Input/output switching circuit for connecting audio/video units

Details Input/output switching circuit for connecting audio/video units Input/output switching circuit for connecting audio/video units

1993-09-10

1994-12-20

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

348722, H04N 576, H04N 5268

Patent

active

053749944

ABSTRACT:
An input/output switching circuit comprising a first terminal provided on a first audio/video unit, a first switch coupled to the first terminal for switching an audio/video signal at the first terminal, a second terminal provided on a second audio/video unit, a connection cable coupled between the first and second terminals for bidirectional communication of the audio/video signal between the first and second audio/video units, a second switch, coupled to the second terminal for switching the audio/video signal at the second terminal, a first microcomputer coupled to the first switch for controlling the first switch, a second microcomputer coupled to the second switch for controlling the second switch, a communication line for communicating control data between the first and second microcomputers wherein the control data includes data indicating the state of the first and second switch, such that the first and second microcomputers control the first and second switches in response to the control data to accordingly provide bidirectional communication of the audio/video signal.

REFERENCES:
patent: 4496947 (1985-01-01), Nakashima et al.
patent: 4647973 (1987-03-01), Deis
patent: 4763012 (1988-08-01), Blankinship
patent: 4777503 (1988-10-01), Kramer
patent: 4821032 (1989-04-01), Shimada et al.

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