Video attenuator with output combined with signal from non-linea

Details Video attenuator with output combined with signal from non-linea Video attenuator with output combined with signal from non-linea

1993-04-14

1994-09-20

Groody, James J.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348676, H04N 520

Patent

active

053493893

ABSTRACT:
A video input signal is applied to a bridged-T attenuator which includes a non-linear element in the shunt branch thereof that provides increasing attenuation as the input signal increases to thereby produce a gamma corrected video output signal at the attenuator output. A current sensor in the shunt branch generates an exponentially increasing detail signal for increases in the video input signal. The detail signal is high pass filtered and combined with the gamma corrected signal by a summing circuit for providing a video output signal having gamma correction and high frequency detail augmentation.

REFERENCES:
patent: 3047656 (1962-07-01), Suhrmann et al.
patent: 3588338 (1971-06-01), Dischert
patent: 4558363 (1985-12-01), Sugimoto
patent: 5083198 (1992-01-01), Haferl et al.

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