Video disc recording and reproducing device for video discs having recognition signal indicative of content of associated program signal
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United States of America Patent
Stats
-
Jan 14, 1986
Grant Date -
N/A
app pub date -
Jul 23, 1981
filing date -
Jul 24, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A video disc and reproducing device therefor in which a recognition signal for identifying the content of an audio program, specifically whether two recorded audio signals are in the stereophonic mode or in a split mode, is recorded along with the audio signal and a video signal. The recognition signal may be multiplexed in either a frequency division multiplex system or in a time division multiplex system. The reproducing device includes a selection switch provided for selecting whether a pair of sum and difference signals, in the stereophonic mode, or whether the first and second audio signals directly, in the case of the multiplex mode, are coupled to inputs of a modulator which outputs an RF signal adapted to be inputted to a television tuner. A pilot signal is included with the output of the modulator. The pilot signal is amplitude modulated with one of two different frequency sinewaves. The one of the sinewaves which is used to modulate the pilot signal and the selection switch is controlled by a recognition signal detector.
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