Teletext set-top converter with transparent mode

Details Teletext set-top converter with transparent mode Teletext set-top converter with transparent mode

1983-03-28

1985-07-30

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 21R, H04N 932

Patent

active

045325405

ABSTRACT:
A set-top teletext converter decodes the chroma burst signal of a color television signal with the substantially same amplitude and phase as the burst in the television signal. The teletext signal along with its transparent mode signal are decoded. The decoded teletext signal is then re-encoded as a standard television signal using the decoded burst signal. When switching between the encoded teletext signal and the regular television signal under the control of the transparent mode signal, no color shift is present.

REFERENCES:
patent: 4288809 (1981-09-01), Yabe
patent: 4346407 (1982-08-01), Baer et al.
patent: 4388639 (1983-07-01), Cox et al.
Set-Top Adapter Considerations for Teletext, IEEE Transaction on Consumer Electronics, vol. CE-25, No. 3, pp. 393-398.
Service Notes for Sears Model 5430 Telecaption Decoder.

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