JPH0486897A - Midi controller and midi system - Google Patents

Abstract

PURPOSE:To suppress such trouble that sound generation does not stop regardless of the pause state of a performance device by writing a supplied MIDI signal in a RAM when the signal is an operation-ON signal and erasing the corresponding operation-ON signal from the RAM when the signal is an operation-OFF signal. CONSTITUTION:When a play state changes into the pause state, note-OFF messages corresponding to note-ON messages (channel, note number, and velocity) of current sound generation are prepared and the sound generation is all stopped temporarily. Further, a note-ON message which is prepared repeated in the pause state is written in the RAM 25. When the pause state is reset and the play state is entered again, the note-ON messages stored in the RAM are all outputted to a MIDI equipment 26. Therefore, when the play state is entered again, the sound generation is started immediately.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to MID (Musical In
Strument Digital Interface
e) MIDI control device that controls the device and M including the same
Regarding the IDI system.

BACKGROUND ART Musical instruments such as synthesizers and electronic pianos can be interconnected to enable the exchange of information (the MIDI standard has been established).

An electronic musical instrument that is equipped with hardware based on the MIDI standard and has the function of transmitting and receiving MIDI control signals, which are musical instrument performance control signals in a format defined to carry music information, is called a MIDI device.

By the way, CD (compact disc), CD-V (
(Video), CD format LD (including digital audio) (
Subcodes are recorded on discs such as laser discs and tapes such as DAT.The subcodes are P, Q,
R, S, T, U, V.

It consists of W channels, of which P and Q channels are used for the purpose of controlling and displaying the disc player.

On the other hand, the R-W channel is an empty channel called a user's bit, and various applications such as graphics have been studied, and a standard for the graphic format has already been proposed.

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

In this case, in addition to supplying the audio/video signals played by the disc player to the AV system to view the program recorded on the disc, performance program information is also transmitted to one or more MIDI devices attached to the AV system. Various applications are being considered for the construction of immersive AV systems including electronic musical instruments and the creation of educational software.

By the way, MIDI equipment performs according to a musical instrument performance program formed by MIDI signals that are converted into serial signals from MIDI format signals included in subcode signals sequentially supplied from a disk player. If the operating mode enters a pause state while a musical instrument performance program is being supplied, the musical instrument performance program cannot be read out accurately and the continuity of the musical instrument performance program is interrupted.

As a result, problems may occur, such as, for example, the sound source of the MIDI device does not stop producing sound in a pause state where sound production needs to stop.

The reason for this is specifically explained as follows.

First, the MIDI signal supplied to the MIDI device has a transfer rate of 31. 25 (Kbaud) serial data, and one byte of data is composed of a total of 10 bits, including 8 bits of data and 1 bit each of a start bit and a stop bit.

Furthermore, at least one status byte for specifying the type of data to be sent and the MIDI channel, and one or two data bytes derived from the status are combined to form a message serving as performance information. Therefore, 1 message consists of 1 to 3 bytes,
The transfer requires a transfer time of 320 to 960 μsees. A musical instrument performance program is formed by a series of messages.

FIG. 6 shows the structure of a note-on message as an example of such a message.

The note-on message of the status byte, for example, is a command corresponding to the action of pressing a key on a keyboard, and is used in pair with the note-off message, which corresponds to the action of releasing a key on the keyboard. This is shown in FIG. 7(A).

The note number in data byte 1 specifies one of the 128 levels assigned to the keyboard, with 60 centered around the "middle C" of an 88-key piano. data byte 2
Velocity is generally used to differentiate the strength of a sound. MID that received a note on message
The I device generates a sound of a specified scale at a specified intensity. Furthermore, upon receiving a note-off message, the MIDI device operates to stop producing sound.

By the way, in the pause state, normally, as shown in FIG. 8, the pickup repeatedly traces one track T (the broken line indicates the next track) on the disk 1 while performing track jumps.

- Once the pause state is reached, the MIDI signal included in the repeated portion is repeatedly generated, resulting in a discontinuous disc performance state. Therefore, as shown in FIG. 7(B), if a pause state occurs after a note-on message is sent to the sound source to generate pronunciation 1, the corresponding note-off message becomes a pause state. If this does not occur before or during the pause state, a problem occurs in which the sound generation 1 does not stop.

These problems in pause mode are not limited to note-on messages, but also occur when using modulation channel pressure, pitch bend, hold,
The same applies to control operations such as press control.

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

[Structure of the invention]

A MIDI control device according to the present invention is a MIDI control device that supplies 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 performance device, and a sub-code decoder that decodes a MIDI signal including an operation-on signal and an operation-off signal; and an operation-off signal corresponding to the contents of the operation-on signal generated by the sub-code decoder is generated from the sub-code decoder. and 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 in response to a pause state signal representing a pause state from the recording medium playing device. After the operation of the OFF generation means is completed, the M is maintained until a pause release state signal representing a pause release state is supplied from the recording medium playing device.
The apparatus comprises a stop means for stopping the signal supply to the IDI device, and an on-generating means for supplying the MIDI device with an operation-on signal based on the contents of the operation-on signal stored in the storage means in response to the pause release state signal. It is a feature.

The MIDI system of the present invention includes a MIDI control means for supplying an operation on signal and an operation off signal to a MIDI device according to a MIDI format signal decoded from a subcode signal supplied from a recording medium playing means.
The system includes means for generating a pause state signal when the recording medium playing means enters a pause state and a means for generating a pause release state signal when the pause state is released, and means for decoding the subcode signal to generate an operation on signal and an operation signal. M including off signal
a sub-code decoder that generates an IDI signal; a storage means that stores the contents of an operation-on signal generated by the sub-code decoder until a corresponding operation-off signal is generated from the sub-code decoder; OFF generation means for supplying an operation OFF signal corresponding to the contents of the operation ON signal stored in the storage means to the MIDI device; and an on-generating means for supplying an operation-on signal to the MIDI device according to the content of the operation-on signal stored in the storage means in response to the pause release state signal. There is.

Furthermore, the MIDI system of the present invention can perform MIDI data decoded from subcode signals supplied from the recording medium playing means.
M including a MIDI control means for supplying an operation on signal and an operation off signal to the MIDI device according to the format signal.
The IDI system includes means for generating a pause state signal when the recording medium playing means enters the pause state and generating a pause release state signal when the pause state is released, and means for decoding the subcode signal to generate an operation on signal. and a subcode decoder that generates a MIDI signal including an operation off signal;
storage means for storing the contents of the operation-on signal generated by the sub-code decoder until the corresponding operation-off signal is generated from the sub-code decoder; Off generation means for supplying an operation off signal corresponding to the content of the signal to the MIDI device; and stop means for stopping the signal supply to the MIDI device after the operation of the off generation means is completed until a pause release state signal is supplied. , an on-generating means for updating and holding the operation-on signal generated from the sub-code decoder in the pause state and supplying the held operation-on signal to the MIDI device in response to the pause release state signal.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In Figure 1, a disc 1 on which multiple songs are recorded
is rotationally driven by a spindle motor 2. As the disk 1 rotates, signals recorded on the disk 1 are read by a pickup 3. The pickup 3 is carried by a carriage (not shown) that is moved in the radial direction of the disk 1 by a carriage motor 4, and the information reading point (information reading light spot) of the pickup 3 is freely positioned in the radial direction of the disk 1. Ru. 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.

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

So-called RF (high frequency) output from pickup 3
The signal is amplified by an RF amplifier 8 and then supplied to an EFM demodulation circuit 9. The EFM demodulation circuit 9 is configured to perform EFM demodulation processing on the pulse signal obtained by slicing the RF multiplied signal to form PCM data, that is, digital data and subcodes including time-division multiplexed left and right channel audio information. ing. This EFM
Digital data including audio information output from the demodulation circuit 9 is supplied to a deinterleaving/interpolation circuit 10, where the digital data is returned to its original order in cooperation with a RAM 11, and in cooperation with an error correction circuit 12. Error data is interpolated by The output data of the deinterleaving/interpolation circuit 10 is supplied to a D/A (digital-to-analog) conversion circuit 14 to become left and right channel audio signals. The reproduced audio signals of the left and right channels are supplied to audio output terminals via LPFs (low pass filters) 15 and 16.

On the other hand, the digital signal outputted from the deinterleaving/interpolation circuit 10 is outputted 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 made up of, for example, a microcomputer, and receives commands from the ROM according to key operations supplied from the operation unit 18.

After performing calculation operations based on data or programs stored in a RAM or the like, command signals such as play, search, and jump are supplied to the performance section control circuit 5. It also generates signals such as a play state signal and a pause state signal indicating the operation mode of the player, and these signals are transmitted to the MID
The signal is supplied to the I controller 24.

On the other hand, the subcode R9S, which is the user's bit,
Digital signals including T, U, V, W channels are sent to MI as serial signals via interface 17.
The signal is sent to the reception/decoding circuit 21 of the DI control device. The subcode signal obtained from the output of the reception decoding circuit 21 is supplied to a subcode error correction circuit 22 where subcode error correction is performed.

FIG. 2 shows an example of a data format configuration using subcode (7) R, S, T, U, V, and W channels. In FIG. 2, symbol 0 represents the type of data. For example, mode → 001, item - 001
In the case of , it indicates that the data is TV graphics data. Also, for example, mode→011. MIDI data is represented as item → OOO. Symbol 1 is in instruction mode, and in MIDI mode, 1
The value of the MIDI byte in the pack is recorded.

The data fields of symbols 4 to 19 carry graphics data and MIDI data.

Symbol 2. 3. A parity code for error correction is added to 20 to 23. The subcode error correction circuit 22 refers to the parity code, performs a so-called syndrome operation, detects a subcode error, and corrects the error. The operation of this error correction circuit 22 is well known and will not be described in detail. The error-corrected subcode is supplied to the MIDI ID-der 23.

The MIDIID-der 23 is a subcode decoder that takes in the subcode mode and item and decodes it into a serial MIDI signal when the subcode mode and item indicate MIDI data. The obtained MIDI signal is supplied to a MIDI device 26 via a MIDI controller 24. MIDI
The controller 24 sends note-off messages and the like as 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 writes it to the external RAM 25, and when the supplied MIDI signal is a note-off message, it writes it to the external RAM 25. - If it is an operation-off signal such as a message, the corresponding operation-on signal is erased from the RAM 25. In addition, in the case of Note on Message, the RAM
The contents written in 25 are data such as channel, note number and velocity. The RAM 25 is provided with a note-on area in which a plurality of note-on messages can be written as a map.

In FIG. 1, the portion surrounded by a broken line A is a disk player, and the portion surrounded by a broken line B is a MIDI control device. However, the invention is not limited thereto; for example, the interface 17 may be included in the MIDI control device, or the reception demodulation circuit 21 and subcode error correction circuit 22 may be included in the disc player.

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

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

In this pause interrupt operation, as shown in FIG. 3, the MIDI controller 24 determines whether or not the note-on message (channel, note number, and velocity) being sounded is written in the RAM 25 (step SL). ).

If a note-on message has been written, the note-on message is read out and a corresponding note-off message is created in step S2.
), MID consisting of created note-off messages
I signal from the MIDI controller 24 to the MIDI device 2
6 to erase the contents of the note-on message written in the RAM 25 (step S
3). It is determined whether or not any other note-on message has been written in the RAM 25 (step S4), and if any other note-on message has been written, the process advances to step S2 and the above operation is repeated. .

Here, select the note corresponding to the note fist on message.
An off message means that the channel and note number are the same. Note-off messages can also be played by setting velocity to a predetermined value (for example,
00+) and create it in a predetermined format as shown in Figure 6, or set the status byte as a note-off event (8n+) and use the channel, note number, and velocity of the read note-on message. It can also be used as a note-off message. However, the velocity does not have to be the same as the note-on message.

If no other note-on message is written in the RAM 25, the note-on message will be sent after entering the pause state.
The MIDI signal indicating the on message is MIDIID-
It is determined whether or not the data is supplied from the data source 23 (step S5).
). If it is a note on message, the same note on message as that note on message is R.
In step S6), it is determined whether or not the note-on data has already been written to the RAM 25.
Ignored if it is a message. In the case of a note-on message that has not been written, the note-on message
The message is written into 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 as a result of the play key or pause key being operated on the operation unit 18 (step S8). If the pause release state signal is not supplied, the process returns to step S5 and it is determined whether or not a new MIDI signal indicating a note-on message is supplied.

If the pause release state signal is supplied, it is determined whether a note-on message has been written in the RAM 25 (step S9). If a note-on message has been written, read the note-on message (step 510), and output a MIDI signal consisting of the read note-on message from the MIDI controller 24 to the MIDI device 26. (Step 511). It is determined whether or not other note-on messages have been written in the RAM 25 (step 512). If there are other note-on messages written, the process advances to step S10 and then to step 8.
The operations from 10 to S12 are repeated. If no other note-on message has been written to the RAM 25, the process returns to the main routine.

Therefore, when the play state changes to the pause state, note-off messages corresponding to each note-on message being produced at that time are created, and all sound production is temporarily stopped. Further, note-on messages repeatedly obtained during pauses are written into the RAM 25. When the pause state is released and the play state is restored, all note-on messages written in the RAM 25 at that time are output to the MIDI device 26.

Therefore, sound generation occurs immediately upon returning to the playing state.

Next, examples of other inventions of the present application will be shown. In this embodiment, the configuration shown in FIG. 1 is used as is. The difference from the above embodiment is the MIDIID upper roller 24.
This is the operation.

After starting the pause interrupt operation, the MIDIID upper roller 24 executes steps 81 to S4 as shown in FIG. 4 to generate note-off messages corresponding to each note-on message being sounded at the time. Create it and temporarily stop all pronunciation. This is the same operation as shown in FIG. Thereafter, it is determined whether a MIDI signal indicating a note-on message has been supplied (step 522). If it is a note-on message, the note-on message is written in a predetermined area different from the note-on area of the RAM 25 (step 823).
). Then, it is determined whether or not a pause release state signal indicating a pause release state is supplied from the player controller 7 as a result of the play key or pause key being operated on the operation unit 18 (step 524). If the pause release state signal is not supplied, the process returns to step S22 and it is determined whether 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 advances to step S23, where the new note-on message is written in a predetermined area of the RAM 25 and updated.

If the pause release state signal is supplied, it is determined whether a note-on message has been written in a predetermined area of the RAM 25 (step 525). If a note-on message has been written, the note-on message is read (step 526), and a MIDI signal consisting of the read note-on message is output from the MIDI ID upper roller 24 to the MIDI device 26. (step 527). Then return to the main routine.

Therefore, in this embodiment, when the play state changes to the pause state, the note-on messages that are being sounded at that time are read out from the RAM 25, note-off messages corresponding to each are created, and all sounds are played. Stop it once.

Thereafter, all note-on messages stored in the RAM 25 immediately before the pause are erased.

Note-on messages repeatedly obtained during pauses are written in a predetermined area of the RAM 25 while being updated. When the pause state is released and the play state is restored, the note-on message written in a predetermined area of the RAM 25 at that time is output to the MIDI device 26. Therefore, sound generation occurs immediately upon returning to the playing state.

In each of the embodiments described above, the MIDIID upper roller 2
4 directly to the MIDI device 26; however, the MIDI signal is not limited to this, and as shown in FIG.
There is an F I F between the upper roller 24 and the MIDI device 26.
An O (First-In-First-Out) type buffer 31 and switch 32 may be provided. When the buffer 31 and switch 32 are provided in this way, the switch 32 is turned off after creating a note-off message and temporarily stopping all sound production, and turned on when the pause state is released. . Further, the buffer 31 holds note-on messages that should be supplied to the MIDI device 26 when the pause state is released while the switch 32 is off. - The message is supplied to the MIDI device 26 via the switch 32.

Note that in each of the above embodiments, a single MIDI device is connected to the MIDI control device, but multiple MIDI
It is also possible to connect DI equipment, and the present invention can be applied in this case as well.

Further, the present invention is not limited to disk players, but can also be used, for example, when performing a pause operation of a recording medium playing device such as a tape deck that plays a magnetic tape on which a musical instrument playing program is recorded.

Further, the present invention provides note-on-message and note-on-message
The present invention is not limited to off messages, but can also be applied to other control messages for stopping control operations such as modulation channel pressure, pitch bend hold, press control, etc.

Effects of the Invention As described above, according to the present invention, the content of the operation on signal on the MIDI ID generated by the subcode decoder by decoding the subcode signal from the recording medium performance device is converted into the corresponding operation off signal. is generated from the sub-code decoder, and an operation off signal corresponding to the contents of the stored operation on signal is generated in response to a pause state signal representing a pause state from the recording medium playing device.
Since it is supplied to a DI device, for example, if the recording medium performance device enters a pause state, all sound generation up to that point will stop.
It is possible to prevent the occurrence of a problem in which the sound continues in the pause state. Also, the operation off signal is MID
Even after the signal is supplied to the MIDI device, in the pause state until the pause release state signal representing the pause release state is supplied from the recording medium performance device, even if the subcode decoder generates an operation on signal, the signal is not supplied to the MIDI device. This prevents the start of pronunciation during a pause, for example. Furthermore, since an operation-on signal based on the contents of the operation-on signal stored in response to the pause release state signal is supplied to the MIDI device, for example, after the pause is released,
Since the pronunciation starts immediately, there is no discomfort after the pause is released.

Furthermore, according to the present invention, the operation-on signal generated from the sub-code decoder in the pause state is updated and held, and the held operation-on signal is supplied to the MIDI device in accordance with the pause release state signal. Since the sound generation starts immediately after the pause is released, there is no discomfort after the pause is released.

[Brief explanation of the drawing]

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, FIG. 3 is a flowchart showing the control operation of a MIDI controller, and FIG. 4 is a diagram showing an example of the structure of subcode data. A flowchart showing the control operation of a MIDI controller according to another invention, FIG. 5 is a block diagram partially showing another embodiment of the present invention, and FIG.
Figures 7 (A) and (B) showing an example of the structure of the ID page.
8 is a diagram for explaining the generation timing of note-on messages and note-off messages, and FIG. 8 is a diagram showing a trace on the disc during a pause operation. Explanation of symbols of main parts 7...Disk controller 22...Subcode error correction circuit 23...MIDIID-da 24...MIDI controller 31...Buffer

Claims (3)

[Claims] (1) MIDI according to the MIDI format signal included in the subcode signal supplied from the recording medium performance device.
MID that supplies operation on signals and operation off signals to equipment
I control device includes a sub-code decoder that decodes the sub-code signal to generate a MIDI signal including the operation-on signal and the operation-off signal; storage means for storing an operation-off signal corresponding to the sub-code decoder until it is generated from the sub-code decoder; and an 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. an off generation means for supplying an operation off signal corresponding to the contents of the MIDI device to the MIDI device; and after the operation of the off generation means is completed, until a pause release state signal representing a pause release state is supplied from the recording medium playing device. a stop means for stopping the signal supply to the MIDI device; and an on-generating means for supplying the MIDI device with an operation-on signal based on the contents of the operation-on signal stored in the storage means in response to the pause release state signal. A MIDI control device comprising: (2) MIDI according to the MIDI format signal decoded from the subcode signal supplied from the recording medium playing means
M that supplies operation on signals and operation off signals to DI equipment
A MIDI system comprising an IDI control means, the means for generating a pause state signal when the recording medium playing means enters a pause state, and generating a pause release state signal when the pause state is released, and the subcode. an MID that decodes the signal and includes the operation on signal and the operation off signal;
a sub-code decoder that generates an I signal; a storage means that stores the contents of the operation-on signal generated by the sub-code decoder until a corresponding operation-off signal is generated from the sub-code decoder; and the pause state. 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 in response to the signal; and after the operation of the OFF generation means is completed;
the MIDI until the pause release status signal is provided.
a stop means for stopping the signal supply to the device; and a stop means for stopping the signal supply to the device; and a stop means for stopping the signal supply to the device;
1. A MIDI system comprising: on generation means for supplying to a device. (3) MIDI according to the MIDI format signal decoded from the subcode signal supplied from the recording medium playing means.
M that supplies operation on signals and operation off signals to DI equipment
A MIDI system comprising an IDI control means, the means for generating a pause state signal when the recording medium playing means enters a pause state, and generating a pause release state signal when the pause state is released, and the subcode. an MID that decodes the signal and includes the operation on signal and the operation off signal;
a sub-code decoder that generates an I signal; a storage means that stores the contents of the operation-on signal generated by the sub-code decoder until a corresponding operation-off signal is generated from the sub-code decoder; and the pause state. 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 in response to the signal; and after the operation of the OFF generation means is completed;
the MIDI until the pause release status signal is provided.
a stop means for stopping signal supply to the device; and a stop means for updating and holding the operation-on signal generated from the subcode decoder in the pause state, and transmitting the operation-on signal held in response to the pause release state signal to the MIDI device. An MI characterized by comprising: on-generation means for supplying
DI system.