Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1989-11-01
1990-10-09
Mullins, James B.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358167, H04N 591
Patent
active
049624342
ABSTRACT:
A recording and reproducing device for a video signal comprises a recording circuit for changing an input video signal to a recording video signal, and a reproducing circuit for changing a reproduced video signal to an output video signal. Particularly, the reproducing circuit of this device includes a first high-pass filter having a time constant Ts, a first limiter for limiting the amplitude of the output signal of the first high-pass filter, and a first coefficient multiplier circuit for multiplying an output signal of the first limiter by a first coefficient K. The reproducing circuit further includes a first computation circuit for summing an output signal of the first coefficient multiplier circuit and the output video signal to deliver a signal indicative of the summed result to the first high-pass filter, a second coefficient multiplier circuit for multiplying the output signal of the first limiter by a second coefficient X, and a second computation circuit for subtracting the output signal of the second coefficient multiplier circuit from the reproduced video signal to output the output video signal. In this circuit, when a time constant corresponding to a frequency at which the noise reduction effect becomes effective is assumed as T, the time constant Ts is set within a range expressed as T>Ts>T/(X+1). Thus, this device can satisfactorily cope with both the random noise and the impulse noise even when the emphasis quantity is set to a large value.
REFERENCES:
patent: 4607285 (1986-08-01), Hirota et al.
Meller Michael N.
Mullins James B.
Victor Company of Japan Ltd.
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