Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-11-09
1981-06-30
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 10, 455 9, H04N 762, H04N 962
Patent
active
042765641
ABSTRACT:
Apparatus for deriving a parameter indicative of the quality of parts of, or the whole of, a television system from an insertion test signal repeated at regular intervals during field blanking periods of a transmitted signal includes a sampling means for providing a digital signal representing the amplitude at a sampling position of the test signal, means for actuating the sampling means, and a computer. The computer is programmed to caculate the quality parameter from a number of the amplitude representative digital signals taken at different sampling positions by the sampling means, to provide the calculated parameter as an output, and to respond to timing origins included in the television signal to thereby control the actuating means. The actuating times are so related to the timing origins that the digital amplitude signals are provided at an average rate which is low compared with the rate at which the signals occur during a single test signal. A digital store is connected between the sampling means and the computer for storing a number of the digital amplitude signals and also for storing request signals for the amplitude signals in such a way that the sampling means is enabled to operate during a line period at a greater rate than the computer.
The digital store may be in the form of a first-in-first-out store.
REFERENCES:
patent: 3760275 (1973-09-01), Ohsawa et al.
patent: 3792195 (1974-02-01), Wilson et al.
patent: 3978282 (1976-08-01), Fulton
patent: 3997842 (1976-12-01), Pexa
patent: 4007423 (1977-02-01), Dickinson
patent: 4207431 (1980-06-01), McVoy
Dr. Ing. P. D'Amato et al., Intermodulation Distortion Measurement in TV Transposers with a Test Signal _Inserted in the Video Blanking Interval, May 13, 1970 Proceedings of the Joint Conference on T.V.
Dr. Ing. P. D'Amato and Dr. Ing. G. Barbieri, "Signal-to-Noise Ratio Automatic Measurement in the Blanking Interval of a Video Signal" _May 13, 1970 Proceeding of the Joint Conference on T.V.
Dodds Philip J.
Watson John B.
Britton Howard W.
Coles Edward L.
Independent Broadcasting Authority
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