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:
Jun. 12, 2007
Filed:
Sep. 24, 2004
Timo Antero Kosonen, Tampere, FI;
Timo Antero Kosonen, Tampere, FI;
Nokia Corporation, Espoo, FI;
Abstract
In one aspect thereof this invention provides a method to estimate pitch in an acoustic signal. The method includes initializing a function ƒand a time t, where t=0, x'=ƒ(F), x′is a pitch estimate at time zero and Fis a frequency of the acoustic signal at time zero; determining at least one pitch estimate using the function x′=ƒ(F) by an iterative process of creating ƒ(F) based at least partly on pitch estimates x′, x′, x′, . . . , and functions ƒ(F), ƒ(F), ƒ(F), ƒ(F) . . . and incrementing t; and calculating at least one final pitch estimate. Embodiments of this invention can be applied to pitch extraction with various different input acoustic signal characteristics, such as just intonation, pitch shift in the frequency domain, and non-12-step-equal-temperament tuning.