JPH05224669A - Signal synthesizer / separator - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to display accompanying data such as explanations, lyrics, and still images along with the music. [Configuration] A timing signal detection unit 11 inputs a MIDI signal via a signal line 20, detects a timing signal from the MIDI signal, and outputs the timing signal to a processing device 40 via a signal line 30. The data signal synthesis unit 13 adds an identification code to the data signal input from the processing device 40 via the signal line 32 in synchronization with the timing signal, and synthesizes the data signal with the MIDI signal input from the signal line 22. Data signal separation unit 12
Inputs the composite signal of the MIDI signal and the data signal from the signal line 21, detects the identification code, removes the identification code,
The subsequent 8-bit data signal is output to the processing device 40 via the signal line 31.

Description

Detailed Description of the Invention

[0001]

The present invention relates to MIDI (Musical I
nstrument Digital Interface) The present invention relates to a device that transmits a data signal such as lyrics, a musical score, or a still image in synchronization with a signal.

[0002]

2. Description of the Related Art MIDI is a standard that defines a common code for exchanging musical performance information among a plurality of devices. This interface operates in asynchronous serial transmission at 31.25 kbps. Performance information consists of the type of instrument, program change information that specifies the tone color, key information that indicates how to play the keyboard, and the performance can be reproduced by inputting it to a MIDI device such as an electronic musical instrument or tone generator module. it can.

[0003]

When musical instruments and lyrics are displayed in synchronism with the performance, the switching of the data to be displayed is independent of the timing of the device being played.
It must be performed by a clock, and if the clock accuracy is low, a synchronization shift occurs due to long-time performance. Further, it is not easy to start the display together with the start of the performance.

Further, in MIDI, it is possible to easily change the performance speed before or during performance, but it is extremely difficult to perform display corresponding to such a function.

An object of the present invention is to provide a signal synthesizing / separating device capable of displaying attached data such as commentary, lyrics and still images in accordance with music.

[0006]

A signal synthesizing / separating device of the present invention receives a MIDI signal, inputs a timing signal detecting section for detecting a timing signal from the MIDI signal, and externally inputs the timing signal in synchronization with the timing signal. When a data signal synthesizing unit for synthesizing the input MIDI signal with a data identification code is added to the data signal to be generated and a synthetic signal in which the MIDI signal and the data signal are synthesized, and the data identification code is detected, And a data signal separation unit that separates the subsequent data signal from the combined signal.

[0007]

The data signal is synthesized in synchronism with the timing signal included in the MIDI signal, and the synthesized signal is used to separate the MIDI signal and the data signal during playback so that they can be played and displayed at the same time. It becomes possible to synchronously reproduce data such as.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a signal synthesizing / separating apparatus according to an embodiment of the present invention, and FIG. 2 is a flow chart showing the operation of the timing signal detecting section 11.

The signal synthesizing / separating apparatus 10 comprises a timing signal detecting section 11, a data signal separating section 12 and a data signal synthesizing section 13.

The timing signal detector 11 includes a signal line 20.
MIDI transmitted serially via the
As shown in FIG. 2, a signal is input, and from the MIDI signal bit string, a start (hexadecimal character string FA), a stop (hexadecimal character string FC), and a continue (hexadecimal character) are selected from among MIDI system standard real-time messages. Character string FB), timing clock (hexadecimal character string F8)
Of each of the above timing signals is detected and transmitted to the external processing device 40 via the signal line 30. At this time, the signal input from the signal line 20 is directly transmitted to the data signal separation unit 12 via the signal line 21. When the data signal is not included in the signal, it is further transmitted to the data signal synthesis unit 13 via the signal line 22.

The processing unit 40 synchronizes the data with the signal line 3 in synchronization with the timing signal supplied via the signal line 30.
It is supplied to the data signal synthesizing unit 13 via 2. Eg 4
If you insert data at the beginning of the 3rd bar of a / 4 beat song,
The processing unit 40 increments the timing counter to 0 when it receives the start signal, and increments the timing counter each time it receives the timing clock. timing·
Since 24 clocks are sent per quarter note, when the value of the timing counter is 24 × 4 × 2 = 192, the third clock is output.
Since it is known that the measure has been entered, the processor 40 outputs the data to the data signal synthesizer 13. As a result, the data is inserted at the correct timing. That is, the processing unit 40 advances the sequence by the timing clock sent after the start signal. As described above, the timing clock is sent at a rate of 24 per quarter note, and the tempo of the performance can be accurately known. Then, the processing device 40 can know the progress state of the music by these timing signals, and can insert the data such as the score and the lyrics into the correct position of the MIDI signal. The stop signal is a signal that stops counting by the timing counter, and the continue signal is a signal that restarts counting by the timing counter.

The data signal synthesizing section 13 gives an identification signal to the received data and inputs MI from the signal line 22.
It is inserted in the non-signal section of the DI signal and output from the signal line 23. As a method of giving the identification code, there are a method of using a code not defined in the MIDI standard and a method of using a system exclusive message. Further, there are a method of adding a code indicating the length of data to an identification code and transmitting variable length data, and a method of adding an identification signal every 8 bits and transmitting fixed length data. When the undefined code is used as the identification code and the fixed length data of 8 bits is transmitted, the data signal synthesizing unit 13 sets an undefined code for every 8 bits to the signal input through the signal line 32, for example, 16 bits.
After transmitting the base character string F4 to the signal line 23, the 8-bit data is transmitted.

When separating the data signal from the composite signal,
The data signal separation unit 12 is used. The signal input from the signal line 20 is input to the data signal separation unit 12 via the signal line 21 as it is. Data signal separation unit 12
Detects a data identification signal from the bit string. Similarly to the above, when an undefined code, for example, hexadecimal character string F4 is used as the identification signal and fixed length data is used, the combined signal is directly used as the signal line 22 until the hexadecimal character string F4 is detected in the signal string.
Output to. When the hexadecimal character string F4 is detected, the hexadecimal character string F4 is removed, the following 8-bit data is received, and this data is supplied to the processing device 40 via the signal line 31 without being output to the signal line 22.

FIG. 3 is a block diagram showing an example of use of the signal synthesizing / separating device. The signal synthesizer / separator 2 includes a musical instrument 1
And the input device 6 is connected. The MIDI signal output from the musical instrument 1 and the explanation, lyrics, still image, etc. of the music output from the input device 6 in accordance with this MIDI signal are synthesized by the signal synthesis / separation device 2, and a public communication line or a dedicated communication line, etc. Is input to the signal synthesizer / separator 4 on the output side via the transmission medium 3. Signal synthesizer / separator 4
Separates the MIDI signal and the data signal from the input signal sequence and outputs them to the sound source 5 and the output device 7, respectively.
As a result, the musical performance information input by the musical instrument 1 is generated by the sound source 5.
It is possible to display accompanying data such as commentary, lyrics and still images on the output device in accordance with the music.

[0016]

As described above, the present invention is based on MIDI.
The data signal is synthesized in synchronization with the timing signal included in the signal, and the synthesized signal is used to separate the MIDI signal and the data signal at the same time during playback so that they can be played and displayed at the same time. This has the effect of enabling synchronized playback.

[Brief description of drawings]

FIG. 1 is a block diagram of a signal synthesizing / separating apparatus according to an exemplary embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the timing signal detection section 11.

FIG. 3 is a block diagram showing an example of use of the signal synthesizing / separating apparatus of the present invention.

[Explanation of symbols]

 1 musical instrument 2, 4 signal synthesizer / separator 3 transmission medium 5 sound source 6 input device 7 output device 10 signal synthesizer / separator 11 timing signal detector 12 data signal separator 13 data signal synthesizer 20, 21, 22, 23 signal Line 30, 31, 32 Signal line 40 Processor

Claims (1)

[Claims] 1. A timing signal detecting section for inputting a MIDI signal and detecting a timing signal from the MIDI signal, and a data identification code is added to a data signal input from the outside in synchronization with the timing signal and input. MID
A data signal combining section for combining with the I signal, and a data signal separating section for inputting the combined signal in which the MIDI signal and the data signal are combined and detecting the data identification code, and separating the subsequent data signal from the combined signal Signal synthesizer / separator having