AFT Lockout prevention system

Details AFT Lockout prevention system AFT Lockout prevention system

1981-06-01

1983-06-14

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581931, 455183, 455260, H04N 550

Patent

active

043886493

ABSTRACT:
Television receiver employs a synchronous video detector system, and includes an AFT detector responsive to carrier waves supplied by reference amplifier of synchronous detector system. A peak detector, independent of the synchronous video detector and the receiver's automatic gain control system, is responsive to the output of the receiver's IF amplifier, and supplies an output to a voltage comparator. When the comparison indicates the IF output swing exceeds a threshold value, the AFT detector is disabled to avoid an AFT "lockout" condition.

REFERENCES:
patent: 3715495 (1973-02-01), Takezaki et al.
patent: 3949158 (1976-04-01), Rzeszewski
patent: 4031549 (1977-06-01), Rast
patent: 4100578 (1978-07-01), Arneson
patent: 4128849 (1978-12-01), Rhee
patent: 4261016 (1981-04-01), Hongu
patent: 4263611 (1981-04-01), Gibson
patent: 4358791 (1982-11-01), French
TDA 2540 and TDA 2541-New Vision IF ICs, Technical Information 034, Philips Electronic Components and Materials, 11/3/77.

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