Method and apparatus for monitoring modulation devices for video

Details Method and apparatus for monitoring modulation devices for video Method and apparatus for monitoring modulation devices for video

1975-05-19

1976-12-14

Griffin, Robert L.

325133, H04B 1700

Patent

active

039978427

ABSTRACT:
A method for monitoring modulation devices for video signals includes the transmission of a selected carrier portion for carrier recovery. The carrier portion is produced at the input of a modulation device by removing the direct voltage contained in the video signal. A predetermined direct voltage is then injected and the direct voltage obtained at the output of a demodulation device is fed to a monitoring device to determine breakdown of a transmission assembly, or the direct voltage signal, or an out of phase condition between the modulation and demodulation devices.

REFERENCES:
patent: 2699494 (1955-01-01), Albricht
patent: 3337804 (1967-08-01), Palatinus
patent: 3396240 (1968-08-01), Abbey et al.

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