Method of measuring amplitude variations of a video carrier and

Details Method of measuring amplitude variations of a video carrier and Method of measuring amplitude variations of a video carrier and

1987-05-04

1988-07-26

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358156, H04N 1700, H04N 508

Patent

active

047604484

ABSTRACT:
A composite RF television signal is converted to an IF signal, passed through an AGC circuit and the amplitudes of the horizontal sync pulses are sampled only during the horizontal sync period. The high and low peak samples are stored and the difference between the levels of these peak samples, which is proportional to the HUM in the system, drives a meter calibrated to show the percent of HUM in the composite RF television signals.

REFERENCES:
patent: 3743774 (1973-07-01), Chipman et al.
patent: 3995105 (1976-11-01), Krivosheev et al.
patent: 4303939 (1981-12-01), Stephens et al.
patent: 4417268 (1983-11-01), LaSota

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