Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-07-01
1993-12-14
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, 358167, H04N 700
Patent
active
052708160
ABSTRACT:
A hybrid television signal of less transmission power or better signal to noise performance is made up by removing low frequency analog components from the video signal, digitizing them and sending them as data in non-active video portions of the transmitted signal. A two step hybridization process, with the first step removing the line averaged value of the video components of the video signal and the second step removing the remainder of the video components under 200 KHz, is described. Temporal filtering, signal preemphasis, compression, time dispersion and double sideband suppressed carrier modulation about a centered carrier are disclosed for reducing peak signal amplitudes and for minimizing co-channel interference to and from NTSC signals. Time dispersion is done horizontally, vertically or both to reduce the peak signal amplitudes. Time dispersion in conjunction with low frequency removal and temporal filtering is preferred. Time dispersing lower frequencies more than higher frequencies contributes to an optimized video display. For cochannel NTSC signals, frame locking the hybrid signal to the NTSC co-channel "hides" the data in the hybrid in the NTSC vertical interval. The hybrid signal system is uniquely adapted to a high definition television signal in a limited frequency channel with an NTSC signal.
REFERENCES:
patent: 2437300 (1948-03-01), Labin
patent: 4631574 (1986-12-01), LoCicero et al.
patent: 4800426 (1989-01-01), Glenn
Citta Richard W.
Lee Ronald B.
Groody James J.
Harvey David E.
Zenith Electronics Corporation
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