Apparatus for tuning offset signals by controlling a tuner based

Details Apparatus for tuning offset signals by controlling a tuner based Apparatus for tuning offset signals by controlling a tuner based

1994-12-22

1996-09-03

Metjahic, Safet

Television

Receiver circuitry

Automatic frequency control

348732, 4551821, 4551832, 4551841, 455263, H04N 550

Patent

active

055528384

ABSTRACT:
A frequency counter obtains frequency data by measuring the frequency of an optionally offset broadcast signal tuned by a tuner having a VCO. A microprocessor is used to determine the frequency difference between the optionally offset signal and the previously tuned signal based on the frequency data measured for each signal, and controls the oscillation frequency of the VCO for the tuner based on this frequency difference using a PLL circuit. The frequency is quickly changed to tune in the optionally offset broadcast signal.

REFERENCES:
patent: 4422096 (1983-12-01), Henderson
patent: 4817195 (1989-03-01), Kubo et al.
patent: 5003397 (1991-03-01), Wink
patent: 5163164 (1992-11-01), Tults
patent: 5212554 (1993-05-01), Tults

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