Carrier acquisition by applying substitute pilot to a synchronou

Details Carrier acquisition by applying substitute pilot to a synchronou Carrier acquisition by applying substitute pilot to a synchronou

1993-12-29

1995-04-25

Groody, James J.

Television

Receiver circuitry

Demodulator

348638, 348505, 455260, H04N 966, H04N 5455

Patent

active

054103681

ABSTRACT:
A synchronous demodulator is controlled by a phase locked loop for tuning to a pilot in a television signal. A start-up interval is commenced upon initiation of tuning (either after power-up or a channel change) during which a substitute signal at the pilot frequency is supplied to the phase locked loop to rapidly bring the VCO close to its lock-up frequency. Thereafter the IF signal is supplied. The start-up interval is defined by an AFC Defeat signal from a microprocessor and controls an IF switch. The substitute signal is from a crystal oscillator.

REFERENCES:
patent: 3644853 (1972-02-01), Ma
patent: 4443769 (1984-04-01), Aschwanden et al.
patent: 4939790 (1990-07-01), Sgrignoli
patent: 5105273 (1992-04-01), Ayakutake

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