Pitch searching time reducing method for code excited linear pre

Details Pitch searching time reducing method for code excited linear pre Pitch searching time reducing method for code excited linear pre

1996-09-19

1998-09-22

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704209, 704219, G10L 302

Patent

active

058129669

ABSTRACT:
An improved pitch searching time reducing method for a CELP vocoder using a Line Spectral Pair (LSP) frequency which is capable of significantly reducing the pitch search time by separating the speech signal using a first formant frequency of the line spectral pair of the digital type personal communication system, which includes the steps of computing a decimation interval of a pitch search interval using an LSP frequency of a first formant computed by a formant filter so as to compute a preparatory pitch of a given speech; determining a preparatory pitch to be used when searching a pitch by detecting a peak and a valley within each decimation interval; and computing a preparatory pitch by adapting a first formant frequency of an LSP computed by a formant filter with a decimation rate and performing a pitch search with respect to the obtained preparatory pitch.

REFERENCES:
patent: 4282406 (1981-08-01), Yato et al.
patent: 5233660 (1993-08-01), Chen
patent: 5699477 (1997-12-01), McCree
patent: 5710863 (1998-01-01), Chen
Speech Classification Embedded in Adaptive Codebook Search for CELP Coding; Chih-Chung Kuo, Fu-Rong Jean and Hsiao-Chuan Wang; 1993; pp. II147-II150. ICASSP-93. 1993 IEEE International Transactions on Acoustics, Speech and Signal Processing. Apr. 1993.

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