Television – Receiver circuitry – Automatic frequency control
Patent
1994-10-11
1996-08-13
Kostak, Victor R.
Television
Receiver circuitry
Automatic frequency control
348536, 348678, H04N 550, H04N 552
Patent
active
055461387
ABSTRACT:
A dual mode AGC system for a television receiver in which data is in the form of symbols occurring at a fixed symbol rate. The symbols are sent in successive data segments, each having a sync character. Enablement of an AFC Defeat signal defines an initial interval during which the IF gain is maximum. When the AFC Defeat signal becomes inactive, the receiver is operated in a non-coherent mode in which the gain of the IF amplifier is reduced incrementally whenever the IF signal exceeds a clipping level for a period of eight successive symbol clocks. Upon a segment sync lock condition occurring, a normal coherent mode is entered in which the AGC responds to a signal characteristic, i.e. data segment sync. The rate of gain change available in the non-coherent mode-is much greater than that in the normal coherent mode.
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Krishnamurthy Gopalan
Mycynek Victor G.
Sgrignoli Gary J.
Kostak Victor R.
Miller John W.
Zenith Electronics Corporation
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