Television receiver including a tuning circuit which comprises a

Details Television receiver including a tuning circuit which comprises a Television receiver including a tuning circuit which comprises a

1989-07-10

1991-03-26

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581911, 455182, 455192, 455165, H04N 550

Patent

active

050033972

ABSTRACT:
In a television receiver including a frequency synthesis circuit (33) controlled by a phase detection circuit (21), in which an adjustable frequency divider (15) receives a tuning datum which is corrigible by means of an AFC circuit (119, 129), a synchronous video signal detector (57) with a reference signal oscillator (97) are used, while the AFC detector is a counter (119) which is coupled via a measuring gate (115) to an output (99) of the reference signal oscillator, and the measuring gate (115) is operatd by a measuring gate signal having an accurate periodicity being derived from a received television signal, so that a minimum possible number of terminals on an integrated circuit is sufficient.

REFERENCES:
patent: 4240115 (1980-12-01), Kamiya
patent: 4305157 (1981-12-01), Miogi
patent: 4408349 (1983-10-01), Yukawa
patent: 4485404 (1984-11-01), Tults
patent: 4543614 (1985-09-01), Chen
patent: 4556988 (1985-12-01), Yoshisato
patent: 4689685 (1987-08-01), Testin et al.
patent: 4727591 (1988-02-01), Manlove
patent: 4776038 (1988-10-01), Testin et al.
patent: 4811096 (1989-03-01), Gakumura
patent: 4817195 (1989-03-01), Kubo et al.
patent: 4843636 (1989-06-01), Hendriks et al.
patent: 4919640 (1990-04-01), Yanagibori

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