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. 02, 1999
Filed:
Sep. 15, 1995
Kazunobu Kondo, Shizuoka-ken, JP;
Akitoshi Saito, Shizuoka-ken, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
An encoding apparatus provided at the transmission side includes a low pass filter, a high pass filter, a nonvoice band detecter, a switch and an adder for separating a speech component and a background noise component from an inputted signal. The low pass filter provides a voice band of the speech component and the high pass filter provides a nonvoice band of the speech component. The nonvoice band component is separated from the background noise portion of the output of the high pass filter and re-combined with the voice band to provide the separated speech component. The separated speech component and the background component are individually encoded by a speech encoder and a noise encoder, respectively, and transmitted. In a decoding apparatus at the reception side, the speech component and the background noise component are individually decoded by a speech decoder and a noise decoder, respectively. The decoded speech component and the background noise component are level-adjusted based upon an appropriate level ratio by level controllers, respectively, and then mixed by an adder and outputted as a reproduced signal.