Sound control signal detecting circuit for satellite broadcastin

Details Sound control signal detecting circuit for satellite broadcastin Sound control signal detecting circuit for satellite broadcastin

1991-08-14

1993-06-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 720

Patent

active

052204308

ABSTRACT:
A sound control signal detecting circuit for a satellite broadcasting signals comprises a detecting portion for detecting control bits by carrying out shiftings for a predetermined number of times after the pulse code modulation sound signals are provided and a majority logic deciding portion for providing A/B mode signals, first and second TV sound signals, and first and second extra sound signals after verifying whether a certain state of relevant bits is maintained over a predetermined number of times in a plurality of frames so that a precise decoding operation can be accomplished. The detecting portion comprises a first shift register, a second shift register, and a first control signal generating section. The majority logic deciding portion comprises a period converting section, a state judging section, a second control signal generating section and a latch section.

REFERENCES:
patent: 4691236 (1987-09-01), Kanno et al.

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