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:
Oct. 28, 2003
Filed:
Sep. 12, 2000
Motorola, Inc., Schaumburg, IL (US);
Abstract
A voiced/unvoiced speech classifier ( ) includes a speech segmentor ( ) which segments an input digitized speech waveform into frames of speech and a band-pass filter ( ) which filters the frames of speech. A relative energy generator ( ) generates a relative energy value for each filtered frame of speech and a decision parameter generator ( ) including an autocorrelation calculator ( ) and a pitch calculator ( ) generates a decision parameter based on an autocorrelation function and a pitch frequency index for the filtered frames of speech. A normalized energy calculator ( ) adjusts the threshold and then normalizes the relative energy. A comparator ( ) provides a signal indicative of whether a frame of speech is voiced speech or unvoiced speech depending on a comparison of the decision parameter and the normalized relative energy value for each filtered frame of speech.