JPS59204891A - Multiplex recording of sound performed by music synthesizer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of multiplex recording performance sounds using a music synthesizer.

First, an overview of the configuration of a conventional music synthesizer will be explained with reference to FIG.

Reference numeral 1 denotes a voltage-controlled oscillator (VCO), which generates a musical tone signal S of a scale (treble) according to a control voltage CV generated in response to a key pressed from the keyboard section 2.

This musical tone signal S is filtered by a voltage-controlled filter (VC
A tone color and an envelope are formed by F) 4 and an amplifier (VCA) 5, amplified by an amplifier 6, and produced by a speaker 7 as a performance sound.

In order to multiplex record the performance sounds of such a music synthesizer using a tape recorder, first record the first performance, and then play back the first performance sound while playing a new performance the second time. Record the sound again. In many cases, such operations are repeated to perform multiple recording.

By the way, when performing multiple recording in this way, there is no problem if the tape speed of the tape recorder is always constant, but the tape speed often changes between the first and second recording. Sometimes, then,
There is a problem in that the pitches of multiple overdubbed performance sounds will be different, resulting in disordered chords.

The present invention has been made to solve these problems, and it is an object of the present invention to prevent the pitches of each overdubbed performance sound from shifting, thereby eliminating disturbances in chords.

Therefore, the present invention records a reference signal of a constant frequency on a track other than the track for recording the performance sound of the recording tape before or at the same time as recording the performance sound of the music synthesizer with the tape recorder, and then records the reference signal of a constant frequency on the track other than the track for recording the performance sound. During sound recording, while playing back the previously recorded reference signal, the phase difference between the reproduced signal and the reference signal is detected, and the oscillation frequency of the music synthesizer's scale generation oscillator (VCO) is controlled according to the phase difference. To provide a multi-recording method of performance sounds using a music synthesizer, which matches the pitch of the reproduced sound of a previously recorded performance sound and the performance sound to be newly played.

Hereinafter, as an embodiment of the present invention, a music synthesizer equipped with a device for carrying out the multiplex recording method according to the present invention will be described with reference to FIG.

In Figure 2, numeral 10 is a tape recorder equipped with a multi-recording function, and the part 11 surrounded by a broken line is a new device added to the music synthesizer, and the other parts are the same as in Figure 1. , the explanation thereof will be omitted.

12 is a reference signal generator, which always generates a reference signal a with a constant frequency.
oscillates and outputs. 13 is a phase detection circuit that detects the phase difference between the reproduction signal reproduced from the tape recorder 10 and the reference signal a from the reference signal generator 12, and outputs a voltage signal Vc according to the phase difference. Since this voltage signal Vc is a pulsating current, the alternating current is removed by the low-pass filter 14 and applied to the VCO 1 as a control voltage for pitch adjustment.

Therefore, in order to multiplex-record the performance sound produced by this music synthesizer using the tape recorder 10, first,
Before recording the performance sound or at the same time as recording the performance sound for the first time, a reference signal a generated by a reference signal generator 12 is recorded on one track other than the performance sound recording track of the recording tape.

Thereafter, when recording the performance sound from the music synthesizer, the tape recorder 10 always plays back the previously recorded reference signal, and the phase detection circuit 1!
Enter in l.

Thereby, the phase detection circuit 13 detects the phase difference between the reproduced signal and the reference signal a, and outputs the voltage signal Vc. To automatically adjust the pitch of the reproduced performance sound and the newly played performance sound to match.

In this way, even if the tape speed of the tape recorder changes slightly during multi-recording of performance sounds using a music synthesizer, the oscillation of vcol will always match the pitch of the playback sound of the previously recorded performance sound. Since the pitch of the frequency is adjusted, there is no possibility of chord disturbance.

As explained above, according to the method of multiplex recording performance sounds using a music synthesizer according to the present invention, even if the tape speed of the tape recorder changes slightly during multiple recording, the pitch shift between the reproduced sound and the new performance sound will occur. This eliminates the possibility of chord disturbances caused by

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an outline of the configuration of a conventional music synthesizer, and FIG. 2 is a block diagram showing an embodiment of this invention. 1... Voltage controlled oscillator (vCO) 2... Keyboard section 1o... Tape recorder 12... Reference signal generator 16... Phase detection circuit 14... Low-pass filter

Claims (1)

[Claims] 1 In a multi-recording method in which a performer using a music synthesizer is recorded using a tape recorder, and the recorded performance sound is played back and recorded again with new performance sounds, the performer using a music synthesizer is recorded before or at the beginning of the tape recorder. At the same time, a reference signal of a certain frequency is recorded on a track other than the one for recording the performance sound on the recording tape, and when recording the performance sound thereafter, while playing back the previously recorded reference signal, that playback signal and the above reference signal are recorded. The oscillation frequency of the scale generation oscillator of the music synthesizer is controlled according to the phase difference between the playback sound of the previously recorded performance sound and the pitch of the newly performed performer. A multi-recording method of performance sounds using a music synthesizer, characterized by combining the following.