Video apparatus having improved antenna transfer switching syste

Details Video apparatus having improved antenna transfer switching syste Video apparatus having improved antenna transfer switching syste

1982-05-17

1984-02-14

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455133, H04N 548

Patent

active

044320159

ABSTRACT:
RF switching diodes in the antenna transfer switch of a video disc player are reverse biased by means of a bias supply when the main power supply of the player is turned off. The reverse bias counteracts any tendency for RF signals applied to the player antenna input connector from forward biasing the diodes which otherwise could result in intermodulation distortion of antenna input signals coupled to the player RF output connector. The effect of the reverse bias is augmented by a high pass filter in the antenna transfer switch which attenuates RF input signals at frequencies below the lowest assigned television channel frequency.

REFERENCES:
patent: 3860951 (1975-01-01), Camras
patent: 4097899 (1978-06-01), Yu
patent: 4361854 (1982-11-01), Wolfe
patent: 4363033 (1982-12-01), Lovely
patent: 4386377 (1983-05-01), Hunter
patent: 4400735 (1983-08-01), Strammello, Jr.

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