Picture display device comprising a noise detector

Details Picture display device comprising a noise detector Picture display device comprising a noise detector

1984-08-09

1987-01-13

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, H04N 504

Patent

active

046368604

ABSTRACT:
A picture display device having a synchronizing signal separating stage, a field synchronizing signal separating stage, a line synchronizing circuit and a field synchronizing circuit. The picture display device also has a noise detector for detecting noise in an incoming video signal and for changing over portions of the picture display device in dependence on the detected noise signal. The noise detector includes a noise separating stage for amplifying the noise present during the occurrence of a sampling pulse, which pulse is derived from a line reference signal produced by the line synchronizing circuit. The noise detector further includes a counting arrangement for counting the number of times the noise signal, amplified in the noise separating stage, exceeds a predetermined value and for producing a change signal when this number found during the counting operation has reached a predetermined value during a predetermined number of line periods in the field trace period.

REFERENCES:
patent: 4376952 (1983-03-01), Troiano
patent: 4488170 (1984-12-01), Nillesen
patent: 4496978 (1985-01-01), Sakamoto et al.

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