JPH03259298A - Midi controller and midi system - Google Patents

Abstract

PURPOSE:To suppress the generation of trouble by storing the contents of an operation ON signal until a corresponding operation OFF signal is generated by a subcode decoder. CONSTITUTION:A subcode signal has a subcode block composed of subcode frames SF0 - SF97 and a subcode frame consists of channels P - W of subcode symbols. Then the contents of the operation ON signal as the MIDI(Musical Instrument Digital Interface) signal generated by the subcode decoder by decoding the subcode signal from a recording medium player are stored at least until the corresponding operation OFF signal is generated by the subcode decoder and subcode symbols are counted in one-subcode block units; when the counted value in one subcode block is not a specific value, the operation OFF signal corresponding to the contents of the stored operation ON signal is supplied to a MIDI equipment. Consequently, trouble is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to M I D I (Musical I
nstrument DigItal Interfa
ce) A MIDI control device for controlling equipment and a MIDI system including the same.

Background Art The MIDI standard has been established to enable musical instruments such as synthesizers and electronic pianos to be interconnected and exchange information.

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 disks such as laser disks 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, audio, and one image are being considered, and a standard for the graphic format has already been proposed.

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. Since it becomes possible to supply such materials, many 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 an instrument performance program formed by MIDI signals that are serially converted from MIDI format signals sequentially supplied from a disk player. If an operation that involves a track jump is received while the instrument is running, the musical instrument performance programs cannot be subsequently read out in the order in which they were written, and the continuity of the musical instrument performance programs is interrupted. As a result, problems may occur, such as the sound source of the MIDI device not stopping.

The reason for this is specifically explained as follows.

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

Further, at least one status byte for specifying 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 music information. Therefore, 1 message consists of 1 to 3 bytes,
The transfer requires a transfer time of 320 to 960 [μSeC]. A musical instrument performance program is formed by a series of messages.

As an example of such a message, the structure of a note-on message, which is one of the channel voice messages, is shown in FIG.

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. 6(A).

The note number of data byte 1 is 128, which is assigned to the keyboard centered on "middle C" of an 88-key piano.
Specify one of the stages. The velocity of data byte 2 is generally used to differentiate the strength of the sound. A MIDI device that receives a note-on message generates a note of the specified scale at a specified intensity.

Further, upon receiving a note-off message, the MIDI device operates in the same manner as, for example, releasing a key on a keyboard.

By the way, as shown in FIG. 6(B), after a note-on message is sent to sound source 1 and before a note-off message is sent, a track jump performance state such as manual search 2 track search occurs. or if there is a trace error or noise in the player,
As time passes, musical instrument performance programs based on MIDI signals that are supposed to run continuously may be partially missing or the progress of the program may stop. As a result, as in sound source 1, a problem occurs in which the sound generation does not stop due to missing note-off messages. In particular, it is difficult to deal with such a problem when there are 10 types of sound sources and they are played overlappingly at the same time.

Such a problem is not limited to the case where a note-off message is missing, but also occurs when control operations such as modulation channel pressure, pitch bend hold, press control, etc. have to be stopped.

Summary of the Invention [Object of the Invention] The object of the present invention is to suppress the occurrence of defects due to missing musical instrument performance programs when a track jump performance occurs, a player trace error occurs, or noise is mixed in. An object of the present invention is to provide a MIDI control device and a MIDI system including the same.

[Configuration 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 in accordance with a MIDI format signal included in a subcode signal supplied from a recording medium performance device. There is a sub-code decoder that decodes the sub-code signal to generate a MIDI signal including an operation-on signal and an operation-off signal, and a corresponding operation-off signal that converts the contents of the operation-on signal generated by the sub-code decoder. a storage means for storing at least until the subcode signal is generated; a storage means for counting the number of subcode symbols for each subcode block of the subcode signal; The MIDI apparatus is characterized by comprising forced release 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 when the MIDI device receives the operation-on signal stored in the storage means.

Further, the MIDI system according to the present invention is a MIDI system that is decoded from a subcode signal supplied from a recording medium playing means.
A MIDI system that includes a MIDI control means that supplies an operation on signal and an operation off signal to a MIDIi device according to an I format signal, and generates a MIDI signal including an operation on signal and an operation off signal by decoding a subcode signal. a sub-code decoder; a storage means for storing at least 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; Count the number of subcode symbols, and when the counted value in one subcode block becomes a value other than a predetermined value, supply an operation off signal corresponding to the contents of the operation on signal stored in the storage means to the MIDI device. It is characterized by including a forced release means.

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 audio information of both left and right channels. 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 the RAM II, and in cooperation with the 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 and becomes audio signals for both left and right channels. The reproduced audio signals of both left and right channels are supplied to an audio output terminal 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.

On the other hand, RlS, T of the subcode which is the user's bit
, U, V, and W channels are sent via the interface 17 to the receiving/decoding circuit 21 of the MIDI control device as a serial signal. The subcode signal is divided into subcode frames SFO and SFO as shown in FIG.
FI, SF2゜...5F97 form one subcode block, subcode frames SFO, SFI consist of subcode synchronization signals (SO, Sl), and subcode frames SF2. ...5F97 consists of subcode symbols (P, Q, R, S, T, U, V, W channels). 24 of these symbols form one data format (one buck). Therefore, one subcode block transmits four batches.

Subcode data 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. Here, subcode (7)R,
FIG. 3 shows an example of a data format configuration using S, T, U, V, and W channels.

In FIG. 3, 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. Further, for example, MID data is represented as mode-011° item→000.

Symbol 1 is in instruction mode,
The numerical value of MIDI bytes within one pack is recorded. The data fields of symbols 4 to 19 carry graphics data and MIDI data. symbol 20-2
3 has a parity code added for error correction. 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 MIDIID-
23.

The MIDIID-der 23 is a subcode decoder that takes in the subcode mode and item and decodes it into a 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.

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 as described later, it writes it to the external RAM 25 and outputs the supplied MIDI signal.
If the DI signal is an operation-off signal such as a note-off message, the corresponding operation-on signal is stored in RAM2.
Delete from 5.

Furthermore, the subcode error correction circuit 22 performs 3 subcode error correction circuits in 1 pack (24 subcode symbols) during subcode error detection.
When a subcode error of a subcode symbol or more is detected, it is determined that subcode error correction is impossible and an uncorrectable signal is output to the MIDI controller 24. In normal subcode error correction operation, 1
If a subcode error of up to two subcode symbols is detected during the backing, it can be corrected.

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.

As a main routine, the processor in the MIDI controller 24 processes the contents of the note-on message when the MIDr signal is output from the MIDI controller 23 and if it is a signal indicating a note-on message. A certain channel, note number, and velocity are written in the RAM 25, and if it is a note-off message, the contents of the note-on message corresponding to the note-off message are erased from the RAM 25.

Apart from this main routine, an interrupt routine is processed for each subcode frame synchronization signal in the subcode signal supplied from the interface 17, and first, as shown in FIG. 4, the subcode signal after the subcode frame synchronization signal is processed. is read (step S1), and it is determined whether or not the subcode frame is a subcode synchronization signal (step S1).
2). If it is a subcode synchronization signal, the synchronization count value C1 is incremented by 1 (step S3), and it is determined whether the synchronization count value C1 is equal to 2 (step S4).
). If C1≠2, the water interrupt routine is terminated and the process returns to the main routine until the next subcode frame synchronization signal is supplied.

On the other hand, if the subcode frame after the subcode frame synchronization signal is a subcode symbol, the symbol count value C2 is incremented by 1 (step S5), and it is determined whether the symbol count value C2 is greater than 96 (step S5). S6). If C2≦96, the water interrupt routine is terminated and the process returns to the main routine until the next subcode frame synchronization signal is supplied.

As mentioned above, the subcode signal consists of two consecutive subcode frames SFO and SFO each consisting of a subcode synchronization signal.
F1 and 96 subcode frames SF2 .F1 and 96 subcode frames consisting of subcode symbols SF2. ... Group 5F97 is formed in one subcode block. Therefore, in step S4, 01
If it is -2, two subcode synchronization signals have been obtained as a subcode block delimiter, so it is determined whether the symbol count value C2 is equal to 96 by symbol counting in step S5 (step S7). In the case of C2-96, the supplied subcode signal has a predetermined number (98) of subcode frames, so the synchronization count value C1 and symbol count value C2 are reset to 0.
(steps S8 and S9).

However, in the case of C2≠96, the supplied subcode signal is divided into a predetermined number of subcode frames, that is, 96
Since it does not have a subcode symbol, it is assumed that a subcode error has occurred. Further, in step S6, C2
If >96, it is impossible for symbol count value C2 to exceed 96 within one subcode block, so it is assumed that a subcode error has occurred.

When this error occurs, it is determined whether a note-on message has been written in the note-on map of the RAM 25 (step 511).

If a note-on message has been written, read the contents of the note-on message and create a corresponding note-off message.Step 5
12) MIDI the created note-off message
The data is added to the ID and supplied to the output buffer in the MIDI controller 24 for output to the MIDI device 26 (step 513). Furthermore, the contents of the note-on message are erased from the note-on map in the RAM 25 (step 514). After executing step S14, the RAM 25
In step 515), it is determined whether any other note-on messages have been written.
If a message has been written, the process advances to step 512 and repeats the above operation, and if there are no other note-on messages, the process returns to the main routine. Each note-off message provided to the MIDI device 26 causes the sound produced by the corresponding note-on message to cease. Note that a note-off message corresponding to a note-on message has the same channel and note number. Also,
The note-off message is the readout note-on message.
Either add velocity to the message channel and note number with a predetermined value (for example, 00H) and create it in a predetermined format as shown in Figure 5, or set the status byte as a note-off event (8n+) and read it out. It may also be used as a note-off message using the note-on message channel, note number, and velocity. Furthermore, in the embodiment described above, when an error occurs, note-off messages corresponding to all note-on messages stored in the RAM 25 are immediately created and supplied to the MI D ItlA unit 26.
Note-on memory stored in RAM 25 at the time of error occurrence
If the message is still stored after a predetermined period of time, a note-off message corresponding to the note-on message may be created and supplied.

Therefore, the disc player tracks jump.

If the sub-chord signal is not supplied in the correct data format due to discontinuous performance such as trace errors or noise, please send a note-off message from the instrument performance program that supports the note-on message. If a note-off message is missing, a note-off message is created and forcibly supplied to the MIDI device, making it possible to avoid the problem of the sound source not stopping.

Note that in the above embodiment, a single MIDI device is connected to the MIDI control device, but multiple
It is also possible to connect an I device, and the present invention can be applied to this case as well.

Furthermore, the present invention is not limited to disk players, but can be used, for example, to perform search, pause, and stop operations of a recording medium performance device such as a tape deck that plays a magnetic tape on which a musical instrument performance program is recorded. You can also do that.

Furthermore, the present invention is applicable not only to the case of missing note-off messages, but also to the case of missing signals for resetting control off messages for stopping other control operations such as modulation channel pressure, pitch bend hold, press control, etc. Can be applied.

As described in detail, according to the present invention, the contents of the operation-on signal on the MIDI ID generated by the sub-code decoder by decoding the sub-code signal from the recording medium performance device are decoded into the corresponding operation. At least until the off signal is generated from the subcode decoder, it is stored, and the number of subcode symbols is counted for each subcode block of the subcode signal.
When the count value in the subcode block becomes a value other than the predetermined value, an operation off signal corresponding to the contents of the stored operation on signal is supplied to the MIDI device, so that track jumps, etc. of the recording medium performance device can be avoided. MID in case of discontinuous performance, trace error or noise
This prevents problems such as non-stop sound from the I-device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing one subcode block of a subcode signal, FIG. 3 is a diagram for explaining a configuration example of subcode data, and FIG.
The figure is a flowchart showing the control operation of the MIDI controller, and FIG. 5 is a diagram showing an example of the configuration of the MIDI controller.
FIGS. 6A and 6B are diagrams for explaining the generation timing of note-on messages and note-off messages. Explanation of symbols of main parts 7...Disk controller 22...Subcode error correction circuit 23...MIDIID-da 24...MIDI controller

Claims (2)

[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 at least until an operation off signal corresponding to the subcode decoder is generated; and a storage means for counting the number of subcode symbols for each subcode block of the subcode signal and counting the number of subcode symbols in the one subcode block. When the numerical value becomes a value other than a predetermined value, an operation OFF signal corresponding to the contents of the operation ON signal stored in the storage means is transmitted to the MI.
A MIDI control device comprising a forced release means for supplying a signal to a DI device. (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 including an IDI control means, a subcode decoder that decodes the subcode signal to generate a MIDI signal including the operation on signal and the operation off signal, and the operation on signal generated by the subcode decoder. storage means for storing at least the contents of the subcode decoder until a corresponding operation off signal is generated from the subcode decoder; and a storage means for counting the number of subcode symbols for each subcode block of the subcode signal, and forced release means for supplying to the MIDI device an operation-off signal corresponding to the content of the operation-on signal stored in the storage means when the counted value in the storage means becomes a value other than a predetermined value. MIDI system.