Digital television receiver and method of recovering...

Details Digital television receiver and method of recovering... Digital television receiver and method of recovering...

2007-05-15

2007-05-15

Kostak, Victor R. (Department: 2622)

Television

Receiver circuitry

Tuning

C375S326000, C455S258000, C455S265000, C348S725000

Reexamination Certificate

active

10710635

ABSTRACT:
A digital television receiver includes a tuner for down-converting an incoming signal to produce a down-converted signal according to a local oscillator signal corresponding to a selected channel. A filter is coupled to the tuner for filtering the down-converted signal to produce an intermediate frequency (IF) signal. A carrier recovery unit is coupled to the filter for locking to a carrier frequency of the IF signal, and a pre-shift unit is coupled to the tuner. By shifting the local oscillator signal in a first direction by a predetermined first frequency shift in a first phase of carrier recovery, and then by shifting the local oscillator signal in a second direction by a second frequency shift in a second phase of carrier recovery, the pre-shift unit ensures a pilot tone of a selected channel is not filtered from the down-converted signal by the filter.

REFERENCES:
patent: 5805242 (1998-09-01), Strolle et al.
patent: 5933200 (1999-08-01), Han
patent: 6396550 (2002-05-01), Oh
patent: 6438177 (2002-08-01), Ikeda
patent: 2003/0193365 (2003-10-01), Loheit et al.

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