Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-11-09
1992-02-11
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 83, 358186, 358188, 358 31, 455295, 455 63, 375 18, 375103, H04N 5260, H04N 544, H04N 978, H04N 700
Patent
active
050879758
ABSTRACT:
A television signal transmission signal comprises a suppressed carrier, VSB signal having respective Nyquist slopes at the lower and upper edges of a 6 MHz television channel, the center frequency of the Nyquist slope at the lower edge of the channel being substantially coincident with the frequency of the suppressed carrier, and a pilot signal in quadrature relation with the suppressed carrier. The suppressed carrier is modulated by an N-level digitally encoded signal having a sample rate fs substantially equal to three times the NTSC color subcarrier frequency, with the frequency of the color subcarrier being less than the co-channel NTSC picture carrier by an amount equal to about fs/12. The received signal is demodulated by a synchronous detector in response to the received pilot signal and interfering NTSC beat components are attenuated by a linear filter having notches at fs/12, 5fs/12 and fs/2. The output of the filter comprises an M-level signal, where M is greater than N, which is converted to a N-level output signal representing the televised image.
REFERENCES:
patent: 3706843 (1972-12-01), Laub
patent: 4115811 (1978-09-01), Goff
patent: 4216496 (1980-08-01), Lothian et al.
patent: 4343019 (1982-08-01), Lagoni
patent: 4558352 (1985-12-01), Sauer
patent: 4602278 (1986-07-01), Pritchard et al.
patent: 4951146 (1990-08-01), Citta
Citta Richard W.
Mutzabaugh Dennis M.
Sgrignoli Gary J.
Peng John K.
Zenith Electronics Corporation
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