Reflected modulated television system

Details Reflected modulated television system Reflected modulated television system

1993-09-20

1994-10-18

Chin, Tommy P.

Television

Bandwidth reduction system

Format type

348423, 348436, 348434, 348435, H04N 708

Patent

active

053572831

ABSTRACT:
A television system, the composite color television signal (E.sub.M (t)) whereof is generated using reflected modulated signals (E.sub.3 (t)), wherein at the transmitting side video signals (E.sub.1-1 (t), E.sub.1-2 (t)) are used to quadrature modulate subcarriers at the zero and .+-.(.pi./2) phases, thereby generating folded-band signals (E.sub.3 (t)) at subcarrier frequencies selected such as to provide the required phase shifts of the subcarriers in adjacent lines of one frame and in identically numbered lines of adjacent frames. The thus generated folded-band signals are transmitted during time intervals allocated for them in the composite color television signal (E.sub.M (t)). At the receiving side, separating messages of folded-band signals (E.sub.3 (t)) out of the received composite color television signal (E.sub.M (t)) and delaying these messages in delay units (11) for time intervals constituting multiples of the television scan. The process then involves multiplying the delayed and undelayed messages by harmonic signals (U.sub.1 (t), U.sub.2 (t)) in multipliers (12.sub.1, 12.sub.2), algebraically summing the products in adder (13), and separating the modulating video signals (E.sub.1-1 (t), E.sub.1-2 (t)) out of the resulting signals.

REFERENCES:
patent: 4622578 (1986-11-01), Rzeszewski
patent: 4630099 (1986-12-01), Rzeszewski
An HDTV Broadcasting System Utilizing a Bandwidth Compression Technique-MUSE, by Yuichi Ninomiya, et al., NHK (Japan Broadcasting Corp.) Science and Technical Research Lab. IEEE Transactions On Broadcasting, vol. BC-33, No. 4, Dec. 1987.
Report 1074-Satellite Transmission Of Multiplexed Analogue Component (MAC) Vision Signals, pp. 82-98, 1986.
Electronics (Russian), vol. 56, No. 14, pp. 82-84, 1983.

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