Error eliminating system for teletext

Details Error eliminating system for teletext Error eliminating system for teletext

1983-01-05

1986-09-30

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358146, 358167, H04N 7087, H04N 708

Patent

active

046149716

ABSTRACT:
A system is disclosed for eliminating error in teletext signals caused by the presence of noise accompanying the teletext signals. The system includes: (1) a teletext packet buffer which receives the teletext signal and transfers the teletext signals to a teletext decoder in the absence of noise accompanying the teletext signals; (2) a timing circuit which produces timing signals from television synchronous signals; (3) a control circuit which controls the teletext packet buffer in response to the timing signals; and (4) a noise detector which detects whether noise is present in the teletext signal and disables the teletext packet buffer to prevent the transfer of the teletext signal from the teletext packet buffer to the teletext decoder if the teletext signal was received in the presence of noise.

REFERENCES:
patent: 4052719 (1977-10-01), Hutt et al.
patent: 4202012 (1980-05-01), Hirashima
"Wireless World Teletext Decoder", by J. F. Daniels, printed in Wireless World, Feb. 1976, pp. 46-51.

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