Audio signal muting circuit for magnetic recording and reproduci

Details Audio signal muting circuit for magnetic recording and reproduci Audio signal muting circuit for magnetic recording and reproduci

1981-09-01

1983-09-06

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Record editing

360 30, 360 381, G11B 1502, G11B 504

Patent

active

044032625

ABSTRACT:
In an apparatus for recording a frequency modulated audio signal and a frequency modulated video signal on the frequency multiplex basis onto the same recording track, a muting circuit is necessary so that the reproduced audio signal is not outputted when a dropout takes place and/or when the frequency modulated audio signal is missing on the track. The muting circuit is controlled not only by the output signal of a dropout detector, but by a signal obtained by integrating the dropout detection signal so that the audio output is blocked during a frequent occurrence of dropout. The muting circuit includes a previous value holding circuit serving to hold its output at an input level immediately before the control signal has been given, the previous value holding circuit being arranged in the reproduction audio signal processing system following a demodulator.

REFERENCES:
patent: 4146099 (1979-03-01), Matsushime et al.
patent: 4309726 (1982-01-01), Tanaka et al.
patent: 4321618 (1982-03-01), Hivose et al.

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