Noise reduction circuit

Details Noise reduction circuit Noise reduction circuit

1992-04-16

1993-07-13

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307542, 307543, 307556, 307520, 307358, 307529, H03K 500, H03K 5153

Patent

active

052277321

ABSTRACT:
A circuit for reducing noise from a luminance signal which controls the brightness of the screen in a video apparatus such as a color TV, VCR or VDP is disclosed. The circuit comprises a gate circuit for time-chopping a noisy luminance signal by a predetermined interval, a level detector for integrating the chopped luminance signal to detect an average DC level, a clipping circuit for clipping the chopped luminance signal based on the average DC level, a subtracter for subtracting the clipped signal from the chopped luminance signal, a level shift circuit for shifting the level of the subtracted luminance signal according to the average DC level and compensating the clipped luminance level, and a low-pass filter for low-pass-filtering the level-shifted signal, to thereby restore it to an original-waveform luminance signal. Accordingly, the circuit can prevent the edge of the luminance signal from being collapsed due to noise, resulting in the output of a noiseless luminance signal.

REFERENCES:
patent: 4144500 (1979-03-01), Tokunaga
patent: 4311963 (1982-01-01), Watanabe et al.
patent: 4460871 (1984-07-01), Orban
patent: 4736163 (1988-04-01), Berkhout et al.
patent: 5087834 (1992-02-01), Tsay
patent: 5130579 (1992-07-01), Thomas

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