Digital aft system which is activated during vertical retrace in

Details Digital aft system which is activated during vertical retrace in Digital aft system which is activated during vertical retrace in

1982-09-01

1984-11-27

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 550

Patent

active

044854048

ABSTRACT:
A digital fine tuning system for a television receiver includes a counter arrangement for measuring the frequency of the IF picture carrier by counting cycles of the IF picture carrier during a measurement interval and comparing the count at the end of the measurement interval to a predetermined count related to the nominal frequency of the IF picture carrier. To prevent counting, and thereby frequency measurement errors, due to the overmodulation of the picture carrier during image intervals, the frequency measurement operation is enabled during a predetermined portion of the vertical retrace interval when the picture carrier is not overmodulated.

REFERENCES:
patent: 3821650 (1974-06-01), Kase et al.
patent: 3940554 (1976-02-01), Masuda
patent: 4077008 (1978-02-01), Rast et al.
patent: 4078212 (1978-03-01), Rast
patent: 4236182 (1980-11-01), Minoura et al.
patent: 4305157 (1981-12-01), Mogi
patent: 4358791 (1982-11-01), French
patent: 4388650 (1983-06-01), Schmidtmann
patent: 4442547 (1984-04-01), Tults
Abstract of a talk entitled "Modern Techniques of FLL Tuning", by D. Vazirani and F. Sutaria, IEEE International Conference on Consumer Electronics, Jun. 10, 1982, pp. 124-125.
U.S. Ser. No. 242,619, now U.S. Pat. No. 4,352,206, by F. Aschwanden entitled Frequency Comparison Arrangement for a Digital Tuning System (now allowed).
P. 96 of the book entitled "Color Television: Theory and Serving", Clyde N. Herrick, Reston Pub. Company, Reston, Virginia, 1977.
P. 246 of the book entitled "Microelectronic Circuits", Adel S. Sedra & Kenneth C. Smith, CBC College Pub. Co., NY, 1982.

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