Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-09-08
1980-11-04
Tupper, Robert S.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358149, H04N 506, H04N 504
Patent
active
042323398
ABSTRACT:
A circuit for communicating both a video signal and a timing signal over a single information channel from a television camera head to a remote camera control unit. A horizontal interval timing signal is modified by delaying the beginning of each timing pulse so that each pulse is shortened in duration by a fixed amount. This modified timing signal is added to a video signal such that the portion of the sum signal which corresponds to the modified timing signal has a distinctive amplitude which is outside of the range of amplitudes established by the white and black levels of the video signal. At the camera control unit, a circuit separates the modified timing signal from the sum signal and synchronizes a multi-phase oscillator therewith through use of a phase locked loop. The original timing and video signals are reconstructed through logical operations which use selected phases of the oscillator.
REFERENCES:
patent: 3526714 (1970-09-01), Fisk et al.
patent: 3688037 (1972-08-01), Ipn
patent: 3688316 (1972-06-01), Moskovitz
patent: 3816658 (1974-06-01), Vidovic
patent: 3963877 (1976-06-01), Miyazaki et al.
Smiley Charles F.
Zachum Billy G.
Harris Corporation
Psitos Aristotelis M.
Tupper Robert S.
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