Television receiver with partially by-passed non-linear luminanc

Details Television receiver with partially by-passed non-linear luminanc Television receiver with partially by-passed non-linear luminanc

1991-05-06

1993-04-13

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 31, 358 39, H04N 5208

Patent

active

052027635

ABSTRACT:
A composite video input signal is separated into luminance and chrominance components by a signal separation filter and the components are applied to a display processor having a video display device coupled thereto for providing displayed images. For enhancement of detail in dark and light areas of the displayed images, the luminance signal is coupled to the display processor via a non-linear luminance signal processor which provides additional amplification in the dark and light areas but tends also to degrade the signal to noise ratio in those areas. To avoid a loss of signal to noise ratio in the enhanced areas the receiver includes a by-pass circuit for by-passing high frequency components of the luminance signal around the non-linear luminance signal processor and a filter in the non-linear luminance signal processor for attenuating the high frequency components.

REFERENCES:
patent: 2760008 (1956-08-01), Schade
patent: 4365266 (1982-12-01), Lagoni
patent: 4489349 (1984-12-01), Okada
patent: 4638351 (1987-01-01), Clarke
patent: 5079633 (1992-01-01), Hagino et al.
patent: 5081450 (1992-01-01), Lucas et al.

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