JPH07101346B2 - MIDI controller and MIDI system - Google Patents

Description

TECHNICAL FIELD The present invention relates to MIDI (Musiacal Intrument Digital Interfa
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 information exchange by 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, subcodes are recorded on disks such as CDs (compact disks), CD-Vs (videos), LDs (laser disks) including CD format digital audio, and tapes such as DATs. 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, and various applications such as graphics, voice, and images have been studied, and a standard for a graphic format has already been proposed.

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, the MIDI device has converted the MIDI format signals sequentially supplied from the disc player into serial signals.
The performance is performed in accordance with the musical instrument playing program formed by the MIDI signal. However, if the disc player receives an operation accompanied by a track jump while supplying the musical instrument playing program, the musical instrument playing program continues. The musical instrument playing program cannot be read in the order of writing, and the continuity of the musical instrument playing program is broken. As a result, problems such as the sound from the sound source of the MIDI device may not stop may occur.

The reason will be described in detail below.

First, the MIDI control signal supplied to the MIDI device is the transfer rate.
It is serial data of 31.25 [Kbaud], and a total of 10 bits, that is, 8-bit data, 1-bit start bit and 1-bit stop bit, constitutes 1-byte data.

Also, a message as music information is formed by combining at least one status byte for designating the type of data to be sent and a MIDI channel and one or two data bytes guided by the status. 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.

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

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. 6 (A). The note number of data byte 1 designates one of 128 steps assigned to the keyboard centering on the "center C" of the 88-key piano. 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. By receiving the note-off message, the MIDI device operates in the same manner as, for example, releasing the keyboard of the keyboard.

By the way, as shown in FIG. 6 (B), after a note-on message is sent to the sound source 1 and before a note-off message is sent, a track jump performance state such as a manual search or a track search occurs. If there is a trace error from the player or noise is mixed in, the musical instrument playing program based on the MIDI signal, which should proceed continuously with the passage of time, is partially lost or the program stops. As a result, a problem such as sound source 1 in which sound generation does not stop due to a missing note-off message occurs. In particular, when there are 10 sound sources and they are played simultaneously at the same time, it is difficult to deal with such a problem.

Such a problem is not limited to the case where the note-off message is lost, and the same applies to the case where the control operation such as the modulation channel pressure, the pitch bend hold, and the breath control has to be stopped.

SUMMARY OF THE INVENTION [Object of the Invention] An object of the present invention is to suppress the occurrence of a defect due to a missing musical instrument playing program when a track jump performance state occurs, or when a player's trace error or noise is mixed. A possible MIDI control device and a MIDI system including the same.

[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 for decoding 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 Storage means for storing at least until generated by the subcode decoder, and the number of subcode symbols is counted for each subcode block of the subcode signal, and the count value in one subcode block becomes a value other than a predetermined value. When the operation-off signal corresponding to the content of the operation-on signal stored in the storage means is supplied to the MIDI device, the forced release means is provided. It is characterized by that.

The MIDI system according to 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. Yes, there is a subcode decoder that combines the subcode signals to generate a MIDI signal including an operation on signal and an operation off signal, and an operation off signal that corresponds to the content of the operation on signal generated by the subcode decoder. Storage means for storing at least until the generation of the subcode signal, and the storage means when the number of subcode symbols is counted for each subcode block of the subcode signal and the count value in one subcode block becomes a value other than a predetermined value. And forcibly releasing the operation off signal corresponding to the content of the operation on signal stored in the MIDI device to the MIDI device. It has a feature.

Examples Hereinafter, examples 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. The signal stored in 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 portion control circuit 5 is configured to drive the spindle motor 2 and the carriage motor 4 in accordance with a command from the brake control 7, on / off control of various servo systems (not shown), and jump control.

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 display device 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.

On the other hand, R, S, T, U, V of the subcode that is the user's bit
Subcode signal including W channel is interface 17
Is transmitted to the reception / decoding circuit 21 of the MIDI control device as a serial signal via. The sub-code signal forms one sub-code block in sub-code frames SF0, SF1, SF2, ... SF97 as shown in FIG. 2, and sub-code frames SF0, SF1
Consists of subcode synchronization signals (S0, S1), subcode frame SF2, ... SF97 is subcode symbol (P, Q, R, S,
T, U, V, W channels). This symbol is 1 in 24
One data format (1 pack) is formed. Therefore, one subcode block transmits 4 packs.
The subcode data obtained from the output of the reception / decoding circuit 21 is supplied to the subcode error correction circuit 22 to perform subcode error correction. Where R, S, T, U, V, W of subcode
FIG. 3 shows an example of the data format configuration by channel. In FIG. 3, 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, MIDI data is expressed as mode → 011, item → 000. Symbol 1 is in instruction mode, and 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 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 sindroll 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, it is a subcode decoder that takes in this and decodes it into a MIDI signal. The obtained MIDI signal is supplied to the MIDI device 26 via the MIDI controller 24.

The MIDI controller 24 is composed of a microcomputer, etc., and when the MIDI signal supplied as described later is an operation ON signal such as a note on message, it is written in the external RAM 25 and the supplied MIDI signal is Note·
When it is an operation off signal such as an off message, the corresponding operation on signal is erased from the RAM 25.

Further, the subcode error correction circuit 22 determines that the subcode error correction is impossible if three or more subcode errors are detected in one pack (24 subcode symbols) during subcode error detection. MI Unauthorized Signal
It is designed to output to the DI controller 24.
In a normal subcode error correction operation, when a subcode error of up to 2 subcode symbols is detected in one pack, it can be corrected.

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.

The processor in the MIDI controller 24, as a main routine, outputs a note-on message when a MIDI signal is output from the MIDI decoder 23. The number and velocity are written in RAM25, and if it is a note-off message, the content of the note-on message corresponding to the note-off message is deleted from RAM25.

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. It is read (step S1), and it is determined whether or not the subcode frame is a subcode synchronization signal (step S2). 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, this 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 larger than 96 (step S6). If C2 ≦ 96, this interrupt routine is terminated and the process returns to the may routine until the next subcode frame synchronization signal is supplied.

As described above, the sub-code signal is composed of two consecutive sub-code frames SF0 and SF1 each including the sub-code synchronization signal.
, And 96 sub-code frames SF2, ..., SF97 consisting of sub-code symbols are formed by one sub-code block. Therefore, if C1 = 2 in step S4, two subcode synchronization signals have been obtained as the delimiters of the subcode block, so it is determined by the symbol counting in step S5 whether the symbol count value C2 is equal to 96 (step
S7). When C2 = 96, since the supplied subcode signal has a predetermined number (98) of subcode frames, the sync count value C1 and the symbol count value C2 are reset to be equal to 0 (step S8, S9).

However, if C2 ≠ 96, the supplied subcode signal does not have a predetermined number of subcode frames, that is, 96 subcode symbols, and therefore it is considered that a subcode error has occurred. If C2> 96 in step S6, the symbol count value C2 cannot exceed 96 in one subcode block, so it is considered that a subcode error has occurred.

When this error occurs, it is determined whether or not a note-on message is written in the note-on map of RAM 25 (step S11). If an auto-on message has been written, the content of the note-on message is read out and a corresponding note-off message is created (step S12), and the created note-off message is used as a MIDI signal. The data is supplied to the output buffer in the MIDI controller 24 and output to the MIDI device 26 (step S13). Also, the content of the note-on message is deleted from the note-on map of RAM 25 (step S14). After executing step S14, it is determined whether or not another note-on message is written in the RAM 25 (step S15). If another note-on message is written, the process proceeds to step S12 and Repeat the above operation, and if there is no other note-on message, return to the main routine. By supplying each note-off message to the MIDI device 26, the sounding generated by the corresponding note-on message is stopped.
Note that the note-off message corresponding to the note-on message means that the channel and the note number are the same. In addition, note-off message has the velocity of the read note-on message channel and note number set to a specified value (for example, 00
_H ) and create it in the specified format as shown in Fig. 5, or add the status byte to the note-off event (8n
_H )), and the note-off message may be obtained by using the channel, note number and velocity of the note-on message read out from it. Further, in the above embodiment, when an error occurs, a note-on message corresponding to all the note-on messages stored in the RAM 25 is immediately created and supplied to the MIDI device 26. If the stored note-on message has been stored after the specified time, the note-off message corresponding to that note-on message will be stored.
A message may be created and supplied.

Therefore, if the disc player is in a discontinuous playing state such as a track jump, a trace error or noise is mixed in, and the subcode signal cannot be supplied in the correct data format, the instrument corresponding to the note-on message is generated. Even if the note-off message is missing from the performance program, the note-off message is created and forcibly supplied to the MIDI device, so the problem that the sound source does not stop sounding can be avoided. .

In the above example, a single MIDI device
Although connected to the DI 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 is used, for example, when performing search, pause and stop operations of a recording medium playing device such as a tape deck playing a magnetic tape on which a musical instrument playing program is played. You can also do it.

Furthermore, the present invention is not limited to the case where the note-off message is lost but the case where the signal for resetting the control-off message for stopping the control operation such as other modulation channel pressure, pitch bend hold, breath control, etc. is also lost. Can be applied.

As described above, according to the present invention, the operation off signal corresponding to the content of the operation on signal as the MIDI signal generated by the subcode decoder by decoding the subcode signal from the recording medium playing device is described. When a signal is stored at least until it is generated by the subcode decoder, the number of subcode symbols is counted for each subcode block of the subcode signal, and the count value in one subcode block becomes a predetermined value city value. Since the operation OFF signal corresponding to the stored contents of the operation ON signal is supplied to the MIDI device, the MIDI device can be used when the recording medium playing device has a discontinuous playing condition such as a track jump or a trace error or noise is mixed. It is possible to prevent the occurrence of troubles such as the pronunciation of the sound not stopping.

[Brief description 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.
FIG. 5 is a flow chart showing the control operation of the MIDI controller, FIG. 5 is a diagram showing an example of the structure of a MIDI message, and FIGS. 6 (A) and 6 (B) are the timings at which note-on messages and note-off messages are generated. It is a figure for explaining. Explanation of main part code 7 …… Disk controller 22 …… Subcode error correction circuit 23 …… MIDI decoder 24 …… MIDI controller

Claims (2)

[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 Storage means for storing at least until generation, and counting the number of subcode symbols for each subcode block of the serve code signal, and when the count value in the one subcode block becomes a value other than a predetermined value, A forced release 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, MIDI controller characterized by comprising. 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, wherein a subcode decoder which 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 until the operation off signal corresponding thereto is generated from the sub-code decoder, and the number of sub-code symbols is counted for each sub-code block of the sub-code signal. And a forced release 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 when the count value of the other becomes a value other than a predetermined value. MIDI system.