Television signal amplifier apparatus for counteracting effects

Details Television signal amplifier apparatus for counteracting effects Television signal amplifier apparatus for counteracting effects

1974-11-01

1976-09-21

Mayer, Albert J.

Telegraphy

Systems

Simplex-reversing periodic

178DIG12, 178DIG30, H04N 316

Patent

active

039820670

ABSTRACT:
Television signal amplifier apparatus is described which protects undesirable impairment of the television signal. The apparatus includes a video signal amplifier. High speed switching devices are operative to control the gain of the amplifier as well as the amplifier output. These high speed switching devices are operated by fast acting signal level detectors and a fast acting sync signal detector, such that any signals above certain levels in the white and black regions of the television signal are suppressed even if of very short duration. The synchronizing signal detector operates to reduce the gain of the amplifier to less than unity, thus suppressing oscillation modes established in the video signal transmission path caused by looping the output to the input, as may occur in the course of television signal handling operations.

REFERENCES:
patent: 2829247 (1958-04-01), Thomas
patent: 3735035 (1973-05-01), Kowalski et al.
patent: 3812289 (1974-05-01), Avins

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