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. 26, 2001
Filed:
Sep. 16, 1998
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An improved method of providing a pitch shifted or frequency transformed signal includes frequency scaling the original signal (,) and generating a desired spectrum envelope of the frequency transformed signal, A,(z) by LPC analysis of the original signal (,). Further the method includes producing an approximation of the spectrum envelope of the frequency scaled signal A,(z, &bgr;) by performing LPC analysis on the original signal (,), obtaining LSFs (,), scaling (,) and transforming the scaled LSFs back to LPC (,). The spectrum envelope of the frequency scaled signal is whitened or flattened by the approximation of the spectrum of the frequency scaled signal and the desired spectrum envelope is added at filter (,) where the transfer characteristics of the filter is