Method for simultaneous teletext and analog signal transmission

Details Method for simultaneous teletext and analog signal transmission Method for simultaneous teletext and analog signal transmission

1981-06-26

1983-11-01

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358146, H04N 708

Patent

active

044132816

ABSTRACT:
Disclosed is a process for the transmission of information over television networks wherein certain information is encoded in digital form and transmitted by supplementing and/or replacing the information forming the conventional program. The digital information is received by a conventional receiving set equipped with a decoding, memory and detector means. Information is transmitted in the form of analog signals subdivided into scans or groups of scans, each scan having associated identifying material. The information transmitted in digital form has other identifying material and is transmitted generally synchronously with the corresponding information in analog form. The transmissions are received by receivers with detectors sensitive to the identifying material and which have analog-digital and inverse conversion means as well as memory and decoding means to reproduce the information contained in the analog and digital signals.

REFERENCES:
patent: 3746780 (1973-07-01), Stetten et al.
patent: 3859458 (1975-01-01), Takezawa et al.
patent: 3982065 (1976-09-01), Barnaby et al.
Darrington, "Wireless World Teletext Decoder", Wireless World, vol. 81, No. 1479, pp. 498-504, Nov. 1975.

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