Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-04-28
1986-02-25
McElheny, Jr., Donald
Facsimile and static presentation processing
Facsimile
Recording apparatus
358340, H04N 591
Patent
active
045730857
ABSTRACT:
DAXI information, recorded in the vertical interval of a video disc signal, is augmented by program data encoded in the DAXI format but inverted prior to recording and interleaved between a blank video line and a line containing a masking signal to form a triad of lines. In a video disc player the data is recovered by comb filtering the video signal. A decoder processes the DAXI signal normally for controlling operation of the player but decodes the triad of lines as a data error when the DAXI signal is anticipated or most likely to occur. Program data in each triad is recovered when the DAXI data is not anticipated or least likely to occur by inverting the program data applied to the decoder thereby eliminating the need for a separate decoder in the player for decoding the program data and providing output data for use by an external computer in an interactive application of the video disc player.
REFERENCES:
patent: 4307418 (1981-12-01), Mindel et al.
patent: 4308557 (1981-12-01), Dieterich
patent: 4309721 (1982-01-01), Christopher
patent: 4313134 (1982-01-01), Rustman et al.
Coalter R. G.
Emanuel P. M.
McElheny Jr. Donald
Rasmussen P. J.
RCA Corporation
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