Windowed tuning system with synchronous detector

Details Windowed tuning system with synchronous detector Windowed tuning system with synchronous detector

1977-12-14

1979-07-31

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358195, H04N 544, H04N 550

Patent

active

041632591

ABSTRACT:
A television receiver includes automatic fine tuning, synchronous detection, and a "window" type tuning system. The synchronous detector has a detector oscillator which is tunable to the nominal frequency of an intermediate frequency signal derived from a received television signal. For fine tuning control, a frequency comparator receives the outputs of a fixed frequency reference oscillator and the synchronous detector oscillator and develops a control signal for locking the tuner to the frequency of a received television signal.

REFERENCES:
patent: 3867568 (1975-02-01), Merriweather
patent: 3961266 (1976-06-01), Tanaka
patent: 4077008 (1978-02-01), Rast et al.
National Cable Television Association:Annual Convention:Jun. 1970, Phase Lock Applications in CATV Systems; Switzer.

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