards have been established to enable the exchange of information by connecting and connecting musical instruments such as synthesizers and electronic pianos.

MIDI, which is a musical instrument performance control signal of a format defined to carry music information, equipped with the hardware according to the MIDI standard.
An electronic musical instrument having a function of transmitting and receiving control signals is called a MIDI device.

By the way, CD (compact disc), CD-V (video),
A subcode is recorded on a disc such as an LD (laser disc) including a CD format digital sound or a tape such as a DAT. The subcode consists of P, Q, R, S, T, U, V and W channels, of which the P and Q channels are used for the purpose of controlling and displaying the disc player.

On the other hand, the R to W channels are empty channels called user's bits, various applications such as graphics have been studied, and a standard for a graphic format has already been proposed.

Also, a MIDI format signal can be recorded in this user's bit, and a standard has already been proposed.

In this case, in addition to supplying the audio / video signal reproduced by the disc player to the AV system to watch the program recorded on the disc, the performance program information is provided to one or more MIDI devices installed in the AV system. Since it can be supplied, various applications such as the construction of an AV system with a realistic sensation including electronic musical instruments and the creation of educational software are being studied.

By the way, a MIDI device plays according to a musical instrument playing program formed by a MIDI signal obtained by converting a MIDI format signal included in subcode signals sequentially supplied from the disc player into a serial signal. If the operation mode is in the pause state while supplying the musical instrument playing program, the musical instrument playing program cannot be accurately read subsequently,
The continuity of the musical instrument playing program is broken. As a result, for example, in the pause state when the pronunciation needs to be stopped, MIDI
Problems may occur such as the sound from the sound source of the device does not stop.

The reason will be described in detail below.

First, the MIDI signal supplied to a MIDI device has a transfer rate of 31.2
It is serial data of 5 [Kbaud], and a total of 10 bits, that is, 8-bit data and 1-bit start bit and stop bit, constitutes 1-byte data.

Further, at least one status byte for designating the type of data to be sent and the MIDI channel and one or two data bytes guided by the status are combined to form a message as performance information. Therefore, one message is composed of 1 to 3 bytes, and its transfer requires a transfer time of 320 to 960 [μsec].
A musical instrument playing program is formed by a series of messages.

The structure of a note-on message is shown in FIG. 6 as an example of such a message.

The note-on message of the status byte is, for example, a command corresponding to the operation of pressing the keyboard of the keyboard, and is used as a pair with the note-off message of the operation of releasing the keyboard of the keyboard. This is shown in FIG. 7 (A). The note number of data byte 1 designates one of the 128 steps assigned to the keyboard with the center "C" of the 88-key piano as the center. The velocity of the data byte 2 is generally used to make a difference in the strength of the sound. Upon receiving the note-on message, the MIDI device generates a sound of a specified scale with a specified intensity. Also, the MIDI device operates so as to stop the sound generation by receiving the note-off message.

By the way, in the paused state, normally, as shown in FIG. 8, one track T (the broken line is the next track) of the disk 1 is repeatedly traced while the pickup makes a track jump. Once in a pose,
The MIDI signal contained in the repeated portion is repeatedly generated, resulting in a discontinuous disc playing state. Therefore, as shown in FIG. 7B, when the note-on message is sent to the sound source to generate the sound 1 and the pause state is reached, the corresponding note-off message is changed to the pause state. If it does not occur before or in the paused state, the problem that the pronunciation 1 does not stop occurs.

Such problems in pause mode are not limited to sounding by note-on messages, but also modulation channel pressure, pitch bend, hold,
The same applies to control operations such as breath control.

SUMMARY OF THE INVENTION [Object of the Invention] An object of the present invention is to control a defect such as the sound generation in the pause state of the recording medium playing device not stopping.
It is to provide a MIDI control device and a MIDI system.

[Constitution of the Invention] A MIDI control device according to the present invention is a MIDI control device for supplying an operation ON signal and an operation OFF signal to a MIDI device in accordance with a MIDI format signal included in a subcode signal supplied from a recording medium playing device. Yes, a subcode decoder that decodes a subcode signal to generate a MIDI signal including an operation on signal and an operation off signal, and an operation off signal corresponding to the content of the operation on signal generated by the subcode decoder is a subcode. A storage means for storing until generated by the decoder, and an operation off signal corresponding to the content of the operation on signal stored in the storage means in response to the pause state signal indicating the pause state from the recording medium playing device to the MIDI device. After the operation of the off generation means for supplying and the off generation means is completed, the pause release state signal indicating the pause release state from the recording medium playing device is transmitted. Stop means for stopping the signal supply to the MIDI device until it is supplied, and ON generation means for supplying the MIDI device with an operation ON signal according to the contents of the operation ON signal stored in the storage means in response to the pause release state signal. It is characterized by consisting of.

The MIDI system of the present invention is a MIDI system including a MIDI control means for supplying an operation ON signal and an operation OFF signal to a MIDI device in accordance with a MIDI format signal decoded from a subcode signal supplied from a recording medium playing means. A means for generating a pause state signal when the recording medium playing means is in a pause state and a pause release state signal when the pause state is released; and an operation ON signal and an operation OFF signal for decoding the subcode signal. A sub-code decoder for generating a MIDI signal including, a storage means for storing the content of the operation-on signal generated by the sub-code decoder until a corresponding operation-off signal is generated by the sub-code decoder, and a pause state signal An OFF generation means for supplying an operation OFF signal corresponding to the content of the operation ON signal stored in the storage means to the MIDI device, After the operation of the off generation means is completed, the stop means for stopping the signal supply to the MIDI device until the pause release state signal is supplied, the operation according to the content of the operation on signal stored in the storage means according to the pause release state signal It is characterized by comprising an ON generation means for supplying an ON signal to a MIDI device.

Further, the MIDI system of the present invention is a MIDI system including a MIDI control means for supplying an operation ON signal and an operation OFF signal to a MIDI device in accordance with a MIDI format signal decoded from a subcode signal supplied from a recording medium playing means. And a means for generating a pause state signal when the recording medium playing means is in a pause state and a pause release state signal when the pause state is released, and an operation ON signal and an operation by decoding the subcode signal. A subcode decoder for generating a MIDI signal including an off signal, a storage means for storing the contents of the operation on signal generated by the subcode decoder until a corresponding operation off signal is generated by the subcode decoder, and a pause The operation off signal corresponding to the content of the operation on signal stored in the storage means according to the status signal is set to MI.
OFF generation means to be supplied to the DI device, stop means for stopping the signal supply to the MIDI device until the pause release state signal is supplied after the operation of the off generation means is completed, and the sub code decoder in the pause state. The operation-on signal is updated and held, and the operation-on signal that is held according to the pause-released state signal is supplied to the MIDI device.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, a disc 1 on which a plurality of songs are recorded
Are driven to rotate by the spindle motor 2. A signal recorded on the disc 1 is read by the pickup 3 as the disc 1 rotates. The pickup 3 is carried by a carriage (not shown) that moves in the radial direction of the disc 1 by a carriage motor 4, and an information reading point (information reading light spot) of the pickup 3 is freely positioned in the radial direction of the disc 1. It Further, various servo systems such as a spindle servo system, a focus servo system, a tracking servo system, and a carriage servo system are provided, but they are not shown because they are already well known.

The spindle motor 2 and the carriage motor 4 are driven by a spindle servo system, a carriage servo system or a performance section control circuit 5. The playing section control circuit 5 is configured to drive the spindle motor 2 and the carriage motor 4, on / off control of various servo systems (not shown), jump control, etc. in response to a command from the player controller 7.

A so-called RF (high frequency) signal output from the pickup 3 is amplified by the RF amplifier 8 and then supplied to the EFM demodulation circuit 9. The EFM demodulation circuit 9 is configured to perform EFM demodulation processing of a pulse signal obtained by slicing an RF signal to form PCM data, that is, digital data including time-division multiplexed left and right channel audio information and a subcode. ing. The digital data including the audio information output from the EFM demodulation circuit 9 is supplied to the deinterleave / interpolation circuit 10, the arrangement of the digital data is restored by the cooperation with the RAM 11, and the error correction circuit 12 is used. Error data is interpolated by cooperation. The output data of the deinterleave / interpolation circuit 10 is supplied to a D / A (digital / analog) conversion circuit 14 to become audio signals for both left and right channels. The reproduced audio signals of the left and right channels are supplied to the audio output terminals via LPFs (low pass filters) 15 and 16.

On the other hand, the digital signal output from the deinterleave / interpolation circuit 10 is output from the disc player in a format conforming to the digital audio interface standard. The subcode P and Q channel data are supplied to the player controller 7.

The player controller 7 is composed of, for example, a microcomputer, and performs an arithmetic operation based on data or a program stored in ROM, RAM or the like according to a command supplied from the operation unit 18 according to a key operation. Command signals for play, search, jump, etc. are supplied to the performance section control circuit 5. In addition, signals such as a play state signal and a pause state signal indicating the operation mode of the player are generated,
The signal is supplied to the MIDI controller 24 described later.

On the other hand, R, S, T, U, V of the subcode that is the user's bit
Interface 17 for digital signals including W channel
Is transmitted to the reception / decoding circuit 21 of the MIDI control device as a serial signal via. The subcode signal obtained from the output of the reception / decoding circuit 21 is supplied to the subcode error correction circuit 22 to perform subcode error correction.

Here, FIG. 2 shows an example of the data format configuration of the R, S, T, U, V and W channels of the subcode. In FIG. 2, symbol 0 represents the type of data. For example, the case of mode → 001 and item → 001 indicates that the data is TV graphics data. Also, for example, mode →
Shows MIDI data as 011, item → 000. Symbol 1 is in the instruction mode, and in the MIDI mode, the numerical value of the MIDI byte in one pack is recorded. The data fields of symbols 4 to 19 carry graphics data and MIDI data. Symbol 2,3,20
A parity code for error correction is added to 23. The subcode error correction circuit 22 refers to such a parity code to detect a subcode error by so-called syndrome operation and correct the error. The operation of the error correction circuit 22 is well known and will not be described in detail. The error-corrected subcode is supplied to the MIDI decoder 23.

The MIDI decoder 23 has subcode modes and items.
When showing MIDI data, import this
It is a subcode decoder that decodes MIDI signals. The obtained MIDI signal is supplied to the MIDI device 26 via the MIDI controller 24. The MIDI controller 24 sends out a note-off message or the like when necessary.

The MIDI controller 24 is composed of a microcomputer, etc., and when the supplied MIDI signal is an operation ON signal such as a note on message, it is sent to the external RAM 25.
When the supplied MIDI signal is an operation off signal such as a note off message, the operation on signal corresponding thereto is erased from the RAM 25. In the case of the note-on message, the contents to be written in the RAM 25 are data such as channel, note number and velocity. The RAM 25 has a note-on area in which a plurality of note-on messages can be written as a map.

In FIG. 1, the part surrounded by the broken line A is a disc player, and the part surrounded by the broken line B constitutes a MIDI control device. However, it is not limited to this,
For example, the interface 17 may be included in the MIDI control device, or the reception demodulation circuit 21 and the subcode error correction circuit 22 may be included in the disc player side.

The operation of the processor (not shown) in the MIDI controller 24 having the above configuration will be described.

As a main routine, the processor of the MIDI controller 24 writes and erases channels, note numbers and velocities in the RAM 25. During the processing of this main routine, when a pause state signal indicating that the mode is in the pause state is supplied from the player controller 7 by the pause command of the operation unit 18, the pause interrupt operation is started.

In this pause interruption operation, as shown in FIG.
It is determined whether or not an on message (channel, note number and velocity) has been written (step S1). If a note-on message has been written, that note-on message is read and a note-off message corresponding to it is created (step S2), and the MIDI signal composed of the created note-off message is output. The note-on data written in RAM 25 is output from MIDI controller 24 to MIDI device 26.
Delete the contents of the message (step S3). It is determined whether or not another note-on message is written in the RAM 25 (step S4). If another note-on message is written, the process proceeds to step S2 and the above operation is repeated. is there.

Here, the note corresponding to the note on message
The off message means that the channel and the note number are the same. In addition, note-off message has a specified velocity (eg,
00 _H ) and then create it in the specified format as shown in Fig. 6, or use the status byte as a note-off event (8n _H ) and read the note-on message channel, note number and velocity. May be used as a note-off message. However,
Velocity does not have to be the same as Note On Message.

If no other note-on message has been written to the RAM 25, it enters a pause state, and then it is determined whether or not a MIDI signal indicating the note-on message is supplied from the MIDI decoder 23 (step S5). ). If it is a note-on message, it is determined whether or not the same note-on message as that note-on message has been written to RAM25 (step S6), and the note-on message already written to RAM25. Ignore if. If the note-on message has not been written, the note-on message is written to the RAM 25 (step S7). Then, it is determined whether or not a pause release state signal indicating a pause release state is supplied from the player controller 7 by operating the player or the pause key on the operation unit 18 (step S8). If the pause-released state signal has not been supplied, the process returns to step S5 to determine whether or not a new MIDI signal indicating a note-on message has been supplied.

When the pause release state signal is supplied, it is determined whether or not a note-on message is written in the RAM 25 (step S9). If a note-on message has been written, that note-on message is read (step S10), and the read note-on message is read.
A MIDI signal consisting of a message is sent from the MIDI controller 24.
Output to the MIDI device 26 (step S11). RAM25
It is determined whether or not another note-on message is written in (step S12), and another note-on message is written.
If the message is written, the process proceeds to step S10 and the operations of steps S10 to S12 are repeated. RAM2
If no other note-on message is written in 5, the process returns to the main routine.

Therefore, when the play state changes to the pause state, a note-off message corresponding to each note-on message that is being sounded at that time is created, and all sound generation is temporarily stopped. In addition, note-on messages that are repeatedly obtained during pause are written in RAM25. When the pause state is canceled and the game returns to the play state, RA
All the note-on messages written in M25 are output to MIDI device 26. Therefore, sound is generated immediately after returning to the play state.

Next, another embodiment of the present invention will be described. In this embodiment, the structure shown in FIG. 1 is used as it is. The part different from the above embodiment is the operation of the MIDI controller 24.

After starting the pause interrupt operation, the MIDI controller 24 executes steps S1 to S4 as shown in FIG. 4 and creates a note-off message corresponding to each note-on message being sounded at that time. Then stop all pronunciations. This is the same as the operation shown in FIG. Then, it is determined whether or not the MIDI signal indicating the note-on message is supplied (step S22). If it is a note-on message, the note-on message is written in a predetermined area other than the note-on area of RAM 25 (step S23). Then, it is determined whether or not the pause release state signal indicating the pause release state is supplied from the player controller 7 by operating the play key or the pause key on the operation unit 18 (step S2).
Four). If the pause-released state signal has not been supplied, the process returns to step S22 to determine whether or not a new MIDI signal indicating a note-on message has been supplied. If a MIDI signal indicating a new note-on message is supplied, the process proceeds to step S23 and the new note-on message is received.
The message is written in a predetermined area of RAM 25 and updated.

When the pause release state signal is supplied, it is determined whether or not a note-on message is written in a predetermined area of the RAM 25 (step S25). If a note-on message has been written, that note-on message is read (step S26), and the MIDI signal consisting of the read note-on message is output from the MIDI controller 24 to the MIDI device 26. (Step S27). Then, the process returns to the main routine.

Therefore, in such an embodiment, when the play state changes to the pause state, the note-on messages that are being sounded at that time are read from the RAM 25, and the note-off messages corresponding to each of them are created to generate all sounds. Stop once. After that, all the note-on messages stored in RAM 25 just before the pause are erased.
The note-on message repeatedly obtained during the pause is updated and written in a predetermined area of the RAM 25. When the paused state is released and the play state is restored, the note-on message written in the predetermined area of the RAM 25 at that time is output to the MIDI device 26. Therefore, sound is generated immediately after returning to the play state.

In each of the above embodiments, from the MIDI controller 24
MIDI signals are directly supplied to the MIDI device 26, but not limited to this, as shown in FIG.
FIFO (First-In-First-Out) type buffer between 26 and
31 and the switch 32 may be provided. Buffer like this
In the case where 31 and the switch 32 are provided, the switch 32
Is turned off after composing a note-off message and temporarily stopping all sounds, and turned on when the pause state is released. In addition, the buffer 31 holds a note-on message to be supplied to the MIDI device 26 when the pause state is released while the switch 32 is off,
Note-on data held in buffer 31 when 32 is turned on
The message is supplied to the MIDI device 26 via the switch 32.

In each of the above embodiments, a single MIDI device
Although it is connected to the MIDI control device, it is also possible to connect a plurality of MIDI devices, and the present invention can be applied to this case as well.

Further, the present invention is not limited to a disc player, and can be used, for example, when performing a pause operation of a recording medium playing device such as a tape deck playing a magnetic tape on which a musical instrument playing program is played. .

In addition, the present invention provides note-on-message and
Not only the off message, but also a control message for stopping the control operation such as other modulation channel pressure, pitch bend hold, breath control or the like can be applied.

As described above, according to the present invention, the contents of the operation ON signal as a MIDI signal generated by the subcode decoder by decoding the subcode signal from the recording medium playing device are converted into the corresponding operation OFF signal. An operation off signal corresponding to the content of the operation on signal stored at least until generated by the sub-code decoder and corresponding to the pause state signal indicating the pause state from the recording medium playing device is supplied to the MIDI device. Therefore, for example, when the recording medium playing device is in the paused state, all the sounds up to that point are stopped, so that it is possible to prevent the occurrence of the problem that the sounding continues in the paused state. Even after the operation off signal is supplied to the MIDI device, even if the sub code decoder generates the operation on signal in the pause state until the pause release state signal indicating the pause release state from the recording medium playing device is supplied. Since the signal supply to the MIDI device is stopped, for example, it is possible to prevent the pronunciation from being started during the pause. Further, since the operation-on signal according to the content of the operation-on signal stored according to the pause-released state signal is supplied to the MIDI device, for example, sound is started immediately after the pause is released. Never.

Further, according to the present invention, the operation ON signal generated from the subcode decoder in the pause state is updated and held, and the operation ON signal held according to the pause release state signal is supplied to the MIDI device. Since the pronunciation starts immediately after the pause is released, there is no sense of discomfort after the pause is released.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining a configuration example of subcode data, and FIG. 3 is
FIG. 4 is a flow chart showing the control operation of the MIDI controller, FIG. 4 is a flow chart showing the control operation of the MIDI controller according to another invention of the present application, FIG. 5 is a block diagram partially showing another embodiment of the present invention, and FIG. Is a diagram showing a configuration example of a MIDI message, FIGS. 7 (A) and 7 (B) are diagrams for explaining the timing of occurrence of a note-on message and a note-off message, and FIG. 8 is a diagram showing a pause operation. It is a figure which shows the trace in a disc. Explanation of main part code 7 …… Disk controller 22 …… Subcode error correction circuit 23 …… MIDI decoder 24 …… MIDI controller 31 …… Buffer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Suzuki 4-15-5 Omorinishi, Ota-ku, Tokyo Pioneer Co., Ltd. Omori Plant (72) Inventor Toshiyuki Katsu 4-15 Omorinishi, Ota-ku, Tokyo 5 Pioneer Co., Ltd. Omori Plant (72) Inventor Tatsu Iizuka 4-15 Omori Nishi, Ota-ku, Tokyo Pioneer Co., Ltd. Omori Plant (72) Inventor Kiyomi Yatsuhashi Omori Nishi, Ota-ku, Tokyo 4-15-5 Pioneer Co., Ltd. Omori Plant (72) Inventor Hidenori Hidaka 4-15-5 Omori Nishi, Ota-ku, Tokyo Pioneer Co., Ltd. Omori Plant

Claims (3)

[Claims] 1. A MIDI control device for supplying an operation ON signal and an operation OFF signal to a MIDI device according to a MIDI format signal included in a subcode signal supplied from a recording medium playing device, wherein the subcode signal is supplied to the MIDI device. A subcode decoder which decodes to generate a MIDI signal including the operation on signal and the operation off signal, and an operation off signal corresponding to the content of the operation on signal generated by the subcode decoder from the subcode decoder A storage means for storing until generation, and an operation off signal corresponding to the content of the operation on signal stored in the storage means in response to a pause state signal representing a pause state from the recording medium playing device. Off generating means for supplying to the recording medium playing device, and a pause indicating a pause released state from the recording medium playing device after the operation of the off generating means is completed. And stopping means allowed to stop the signal supply to the MIDI device to dividing state signal is supplied,
The operation-on signal according to the content of the operation-on signal stored in the storage means according to the pause release state signal is
A MIDI control device comprising an ON generation means for supplying to a MIDI device. 2. MI in response to a MIDI format signal decoded from a subcode signal supplied from a recording medium playing means.
MIDI that supplies operation on and off signals to DI devices
A MIDI system including control means, means for generating a pause state signal when the recording medium playing means is in a pause state, and a pause release state signal when the pause state is released, and the subcode signal And a sub-code decoder that decodes an operation-on signal and an operation-off signal to generate a MIDI signal, and an operation-off signal corresponding to the content of the operation-on signal generated by the sub-code decoder. Storage means for storing until the generation of the operation state signal, off generation means for supplying an operation off signal corresponding to the content of the operation on signal stored in the storage means in response to the pause state signal to the MIDI device, After the operation of the off generation means is completed, a stop means for stopping the signal supply to the MIDI device until the pause release state signal is supplied, A MIDI system comprising an ON generation means for supplying an operation ON signal according to the content of the operation ON signal stored in the storage means to the MIDI device in response to the pause release state signal. 3. MI according to a MIDI format signal decoded from a subcode signal supplied from a recording medium playing means.
MIDI that supplies operation on and off signals to DI devices
A MIDI system including control means, means for generating a pause state signal when the recording medium playing means is in a pause state, and a pause release state signal when the pause state is released, and the subcode signal And a sub-code decoder that decodes an operation-on signal and an operation-off signal to generate a MIDI signal, and an operation-off signal corresponding to the content of the operation-on signal generated by the sub-code decoder. Storage means for storing until the generation of the operation state signal, off generation means for supplying an operation off signal corresponding to the content of the operation on signal stored in the storage means in response to the pause state signal to the MIDI device, After the operation of the off generation means is completed, a stop means for stopping the signal supply to the MIDI device until the pause release state signal is supplied, In the pause state, the operation-on signal generated from the sub-code decoder is updated and held, and the operation-on signal held according to the pause-released state signal is supplied to the MIDI device. And MIDI system.