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:
Mar. 09, 2004
Filed:
Feb. 02, 2001
Mohand Ferhaoul, Rouiba, DZ;
Jean-Francois Rasaminjanahary, Fandriana, MG;
Stefaan Van Gerven, Heverlee, BE;
Abderrahman Essebbar, CYM Rabat, MA;
ScanSoft, Inc., Peabody, MA (US);
Abstract
The excitation in a CELP-like speech coder is recursively calculated. For a given bitrate and a given complexity, the recursive approach described lowers the complexity with minimum impact on speech quality. The excitation signal is a sum of at least three vector terms, each vector term being a product of a codebook vector z and an associated gain term g . A first vector term g z is determined that is representative of a target excitation vector x. Each remaining vector term is recursively determined as a vector term g z representative of the difference between the target excitation vector x and the sum of previously determined vector terms,