Patent ID: 6108621
Filing Date: 2000-08-22
Classification: G10L

Abstract:
A speech analysis method in which an input speech signal is divided on the time axis in terms of a pre-set encoding unit and a pitch equivalent to a basic period of the Input speech signal thus divided into the encoding units is detected, and in which the input speech signal is analyzed from one encoding unit to another based on the detected pitch, comprising the steps of:splitting the frequency spectrum of the input speech signal into a predetermined plurality of frequency bands on the frequency axis; andsimultaneously carrying out a pitch search and an evaluation of amplitudes of harmonics using a detected pitch derived from a spectral shape from one band to another by minimizing an evaluation error of the amplitudes of harmonics over each of the predetermined plurality of frequency bands, wherein the pitch search and the evaluation of the amplitudes of harmonics are carried out based on a rough pitch detected by an open-loop search prior to performing the pitch search and evaluation.