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:
Sep. 10, 1991
Filed:
Mar. 15, 1989
Katsuyuki Watanabe, Katsuta, JP;
Tomomitsu Kuroyanagi, Katsuta, JP;
Atsushi Yoshioka, Yokohama, JP;
Michio Masuda, Yokohama, JP;
Toshiro Aizawa, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A luminance and chrominance signal separation circuit for use in a video tape recorder wherein in the recording mode a three-line comb filter is made to be an adaptive type comb filter for separating a luminance signal from a chrominance signal and in the playback mode the comb filter is made to eliminate residual chrominance signal components in the luminance signal. Switching circuits are provided in the invention to permit the switching of the luminance and chrominance signal separation circuit between recording and playback modes and noise reduction is accomplished by a feedback line correlation circuit.