Circuit for inhibiting radio frequency interference in a televis

Details Circuit for inhibiting radio frequency interference in a televis Circuit for inhibiting radio frequency interference in a televis

1979-08-10

1981-06-30

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, 358 39, 358 36, H04N 514, H04N 521

Patent

active

042765668

ABSTRACT:
In a television receiver comprising a video output stage for supplying amplified image representative video signals to a color kinescope, a signal clipping network is included for inhibiting video signal amplitude transitions otherwise capable of inducing radio frequency interference (RFI) by causing the video output stages to change between saturated and nonsaturated conductive states. The network is disposed in a low level video signal processing channel of the receiver, and serves to clip peak transient signal amplitude excursions likely to induce RFI in the video output stage. The clipping network exhibits a "floating" clipping level to account for variations in the black reference level of the video signal, and therefore variations in the peak level of transients likely to induce RFI, due to unit-to-unit tolerance variations of preceding signal processing circuits. A low pass filter is coupled between the clipping network and the video output stage for attenuating high frequency signals above the band of frequencies of signals normally processed by the video processing channel.

REFERENCES:
patent: 2861180 (1958-11-01), Sonnenfeldt
patent: 2914606 (1959-11-01), Loughlin
patent: 3557305 (1971-01-01), Dann
patent: 3980815 (1976-09-01), Kaneko
patent: 3983576 (1976-09-01), Shanley et al.
patent: 4091420 (1978-05-01), Omori et al.
patent: 4158852 (1979-06-01), Harlan
Towers, Transistor Television Receivers, John F. Rider Publishing Co., New York, pp. 72-73, 1963.

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