Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-05-27
1976-12-07
Britton, Howard W.
Telegraphy
Systems
Simplex-reversing periodic
178DIG46, 325 62, 325476, 358 8, H04N 521
Patent
active
039964191
ABSTRACT:
A reference signal reflecting distortion characteristics caused by surrounding interference conditions is applied to transmitted television video or quasi-video information to effectively cancel the distortion characteristics of the incoming transmitted video information. In the event the signal distortion results from randomly occurring interference such as "airplane flutter" the reference signal may be updated periodically such as during the vertical blanking of each and every incoming television frame. This regular and periodic updating of the reference signal will serve to compensate continuously for varying interference conditions as well as compensating for fixed interference patterns. In the event the interference causing signal distortion is the result of a fixed condition, it may not be necessary to update continuously the reference signal and thus a random or manually initiated update may be acceptable.
REFERENCES:
patent: 2236134 (1941-03-01), Gloess
patent: 2310692 (1943-02-01), Hansell
patent: 3753123 (1973-08-01), Carpenter
patent: 3860952 (1975-01-01), Tallent
patent: 3935536 (1976-01-01), Kimura
Britton Howard W.
Lynch M. P.
Westinghouse Electric Corporation
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