Signal measurement
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United States of America Patent
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-
Feb 21, 1989
Grant Date -
N/A
app pub date -
Jul 13, 1987
filing date -
Jul 12, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for measuring the noise present in a video signal is adapted to operate on a spare line of the video field. An AGC circuit is used in which a known amount of gain is applied to the input signal and compared with the reference signal. A feedback loop includes a PROM containing data indicative of the antilog of all possible difference signals and applies the antilog data as feedback data to the gain control.
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