Methods and arrangements for changing the audio information in a

Details Methods and arrangements for changing the audio information in a Methods and arrangements for changing the audio information in a

1981-11-02

1984-10-23

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358145, 358147, 358343, H04N 9491

Patent

active

044791500

ABSTRACT:
The invention relates to methods and circuit arrangements for changing the audio information in an audio/video recording/reproduction system and particularly in a color video system wherein the audio signals are inserted as sampling pulses of a time-multiplex system into the color video signal and particularly into a blanking interval of the signal and the recorded original audio signal is overwritten by a new audio signal. In preference the horizontal blanking interval of the video signal is used for this purpose, and in the case of a color video signal the color burst is displaced to the bottom of the horizontal blanking interval in order to free the back porch of the horizontal blanking interval for the audio signal. The circuit arrangements according to the invention contain corresponding circuit units which are suitably matched to the measures of the methd. The invention can be preferably used for color video systems without losing recording capacity on the recording medium.

REFERENCES:
patent: 3723637 (1973-03-01), Fujio et al.
patent: 4246615 (1981-01-01), Shiraishi et al.
patent: 4303950 (1981-12-01), Taniguchi et al.

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