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:
Feb. 23, 1993
Filed:
Mar. 10, 1989
Nobutaka Amada, Totsuka-ku, Yokohama-shi, JP;
Takaharu Noguchi, Totsuka-ku, Yokohama-shi, JP;
Hiroyuki Kimura, Naka-gun, Kanagawa-ken, JP;
Masaharu Kobayashi, Totsuka-ku, Yokohama-shi, JP;
Takao Arai, Midori-ku, Yokohama-shi, Kanagawa-ken, JP;
Yasufumi Yumde, Totsuka-ku, Yokohama-shi, Kanagawa-ken, JP;
Kuniaki Miura, Naka-gun, Ibaraki-ken, JP;
Other;
Abstract
In an information recording/reproducing apparatus for recording/reproducing a digital audio signal on/from a magnetic medium, a modulator/demodulator for modulating/demodulating the digital signal by offset quadrature phrase shift keying (O-QPSK). This technique is particularly applicable to the multi-layer recording of video and audio signals in a video tape recording/reproducing system and has the advantage of avoiding interference between the recorded digital audio and video signals at the time of reproduction.