Harmonic Model Based Excitation Enhancement for Low-Bit-Rate Speech Coding

Hong Kook KIM  Mi Suk LEE  Chul Hong KWON  

IEICE TRANSACTIONS on Information and Systems   Vol.E87-D   No.7   pp.1974-1977
Publication Date: 2004/07/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Speech and Hearing
low-bit-rate speech coding,  excitation enhancement,  postprocessing,  harmonic model based enhancement,  

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A new excitation enhancement technique based on a harmonic model is proposed in this paper to improve the speech quality of low-bit-rate speech coders. This technique is employed only in the decoding process of speech coders and improves high-frequency components of excitation. We develop the procedure of harmonic model parameters estimation and harmonic generation and apply the technique to a current state-of-art low bit rate speech coder. Experiments on spectrum reading and spectrum distortion measurement show that the proposed excitation enhancement technique improves speech quality.