Noise reduction circuit for an imaging and recording apparatus w

Details Noise reduction circuit for an imaging and recording apparatus w Noise reduction circuit for an imaging and recording apparatus w

1989-07-31

1991-02-12

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

358163, H04N 314

Patent

active

049928767

ABSTRACT:
A noise reduction circuit receives a periodic signal from an imaging device, and includes first and second circuits in which noise components opposite in phase are offset by delaying the input signal to produce a delayed signal and adding the delayed signal and the input signal. The output of the first circuit is supplied to a low pass filter, while the output of the second circuit is integrated through a first high-pass filter for a time wherein an output signal representing the sum of the input signal and the delayed signal is generated and is then outputted through a second high pass filter. Output signals of the low-pass filter and the second high-pass filter are then added and the result is outputted as a signal free noise.

REFERENCES:
patent: 4680624 (1987-07-01), Murakami
patent: 4703442 (1987-10-01), Levine
patent: 4742394 (1988-05-01), Dielhof

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