Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-05-07
1986-09-09
George, Keith E.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 86, H04N 7167, H04N 710
Patent
active
046112421
ABSTRACT:
A cable television system capable of decoding signals encoded in two different formats, A and B. Format A is identified by digital data on horizontal lines 10-13 in the vertical blanking interval and format B by digital data on horizontal lines 14-17 in the vertical blanking interval. Logic circuitry receives the vertical blanking interval data and supplies one pulse marking the beginning of the vertical blanking interval and an identifier pulse derived from digital data on horizontal lines 13 or 17. A format mode control switch includes a monostable timing circuit producing an output responsive to the vertical blanking interval pulse for a period terminating at approximately horizontal line 14. The timing circuit output is supplied along with the identifier pulse to the inputs of a flipflop for determining which of the decoders A and B is to be energized.
REFERENCES:
patent: 4322745 (1982-03-01), Saeki et al.
patent: 4405942 (1983-09-01), Block et al.
patent: 4460922 (1984-07-01), Ensinger et al.
patent: 4536791 (1985-08-01), Campbell et al.
patent: 4554579 (1985-11-01), Citta
George Keith E.
Zenith Electronics Corporation
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