Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-03-26
1991-03-26
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
355146, 355147, H04N 708, H04N 7087
Patent
active
050033905
ABSTRACT:
The present invention is directed to the implementation of a reliable data communications system using the horizontal scan lines of video signals, and is particularly concerned with the minimization of problems which are caused as a result of false acquisition of horizontal scan lines and missed or dropped lines. In accordance with the present invention, a two-tier approach to receiving data transmitted via television signals is used. The two-tier approach includes a search mode and a lock mode. The present system operates on the principle that if a horizontal scan line (or lines) has been perfectly identified to contain data for successive fields of a video signal, then this scan line (or lines) can be presumed to be a valid data bearing scan line (or lines) in fields of the video signal yet to be received. The lock mode is then utilized to favor the retrieval of what would otherwise be missed or dropped horizontal scan lines were the system operating in the more restrictive search mode.
REFERENCES:
patent: 4577227 (1986-03-01), Gurumurthy
patent: 4606029 (1986-08-01), Nagao et al.
patent: 4638497 (1987-01-01), Komatsu et al.
patent: 4709376 (1987-11-01), Kage
patent: 4891703 (1990-01-01), Noudan
Helgert Hermann J.
Posner William
Richer Mark S.
EEG Enterprises, Inc.
Parker Michael D.
PBSE Enterprises, Inc.
Shepperd John W.
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