Television receiver for terrestrial broadcasting

Details Television receiver for terrestrial broadcasting Television receiver for terrestrial broadcasting

1993-06-03

1995-03-14

Kostak, Victor R.

Television

Receiver circuitry

Automatic frequency control

4551822, H04N 550

Patent

active

053980808

ABSTRACT:
In a television receiver in which image frequency signals for desired signals are removed when television broadcasting signals are frequency-converted through a local oscillator and mixers, the local oscillator generates biaxial orthogonal signals to be frequency-converted by respective mixers, an output signal of one mixer being phase-shifted to be added to an output signal of the other mixer so as to thereby offset only the image frequency signals. The local oscillator and a phase shifter operate so as to follow the frequency change of the intermediate frequency signal so as to thereby stabilize the suppression of the image frequency signal.

REFERENCES:
patent: 4581643 (1986-04-01), Carlson
patent: 4718113 (1988-01-01), Rother et al.
patent: 5214795 (1993-05-01), Suter
patent: 5233425 (1993-08-01), Rabii

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