Video signal decoder muting circuit and method of muting

Details Video signal decoder muting circuit and method of muting Video signal decoder muting circuit and method of muting

1993-10-07

1995-01-10

Groody, James J.

Television

Receiver circuitry

Sound circuit

348466, 348632, 371 572, 371 471, H04N 560

Patent

active

053811860

ABSTRACT:
A mute circuit of a MUSE decoder can remove noise produced in the changing of channels in a multi-broadcast receiver and includes a synchronizing signal comparator for comparing the audio frame synchronizing signal of a received signal with a standard frame synchronizing signal and producing a comparison result, an unequal bit number detector for receiving the comparison result and detecting the number of non-matching synchronizing bits per frame, and a mute controller for controlling a mute operation according to the detected number of non-matching synchronizing bits per frame. Also, in a method employing the above components, after having detected the number of non-matching bits of the audio frame synchronizing signal, the time for muting process is determined according to the detected number. Thus, excessive errors in a received signal and noise produced when changing channels can be removed completely.

REFERENCES:
patent: 4763339 (1988-08-01), Sutphin et al.
patent: 5170396 (1992-12-01), Rivers et al.

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