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. 07, 2000
Filed:
Oct. 31, 1997
Chengjun Julian Chen, White Plains, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and apparatus for extracting pitch value information from speech. The method selects at least three highest peaks from a normalized autocorrelation function and produces a plurality of frequency candidates for pitch value determination. The plurality of frequency candidates are used to identify anchor points in pitch values, and is further used to perform both forward and backward searching when an anchor point cannot be readily identified. The running mean or average of determined pitch values is maintained and used in conjunction with the identified valid pitch values in a final determination of the pitch estimation using a weighted least squares fit for identified non-valid frames.