Apparatus for automatic measurement of the video-signal-to-noise

Details Apparatus for automatic measurement of the video-signal-to-noise Apparatus for automatic measurement of the video-signal-to-noise

1975-11-28

1976-11-30

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178DIG4, 325363, H04N 702

Patent

active

039951057

ABSTRACT:
An apparatus for automatic measurement of the video signal-to-noise ratio in a television channel comprises a video signal pre-processing unit, the inputs thereof being connected to the outputs of a unit measuring the peak-to-peak amplitude of the video signal, a sync separator and a control unit respectively. Another output of the sync separator is connected to a series combination of the following units controlled by the control unit; a short pulse shaper, a pulse-amplitude modulator, a switch, a pulse stretcher, a means for converting the pulse amplitude to a number of pulses, a means for producing the differences between samples, an analyzer of the differences between samples, a digital function generator and a digital display. The output of the means for producing the differences between samples is connected to one of the inputs of the unit measuring the peak-to-peak amplitude of the video signal, another input of which is coupled by way of the video signal pre-processing unit to the input of the pulse-amplitude modulator, another output of the unit measuring the peak-to-peak amplitude of the video signal being connected to one in the inputs of the switch.

REFERENCES:
patent: 2953746 (1960-09-01), Benewicz
patent: 3506915 (1970-04-01), Harris et al.
patent: 3683282 (1972-08-01), D'Amato et al.
patent: 3875328 (1975-04-01), Gibson

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