JP2969783B2 - Performance information transceiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a performance information transmitting apparatus and a performance information receiving apparatus for transmitting and receiving performance information via ISDN (Integrated Services Digital Network). "Prior art" MIDI as a communication standard for performance information between electronic musical instruments
(Music Instrument Digital Interface) standard has been established. Currently available electronic musical instruments have a MIDI transmitting / receiving function, that is, a function of transmitting performance information such as keyboard performance as a 31.25 kbps asynchronous serial signal (hereinafter, referred to as a MIDI signal) conforming to the MIDI standard, and other electronic musical instruments. Many of them have a function of receiving a MIDI signal output by a musical instrument and controlling sound generation of a sound source and the like in accordance with the received MIDI signal. According to the electronic musical instrument having such a MIDI transmission / reception function, performance information can be exchanged between the electronic musical instruments, so that simultaneous performance of a plurality of electronic musical instruments can be performed, and the performance effect can be enhanced. . There is also a device that edits and stores MIDI information, such as a MIDI sequencer. Using this type of device, it is also possible to automatically play an electronic musical instrument based on edited MIDI information. "Problems to be Solved by the Invention" By the way, it is becoming difficult for busy musicians to perform together with other musicians in one place.
In this case, if MIDI signals are exchanged between electronic musical instruments owned by each musician, each musician can drive the musical instrument by MIDI signals from other musicians. Can be played with other musicians. However, although communication by MIDI signals is possible as described above, the communicable range is at most 10 m, and after all, the performers cannot perform unless they gather at one place. The present invention has been made in view of the circumstances described above,
It is intended to provide a performance information transmitting / receiving apparatus for transmitting / receiving a DI signal to / from a remote location via ISDN, thereby enabling communication and performance between electronic musical instruments located at a remote location. is there. [Means for Solving the Problems] The first invention is to convert the captured 31.25 kbps MIDI signal into three.
A first rate converter for converting the signal to an intermediate rate of 2 kbps; and a second rate converter for multiplexing the two intermediate rate signals of 32 kbps converted by the first rate converter and converting the multiplexed signal to a signal of 64 kbps corresponding to the ISDN B channel. A two-speed conversion unit; a transmission unit for transmitting the 64 kbps signal converted by the second speed conversion unit to the ISDN as a B-channel signal; a reception unit for receiving a B-channel signal from the ISDN; A third speed converter for converting the B-channel signal into two 32 kbps intermediate speed signals, and converting the 32 kbps intermediate speed signal converted by the third speed converter to a 31.25 kbps MIDI signal for output Fourth
A performance information transmitting / receiving device comprising: a speed conversion unit; A second invention provides a simultaneous performance system wherein the performance information transmitting and receiving apparatuses according to the first invention are interconnected by ISDN to enable simultaneous performance. According to a third invention, in the first invention or the second invention, when the signal converted by the conversion unit is not a MIDI signal, the first speed conversion unit converts the signal into a control signal for ISDN. Meaningless, and
There is provided a performance information transmitting / receiving apparatus having a conversion function of converting a special code signal having no meaning as performance information. [Operation] According to the first to third aspects of the present invention, it is possible to exchange performance information via ISDN. It can be performed. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a MIDI transmitting / receiving apparatus 18 according to a first embodiment of the present invention and a remote simultaneous performance system constituted by using the same.

[Overview of Remote Simultaneous Performance System]

In FIG. 1, each element in the dashed line frame indicated by reference sign A is arranged at point A, and each element in the dashed line frame indicated by reference sign B is located at point B far away from point A. Are located. At point A, Clavinova 11, electronic drum 12, synthesizer 13, mixer 14, amplifier
15, speaker 16L and 16R, telephone 17, according to this embodiment
A MIDI transmitting / receiving device 18 and a digital service unit (DSU) are arranged. In the MIDI transmitting / receiving device 18, 3181 kbps of each MIDI supplied from the Clavinova 11 or the electronic drum 12
This is a first speed converter that receives signals, removes unnecessary start bits and stop bits, temporarily stores the signals, and outputs the stored digital signals at a speed of 32 kbps. 18
Reference numeral 2 denotes a second speed conversion unit that converts each digital signal (32 kbps) output from the first speed conversion unit 181 into a bit rate corresponding to ISDN, that is, 64 kbps, multiplexes and outputs the multiplexed signal as a B channel signal. . Reference numeral 183 denotes an S / T interface for interfacing with the exchange. 185 is B received via the S / T interface.
A third speed conversion unit 186 that outputs the channel signal at a bit rate of 32 kbps accumulates the output signal of the third speed conversion unit 185, reads out the stored data, adds a start bit and a stop bit, and This is a fourth speed converter that serially outputs as a MIDI signal. Between the S / T interface 183 and the ISDN side, transmission and reception of control information using a D channel is performed via a DSU (Digital Service Unit). Then, the S / T interface 183
By controlling the output of the B channel signal in the second speed converter 182 and the capture of the B channel signal in the third speed converter 183 based on the channel control information, the signal between the MIDI transmitting / receiving device 18 and the ISDN side is controlled. Is given and received. Clavinova 11, electronic drum 12, and MIDI transceiver
Each MIDI signal output from the fourth speed conversion unit 186 in 18 is sent to each sounding channel of the synthesizer 13, and sounding control corresponding to each MIDI signal is performed in each sounding channel. Then, the musical sound waveforms formed by the respective sound channels are mixed by the mixer 14, D / A (digital / analog) converted, amplified by the amplifier 15, sent to the speakers 16 L, 16 R, and the musical sounds are reproduced. Pronounced. On the other hand, at point B, a piano player 21 and a rhythm instrument 2
2, sound source unit 23, mixer 24, amplifier 25, speaker 26
A MIDI transmitting / receiving device 27, a telephone set 28 and a DSU having the same configuration as those installed at the points L, 26R and A are arranged. To start the remote simultaneous performance, the player at the point A calls the telephone 28 at the point B with the telephone 17. And
Talk with the performer at point B. Then, the performance is started at the points A and B in response to the telephone voice. Each output from Clavinova 11 and electronic drum 12
The MIDI signal is converted to a bit rate corresponding to ISDN by passing through a first speed conversion unit 181 and a second speed conversion unit of the MIDI transmission / reception device, and the S / T interface 183 and the DSU
Via ISDN. The signal transmitted from the point A to the ISDN is received by the MIDI transmitting / receiving device 27 via the DSU at the point B. Then, in the MIDI transmitting / receiving device 27, a start bit and a stop bit are added to the received signal, the MIDI signal is reproduced, and supplied to the sound source unit 23. In the sound source unit 23, the channel of the received MIDI signal is determined, the tone generation control is performed by the received MIDI signal in the corresponding tone generation channel, and the musical tone waveform formed in the tone generation channel is transmitted to the speaker 26L via the mixer 24 and the amplifier 25. , 26R, and a musical tone is generated. In this way, the sound source unit 23 at the point B is driven by the MIDI signal output from the Clavinova 11 and the electronic drum 12 at the point A, and a musical tone is generated. On the other hand, when the player at the point B plays the piano player 21 and the rhythm instrument 22, MIDI signals generated by the piano player 21 and the rhythm instrument 22 are taken into a MIDI transmitting / receiving device and converted into a signal format conforming to ISDN as described above. , Via DSU, I
Sent to SDN. Then, the signal transmitted from point B is the DSU at point A.
Is received by the MIDI transmission / reception device 18. And MIDI
Through the third speed converter 185 and the fourth speed converter 186 in the transmitting / receiving device 18, the MIDI signal is reproduced,
The signal is supplied to the synthesizer 13. As a result, a musical tone corresponding to the performance of the piano player 21 and the rhythm instrument 22 at the point B is generated from the speakers 16L and 16R at the point A.

[Second Embodiment of MIDI Transmitting and Receiving Apparatus] In the first embodiment, the MIDI signal is transmitted and received by once converting the data to the intermediate speed (32 kbps). No speed conversion is performed,
The signal to be transmitted is time-division multiplexed as it is. FIG. 2 shows a specific configuration example of a MIDI transmitting / receiving apparatus according to a second embodiment of the present invention. In FIG. 1, reference numeral 101 denotes a CPU (Central Processing Unit) for controlling the operation of the entire apparatus, and has a built-in DMA (Direct Memory Access) controller. 102 is a ROM (read only memory) storing a control program executed by the CPU 101, and 103 is a RAM (random access memory) for temporary storage. 104 is a timer, and 105 is an interrupt controller. These are provided to enable specific processing to be performed at fixed time intervals. That is, such a specific process is executed by giving an interrupt request from the timer 104 to the CPU 101 via the interrupt controller 105 every time a predetermined time elapses. 106
Is an I interface that mediates the exchange of frames between the apparatus and the ISDN via the DSU. Reference numeral 107 denotes a dual port RAM (bidirectional random access memory) used for temporarily storing performance information to be transmitted and temporarily storing received performance information. The above components are interconnected via a bus BA. 108 is a B channel communication interface for controlling frame transmission and frame reception in the I interface 106, 109 is a processor interface, and 110 is a control register shared by the B channel communication interface 108 and the processor interface 109. 111 is a MIDI port, the MID input from the electronic musical instrument
A serial / parallel conversion unit which takes in the I signal, converts the start bit and the stop bit into an 8-bit parallel digital signal, and outputs the digital signal to a bus BB;
It comprises a parallel / serial converter that takes in the digital signal output to the BB, adds a start bit and a stop bit, and serially outputs as a MIDI signal. 112 is a bus interface, a dual port RAM
The process of reading performance information from 107 and transferring it to MIDI port 11 via bus BB,
Digital information output to the dual port
A write process is performed as performance information to be transmitted to the RAM 107. Hereinafter, the operation of the MIDI transmitting / receiving device will be described. Unnecessary start bits and stop bits are removed from the MIDI signal sent from the electronic musical instrument by the MIDI port 111 and output to the bus BB as 8-bit parallel performance information. Then, the performance information on the bus BB is written into the transmission data area in the dual port RAM 107 by the bus interface 109. Also, control information indicating that a MIDI signal has been input is sent from the bus interface 112 to the processor interface 109, and the control information is written into the control register 110 by the processor interface 109. As a result, the B-channel communication interface 108 uses HDLC (high-level data link).
Start flag, address part,
The control unit generates a frame check sequence and an end flag, and supplies them to the I interface 106. Then, a DMA request is given to the CPU 1 from the I interface 106, and the performance information stored in the transmission data area of the dual port RAM 107 is DMA-transferred to the I interface 106 via the DMA controller in the CPU 1. And I
An HDLC frame having performance information as an I frame is assembled by the interface 106, and is sent to the DSU in synchronization with a frame cycle in ISDN. On the other hand, when an HDLC frame having performance information as an I frame is received by the I interface 106 via the DSU, a DMA request is given from the I interface 106 to the CPU 101, and the I frame, that is, the performance information is transmitted through the DMA controller. Is written to the reception data area of the dual port RAM 107. In this case, the I interface 106
Is controlled by the B-channel interface 108, and control information indicating that there has been reception is written in the control register 110. As a result, a command to capture performance information is sent from the processor interface 109 to the bus interface 112. Then, the performance information in the reception data area of the dual port RAM 107 is read out by the bus interface 112 and sent to the MIDI port 111,
The performance information is converted to MIDI signals and sent to the electronic musical instrument.

[Third Embodiment of MIDI Transceiver] FIG. 3 shows a configuration example of a MIDI transceiver according to a third embodiment of the present invention. In this figure, when a MIDI signal is supplied from the electronic musical instrument, the switch SW is switched to the contact a side. Then, the I interface 106 sends the MIDI signal including the start bit and the stop bit to ISDN as it is. On the other hand, electronic musical instruments
When the DI signal is not supplied, the switch SW is switched to the contact b side, and a signal generating circuit (not shown) repeats a code (FE) H which has no meaning for ISDN and has no meaning as performance information. A signal is generated. As a result, this serial signal (FE) H
Is sent to ISDN. That is, as shown in FIG.
While there is no MIDI signal, a serial signal (FE) H is transmitted to ISDN. Then, the I frame received by the I interface 106 from ISDN is supplied to the electronic musical instrument as a MIDI signal as it is. In this case, the signal (FE) H is supplied to the electronic musical instrument during a period in which the MIDI signal is interrupted, but since this signal has no meaning as performance information, the performance is performed normally. In the above-described embodiment, the case where the MIDI signal is transmitted bidirectionally has been described, but the transmission may be unidirectional. For example, as an application of the present invention, a service is conceivable in which a MIDI signal generated when a leading performer plays an electronic musical instrument is sent to the electronic musical instrument at each home via ISDN. in this case,
At each home, you can listen to the performers' live performances while at home, and if you wish, you can also co-star with top performers at home. That is, the music provided by each home is incomparably more realistic than music supplied by media such as radio and television. [Effects of the Invention] As described above, according to the present invention, communication between electronic musical instruments through ISDN becomes possible, and even if a performer in a remote place does not meet with all of the performers, There is an effect that the performance can be enjoyed.

[Brief description of the drawings]

FIG. 1 is a MIDI transmitting and receiving apparatus according to a first embodiment of the present invention;
And FIG. 2 is a block diagram showing a configuration of a MIDI transmitting / receiving apparatus according to a second embodiment of the present invention, and FIG. 3 is a block diagram showing the configuration of a MIDI transmitting / receiving apparatus according to a third embodiment of the present invention. FIG. 4 is a time chart for explaining the operation of the embodiment. 18 MIDI transmitting / receiving device, 181 first speed converter, 182
... A second speed converter, 183... A third speed converter, 184... A fourth speed converter.

Claims (3)

(57) [Claims] (1) An M code having a bit rate of 31.25 kbps.
A first speed converter for converting an IDI signal into an intermediate speed of 32 kbps; and multiplexing the two intermediate speed signals of 32 kbps converted by the first speed converter to correspond to the ISDN B channel.
A second speed converter for converting the signal into a 64 kbps signal, transmitting means for transmitting the 64 kbps signal converted by the second speed converter to the ISDN as a B channel signal, and receiving means for receiving a B channel signal from the ISDN And the B channel signal received by the receiving means is 2
A third speed converter for converting and outputting two 32 kbps intermediate speed signals, and a fourth speed converter for converting the 32 kbps intermediate speed signal converted by the third speed converter to a MIDI signal having a bit rate of 31.25 kbps And a performance information transmitting and receiving device comprising: 2. The simultaneous performance system according to claim 1, wherein the performance information transmission / reception devices are connected to each other by ISDN to enable simultaneous performance. 3. The first speed converter, when the signal converted by the converter is not a MIDI signal having a bit rate of 31.25 kbps, the signal has no control meaning for ISDN, and 3. The performance information transmitting / receiving device according to claim 1, further comprising a conversion function of converting the performance information into a special code signal having no meaning.