Canal+ decoder switching circuit for video cassette recorders

Details Canal+ decoder switching circuit for video cassette recorders Canal+ decoder switching circuit for video cassette recorders

1989-08-07

1991-02-19

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

H04N 7167

Patent

active

049950797

ABSTRACT:
A canal+ decoder switching circuit for video cassette recorders which can enable a canal+ decoder for receiving a canal+ broadcast to be automatically switched to a VCR or to a TV when VCR mode or TV mode is selected respectively. The circuit includes a switch control circuit proving four kinds of control signals by combining a control signal output from the canal+ decoder, a canal+ channel designation signal and a VCR/TV mode switching signal provided by a microcomputer. The circuit also includes four kinds of switches and the states of their contacts are determined by the control signals provided by the switch control circuit respectively so that the canal+ broadcast can be televiewed not only in VCR mode but in TV mode without the necessity of manual connection of the canal+ decoder.

REFERENCES:
patent: 4731837 (1988-03-01), Gautier
patent: 4817142 (1989-03-01), Rassel
patent: 4916736 (1990-04-01), Ryan
patent: 4924498 (1990-05-01), Farmer et al.
patent: 4945564 (1990-07-01), Christian et al.

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