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:
Jul. 05, 2005
Filed:
Dec. 19, 2000
Masato Tanaka, Tokyo, JP;
Eiji Shinsho, Tokyo, JP;
Meizhong Wang, Tokyo, JP;
Yoshinori Shinohara, Tokyo, JP;
Kazuhiko Seki, Tokyo, JP;
Masato Tanaka, Tokyo, JP;
Eiji Shinsho, Tokyo, JP;
Meizhong Wang, Tokyo, JP;
Yoshinori Shinohara, Tokyo, JP;
Kazuhiko Seki, Tokyo, JP;
Uniden Corporation, Tokyo, JP;
Abstract
Provided is a device for improving voice signal in quality by discriminating a radio environment of a signal transmission path and detecting a click noise. The device for improving voice signal in quality calculates an average value for a short interval of a received ADPCM code, identifies from such average value the nature of a radio environment of a signal transmission path, and considers that a click noise is occurred when the average value exceeds a threshold value assigned radio environment. The present invention comprises a click noise detector () for outputting a click noise detecting signal, and a click noise suppressing circuit for suppressing the click noise by setting the velocity coefficient of an ADPCM decoder () as '0' for a frame in which a frame error detecting signal, which represents the detection of a frame error of the received ADPCM code, and a click noise detecting signal are both detected.