Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-09-18
1991-05-28
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358142, 358108, 358172, H04N 708
Patent
active
050199056
ABSTRACT:
A system for encoding selected signal position information from a plurality of video signal sources onto the video signals and for selecting a predetermined one of the signals for display by decoding the encoded information. The encoding portion encodes input signal position information in serial pulse form on the back porch of the respective video signal. An alphanumeric character may also be mixed into the encoded signal. A single output line provides, in sequence, the encoded video signal of each input position. The encoding portion also changes each input video signal to a zero blanking level. The encoded output signal may either be supplied directly to the decoding portion or may be recorded and played back into the decoder. The decoding portion selects a particular signal for display by decoding the encoded information and comparing it to a preset number. When this comparison indicates equality, a gating signal is provided which releases digitally stored video information related to that position to an output digital to analog converter. The output of the converter is supplied to a video monitor.
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"IEEE Standard Dictionary of Electrical and Electronics Terms", Third Edition, 1984, p. 75.
Gao Shiyang
Pshtissky Yacov
Groody James J.
Harvey David E.
Vicon Industries, Inc.
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