Teletext decoder apparatus including feature of inhibiting gener

Details Teletext decoder apparatus including feature of inhibiting gener Teletext decoder apparatus including feature of inhibiting gener

1991-01-28

1993-02-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358146, H04N 7087, H04N 704, H04N 708

Patent

active

051842203

ABSTRACT:
A "correct page header received" (CPHR) flip-flop (3) is set by the page header of a required teletext page and reset by the next following page header, a "page end" flip-flop (15) generates a page end output (17) in response to the receipt of the next following page header, a "row received" flip-flop (11) detects at least one row of the required teletext page, a gate (14) inhibits the generation of an end of page output (21) for a predetermined period, typically corresponding to three field intervals, and an AND gate (18) further inhibits the generation of an end of page output (21) if there has been a subsequent detection of a further page header of the required teletext page within the predetermined period.

REFERENCES:
patent: 4701794 (1987-10-01), Froling et al.
patent: 4991018 (1991-02-01), Davies
"Specification of Standards for Broadcast Teletext Signals", Teletext Specification, IBA Technical Reviews, pp. 76-89, Sep. 1976.
"Computer Controlled Teletext User's Manual", Mullard Application Laboratory, 1983 Nov. 01.

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