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:
Nov. 08, 1994
Filed:
Dec. 10, 1993
Toshihiro Miyoshi, Osaka, JP;
Naoji Okumura, Osaka, JP;
Hisashi Arita, Hyogo, JP;
Kenji Ishikawa, Osaka, JP;
Yuichi Ninomiya, Kawasaki, JP;
Yoshimichi Ohtsuka, Kawasaki, JP;
Tadashi Kawashima, Tokyo, JP;
Takushi Iwamoto, Matsuyama, JP;
Matsushita Electric Industrial, Co., Ltd., Tokyo, JP;
Nippon Hoso Kyokai, Tokyo, JP;
Abstract
A digital audio signal demodulation circuit comprises a synchronous detection circuit (18) and a muting circuit (17) for muting the output from an interpolation circuit (16) using a synchronization lock signal generated from the synchronous detection circuit (18) when synchronization has been lost. The differential signal output from the interpolation circuit (16) is muted by the muting circuit (17) and thereafter integrated by an integration circuit (19). Thus, an audio signal with high sound quality can be demodulated without producing interruption noise even when synchronization has been lost or forcible muting is done.