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:
May. 19, 1987
Filed:
Mar. 20, 1985
Masao Kanda, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A noise reduction circuit for eliminating the noises contained in a composite color video signal, including a high-pass filter for extracting high-frequency components from composite color video signal, an amplitude limiter responsive to the high-frequency components to limit the amplitudes of these components, a phase inverter for inverting the phase of the output from the amplitude-limiter, a mixing network receiving both of the composite color video signal and the output from the phase inverter so that the noises contained in the former are substantially cancelled by the latter, wherein a notch filter is provided to attenuate signal components of a predetermined frequency contained in the input signal to the amplitude limiter to remove the chrominance component from the signal to be supplied to the amplitude limiter. The noise reduction circuit is useful especially in a composite color video reproduction system of a constant-line-velocity video disc player having special reproduction modes such as the still-motion, fast-feed and slow-motion modes.