Michael M Fee

US Patent:

62633066, Jul 17, 2001

Filed:

Feb 26, 1999

Appl. No.:

9/259644

Inventors:

Michael Sean Fee - New Vernon NJ
Ching Elizabeth Ho - San Marino CA
Partha Pratim Mitra - Jersey City NJ
Bijan Pesaran - Pasadena CA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G10L 1104
G10L 1502

US Classification:

704203

Abstract:

A technique for obtaining an intermediate set of frequency dependant features from a speech signal for use in speech processing and in obtaining estimates of speech pitch. The technique utilizes multiple tapers derived from Slepian sequences to obtain a product of the speech signal and the Slepian functions. Multiple tapered Fourier transforms are then obtained from the product, from which the set of frequency dependent features are calculated. In a preferred embodiment, a derivative of the cepstrum of the speech signal is used as an estimate of speech signal pitch. In another preferred embodiment, the F-spectrum is calculated from the product and the F-cepstrum is obtained therefrom by calculating the Fourier transform of the smoothed derivative of the log of the F-spectrum. The maximum of the F-cepstrum also provides a pitch estimation.