Signal to noise ratio measurement by sampling noise outside carr

Details Signal to noise ratio measurement by sampling noise outside carr Signal to noise ratio measurement by sampling noise outside carr

1986-06-02

1988-01-26

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358139, H04N 1700, H04N 1702

Patent

active

047219971

ABSTRACT:
The signal-to-noise ratio of the video portion of a television signal is measured by measuring the noise level in a 200 KHz band spaced 2 MHz from the video carrier during the vertical sync period and the carrier level is also measured during the vertical sync period. The two measurement signals are sequentially applied to a microprocessor which calculates the signal-to-noise ratio from the two measurements and drives a meter which displays the signal-to-noise ratio in decibels.

REFERENCES:
patent: 3683282 (1972-08-01), D'Amato et al.
patent: 3875328 (1975-04-01), Gibson et al.
patent: 3995105 (1976-11-01), Krivosheev et al.
"Signal-To-Noise Ratio Automatic Measurement in the Blanking Interval of a Video Signal" by Dr. Ing. P. D'Amato & Dr. Ing. G. Barbieri, Conference: Proceedings of the Joint Conference on Television Measuring Techniques, London, May 1970.

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