Cable television system with stereo sound reproduction

Facsimile and static presentation processing – Static presentation processing – Attribute control

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Details

358120, 358121, H04N 710, H04N 7167

Patent

active

046033491

ABSTRACT:
A cable television converter is retrofitted for use in reproducing stereophonic broadcast television sound. A composite signal is produced comprising the scrambled output signal from the converter tuner, the reception enable control signal from the converter's digital processor, and the output signal from the converter's remote control detection circuit. The composite signal is applied to a stereo adapter which separates the audio signal portion of the composite signal into left and right stereo signals, extracts the enable control signal from the composite signal, and outputs the left and right stereo signals for audio reproduction upon authorization indicated by the extracted enable control signal. Remote volume control and selection of a second audio program (SAP) is also provided.

REFERENCES:
patent: 4095258 (1978-06-01), Sperber
patent: 4145717 (1979-03-01), Guif et al.
patent: 4163252 (1979-07-01), Mistry et al.
patent: 4405944 (1983-09-01), Eilers et al.
patent: 4410911 (1983-10-01), Field et al.
patent: 4471379 (1984-09-01), Stephens
patent: 4471380 (1984-09-01), Mobley
patent: 4494142 (1985-01-01), Mistry
patent: 4536791 (1985-08-01), Campbell et al.
Eilers et al, "Television Multichannel Sound Broadcasting-A Proposal" IEEE Transactions on Communications, vol. CE-27, No. 3, Aug. 1981, pp. 398-409.
Gordon, "Stereo Unready-Why Your Cable Box Is Hopelessly Mono-tonous", Video magazine, Dec. 1984, vol. VIII, No. 9, pp. 117-118, 188-190.

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