Direct data tuner

Details Direct data tuner Direct data tuner

1996-04-12

1998-04-21

Burgess, Glenton B.

Television

Receiver circuitry

Tuning

348726, 348473, H04N 550

Patent

active

057423571

ABSTRACT:
An improved tuner for recovery of data having a data bandwidth embedded in a video signal transmitted in association with a video carrier frequency is disclosed. The entire video signal is shifted to the intermediate frequency bandwidth, thereby shifting the data bandwidth to an IF data bandwidth. The IF data bandwidth is then filtered to block as much of the spectrum of the IF signal that is outside of the IF data bandwidth. The filtered IF data bandwidth is then demodulated again using an IF carrier generated by a local oscillator that tracks frequency drift in the carrier.

REFERENCES:
patent: 5311318 (1994-05-01), Dobrovolny
patent: 5327237 (1994-07-01), Gerdes et al.
patent: 5387941 (1995-02-01), Montgomery et al.
patent: 5410360 (1995-04-01), Montgomery et al.
patent: 5572264 (1996-11-01), Mizukami et al.
patent: 5621471 (1997-04-01), Kim et al.

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