Digital noise reducer

Details Digital noise reducer Digital noise reducer

1988-09-16

1990-05-15

Lall, Parshotam S.

Boots, shoes, and leggings

358167, 358 36, H04N 521

Patent

active

049263617

ABSTRACT:
A digital noise reducer includes an addition circuit for adding a digital input video signal supplied at one input thereof and a signal supplied at the other input thereof and for outputting a resultant sum signal, a delay circuit for delaying the output signal of the addition circuit by an input unit period of the digital input video signal, a subtraction circuit supplied with the digital input video signal and an output signal of the delay circuit, the subtraction circuit forming and outputting a difference component signal for the digital input video signal and the output signal of the delay circuit, and a characteristic adjustment circuit for manipulating a signal characteristic of the difference component output of the subtraction circuit in accordance with the characteristic of the difference component signal outputted from the subtraction circuit and/or a characteristic of a digital output video signal outputted from the addition circuit and for outputting a resultant manipulated signal to the other input of the addition circuit.

REFERENCES:
patent: 4009334 (1977-02-01), Sypula
patent: 4112499 (1978-09-01), Mangum, Jr. et al.
patent: 4684976 (1987-08-01), Sugihara et al.
patent: 4700229 (1987-10-01), Herrmann et al.
patent: 4748499 (1988-05-01), Ueda
patent: 4750037 (1988-06-01), Kido et al.
patent: 4792855 (1988-12-01), Yoshida
patent: 4807034 (1989-02-01), Takeuchi et al.

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