Satellite broadcasting tuner

Details Satellite broadcasting tuner Satellite broadcasting tuner

1991-08-13

1992-07-14

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581951, 358198, 4551641, 4551821, H04N 550

Patent

active

051308037

ABSTRACT:
A satellite broadcasting tuner by use of which high-definition television broadcasting of a satellite broadcasting channel can be received in a high quality. The satellite broadcasting tuner receives a satellite broadcasting channel selected by a channel selecting microcomputer, and when frame synchronizing data of the high-definition television system are detected from within audio data of the received channel, the reception frequency for the channel is fixed to receive the high-definition television broadcasting, but when no such frame synchronizing data are detected, an ordinary automatic fine tuning function operates to receive the satellite broadcasting channel. Changing over circuit is provided to take, when such frame synchronizing data are detected, a keyed automatic frequency control pulse signal into the channel selecting microcomputer from an external MUSE decoder to which video data of the received channel are transmitted so that the channel selecting microcomputer may perform a keyed automatic fine tuning operation.

REFERENCES:
patent: 4748684 (1988-05-01), Wright
patent: 4941050 (1990-07-01), Bird
patent: 4975775 (1990-12-01), Satoh
patent: 5014350 (1991-05-01), Nezu

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