Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-02-28
1990-06-05
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358147, H04N 704, H04N 7087
Patent
active
049318705
ABSTRACT:
A teletext decoder includes a background or buffer memory operating as a first-in, first-out (FIFO) memory. The buffer memory is used for storing a large number of teletext pages. A given video line that contains teletext information is identified as such by the detection of part of a clock run-in sequence followed by the framing code. The video line is then stored in the background memory. After a user page request occurs, the background memory is read-out by a data processor operating in a full channel mode of operation for obtaining the information of the requested page. As long as the read-out operation has not been terminated, incoming teletext data is stored in the background memory. This enables teletext data received prior to termination of the read-out operation to be read out and processed by the data processor.
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Henig Sammy S.
Laks Joseph J.
Parker Michael D.
RCA Licensing Corporation
Shepperd John W.
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