Dark level restoring circuit for television receiver

Details Dark level restoring circuit for television receiver Dark level restoring circuit for television receiver

1994-06-30

1995-10-03

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Picture blanking

348637, 348633, H04N 324

Patent

active

054556341

ABSTRACT:
A dark level restoring circuit for a television receiver which receives a video signal, clamps a pedestal portion of the video signal to a reference pedestal level by a pedestal clamper, compares the output of the pedestal clamper with a reference dark level, and amplifies the compared result by a gain control amplifier. The output of the pedestal clamper and the amplified compared result are synthesized, the dark peak level is held, and the held dark peak level and the reference pedestal level are compared wherein the gain of the gain control amplifier is controlled by the compared result. A blanking signal is received, and a mute signal is generated which corresponds to a non-video signal portion when the effective raster size of the video signal is smaller than the size of a face plate of a cathode ray tube to which the video signal is supplied. The blanking signal and the mute signal are synthesized and a control signal is generated which controls the gain control amplifier such that its gain is minimized and the holding of the dark peak level is inactive.

REFERENCES:
patent: 4028226 (1977-07-01), Argy
patent: 4631589 (1986-12-01), Hongu et al.
patent: 4668974 (1987-05-01), Kita et al.
patent: 4942471 (1990-07-01), Chikuma et al.
patent: 5134479 (1992-07-01), Ohishi

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