The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 1990
Filed:
Nov. 01, 1989
Yasutoshi Matsuo, Kawasaki, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
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.