Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-07-25
1976-10-05
Martin, John C.
Telegraphy
Systems
Simplex-reversing periodic
178DIG23, 178 58R, H04N 708
Patent
active
039846245
ABSTRACT:
A video system having a transmitter in which a composite signal is formed by combining digital information with scanlines of an analog video signal generated by a line scanning device, and a receiver in which the digital information is recovered. The digital information is combined with the analog video signal at predetermined locations along scanlines of the video signal, and these predetermined locations are varied in order to prevent visible deterioration of the video image. In the video receiver, the digital information is recovered by examining the composite signal at the predetermined locations to extract the digital information. Each bit of digital information to be conveyed is represented by a first pseudo-random digital pulse sequence (or its complement, depending on whether the data bit is 1 or 0) which is superimposed on a selected scanline of the analog video signal to form the composite signal. The digital information is recovered at the receiver by generating a second pseudo-random digital pulse sequence in synchronism with the first sequence, and by examining the composite signal at locations determined by the second digital pulse sequence to extract the digital information contained in the composite signal.
REFERENCES:
patent: 2624797 (1953-01-01), Lawson et al.
patent: 3752907 (1973-08-01), Mazza
patent: 3838444 (1974-09-01), Loughlin et al.
patent: 3842196 (1974-10-01), Loughlin
patent: 3870828 (1975-03-01), Saliga
Kavrukov I.
Martin John C.
McMahon Kevin
Sherman William R.
Weston Instruments, Inc.
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