Noise reduction system for television signals

Details Noise reduction system for television signals Noise reduction system for television signals

1982-05-13

1984-11-27

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, 455296, H04N 521

Patent

active

044854030

ABSTRACT:
In a system for noise reduction in a television signal utilizing a full frame picture store to enable averaging of corresponding signals of successful frames for noise reduction and having also a motion detector, the signal representing motion is passed through a combination of a low-pass filter and a threshold circuit of which, respectively, the cut-off frequency and the threshold value are controllable as a function of the noise amplitude. As a result, at low noise content of the input signal, no disturbing loss of sharpness of moving edges occurs, whereas at higher noise amplitudes, although noise reduction is at the cost of some loss of edge sharpness, the annoying effects of having noise reduction controlled by the noise itself, are avoided.

REFERENCES:
patent: 4128848 (1978-11-01), Nakagawa
patent: 4242705 (1980-12-01), Ebihara
patent: 4249209 (1981-02-01), Storey
patent: 4296436 (1981-10-01), Achiha
patent: 4352126 (1982-09-01), Poncin

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