Economical high-definition television using a modulated-signal c

Details Economical high-definition television using a modulated-signal c Economical high-definition television using a modulated-signal c

1984-12-21

1987-02-03

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

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358 15, 358 16, H04N 1112

Patent

active

046411798

ABSTRACT:
A television (TV) system having a compatible high-definition signal receivable at conventional resolution by conventional TV receivers without auxiliary apparatus with carrier modulated high-definition luminance information being transmitted in a continuous spectrum spanning two conventional TV channels, carrier modulated quadrature amplitude modulated (QAM) high-frequency chrominance information being transmitted in the luminance spectrum and carrier modulated QAM low-frequency chrominance information being transmitted outside luminance spectrum. A decoder recovers the high-definition luminance information by demodulating the transmitted signal. The chrominance information is recovered from the transmitted signal by first notch filtering the transmitted high-definition signal to remove energy existing between the two sidebands of the QAM high-frequency chrominance information, and then, demodulating at the carrier frequency. The demodulating at the carrier frequency results in the QAM high- and low-frequency chrominance information forming a continuous spectrum that is then bandpass filtered. The high-definition I and Q chrominance signals are then recovered from the bandpass filtered chrominance information by a QAM demodulator. The QAM demodulation of the latter results in continuous high-definition I and Q chrominance signals.

REFERENCES:
patent: 2635140 (1953-04-01), Dome
patent: 4200881 (1980-04-01), Carnt et al.
patent: 4510520 (1985-04-01), Parker et al.
patent: 4521803 (1985-06-01), Gittinger
patent: 4564857 (1986-01-01), LoCicero et al.
Proceedings of the IEEE, "A Compatible High-Resolution TV System for Cablecasting", Edward W. Herold, vol. 58, No. 7, Jul., 1970, pp. 1013-1015.

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