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. 03, 1998
Filed:
Apr. 04, 1994
Daniel Wayne Griffin, Hollis, NH (US);
Jae S Lim, Winchester, MA (US);
Digital Voice Systems, Inc., Burlington, MA (US);
Abstract
A method of encoding speech analyzes a digitized speech signal to determine excitation parameters for the digitized speech signal. The method includes dividing the digitized speech signal into at least two frequency bands, performing a nonlinear operation on at least one of the frequency bands to produce a modified frequency band, and determining whether the modified frequency band is voiced or unvoiced. The nonlinear operation is an operation that emphasizes a fundamental frequency of the digitized speech signal so that the modified frequency band signal includes a component corresponding to the fundamental frequency even when the at least one frequency band signal does not include such a component.