AGC system with overriding, maximum gain during an initial interval to enhance signal acquisition
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United States of America Patent
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Aug 13, 1996
Issued Date -
N/A
app pub date -
Oct 11, 1994
filing date -
Dec 29, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
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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