Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-12-13
1989-09-19
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, H04N 704
Patent
active
048686581
ABSTRACT:
A multiplexer for compressing two television programs into the bandwidth normally required for a single television signal is disclosed wherein vertically adjacent lines in the odd and even field of each frame are summed and differenced in pairs having the same color subcarrier phase. "Line pair signals" respectively comprising the sum and difference of each line pair are then formed after the difference signal is time compressed without an overall increase in bandwdth. The line pair signals for each frame of one program are alternately transmitted with the line pair signals of a frame from the second program. The line pair signals of a video frame are fewer in number and longer in duration than NTSC field lines. Timing is such that one frame of both programs is transmitted during the time allotted to the transmission of one frame under the NTSC standard. The lines from odd fields of each program are reconstructed after transmission by adding the appropriate difference signals and sum signals. The lines from even fields are reconstructed by differencing the sum signals and the difference signals.
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"Comband--GE's New Bandwidth Compression System"; GE Brochure.
"Time-Frequency Multiplexing (TFM) of Two NTFC Color TV Signals-Simulation Results"; B. G. Haskell; Bell System Technical Journal, vol. 60, No. 5, May-Jun., 1981.
"Transmission of Two NTSC Color Television Signals Over a Single Satellite Transponder Via Time-Frequency Multiplexing"; R. L. Schmidt; Copyright 1982 IEEE.
Coleman Guy B.
Henderson James W.
Sacks Jack
Groody James J.
Harvey David E.
Multilink Group
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