Television – Plural transmitter system considerations
Patent
1994-02-09
2000-12-19
Kostak, Victor R.
Television
Plural transmitter system considerations
348608, H04N 538
Patent
active
RE0369926
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: 3946432 (1976-03-01), Goldberg et al.
patent: 4115811 (1978-09-01), Goff
patent: 4216496 (1980-08-01), Lothian et al.
patent: 4244004 (1981-01-01), Yamada
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
patent: 5121203 (1992-06-01), Citta
Quadrature Vestigial Sideband (QVSB) Data Transmission; Brian G. Henderson, Joseph A. Webb, Members, IEEE, IEEE Transactins on Communications, vol.,Com-33. No. 12, Dec. 1985.
Envelope Detection of Binary VSB Data Signals, L.J. Millott, IEEE Transactions on Communications, vol. Com-33, No. 7, Jul. 1985.
Stremler, Introduction to Communications Systems, 2.sup.nd Ed., 1982 vii-x, 122-126, 504-506, Title Page (Both Sides).
Citta Richard W.
Mutzabaugh Dennis M.
Sgrignoli Gary J.
Kostak Victor R.
Zenith Electronics Corporation
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