Noise reduction apparatus

Details Noise reduction apparatus Noise reduction apparatus

1977-05-26

1979-09-11

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358167, H04N 514, H04N 578, H04N 9535

Patent

active

041677498

ABSTRACT:
In a system where improvement of the signal-to-noise ratio for a wideband video signal is effected by subtraction therefrom of a signal which follows low-amplitude excursions, within selected close-to-axis limits, of the video signal's high frequency component, means are provided for varying the selected close-to-axis limits in response to variations in the level of noise accompanying the video signal. In an illustrative use, the noise reduction apparatus is advantageously employed to process a luminance signal component separated by the comb filtering from a composite signal recovered during playback of a video disc, with the limits varying means being responsive to variations in the level of noise accompanying the luminance signal components. The subtraction step is effected in apparatus also serving to recombine separated luminance and chrominance components for formation of the disc player's output composite signal.

REFERENCES:
patent: 3602737 (1971-08-01), Radecke
patent: 3715477 (1973-02-01), Olson et al.
patent: 3872387 (1975-03-01), Banach
patent: 3971064 (1976-07-01), Milbourn
patent: 4009334 (1977-02-01), Sypula
patent: 4031547 (1977-06-01), Saiki et al.
patent: 4074321 (1978-02-01), Miller

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