Video subsystem for a hybrid videotex facility

Details Video subsystem for a hybrid videotex facility Video subsystem for a hybrid videotex facility

1985-02-11

1986-10-07

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358342, H04N 5222

Patent

active

046162631

ABSTRACT:
A video subsystem for a hybrid teletex facility includes a computer-based video control unit coupled to a general purpose interface bus, such as the IEEE 488, capable of parallel data transfer at the requisite rate. Appended from the bus are a plurality of microprocessor-based video cluster controllers for supervising the retrieval of selected video segments from randomly accessible storage media, i.e., video discs. The selected video segments are frequency translated through associated video modulators and thereafter coupled, under supervision of the video controller, through a video switch to selected broadcast frequency modulators. The outputs of the broadcast modulators are arranged by a video combiner into a composite NTSC video signal suitable for transmission or, for example, a CATV system.

REFERENCES:
patent: 3506965 (1970-04-01), Dowling
patent: 3627914 (1971-12-01), Davies
patent: 3894177 (1975-07-01), Howell
patent: 4271430 (1981-06-01), O'Brien

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