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A method of coding LSP residual signals using wavelets for speech synthesis
Author(s) -
Shimizu Tadaaki,
Kimoto Masaya,
Yoshimura Hiroki,
Isu Naoki,
Sugata Kazuhiro
Publication year - 2004
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.10326
Subject(s) - wavelet , residual , speech recognition , harmonic vector excitation coding , computer science , sub band coding , speech coding , coding (social sciences) , linear predictive coding , haar wavelet , algorithm , discrete wavelet transform , wavelet transform , mathematics , artificial intelligence , statistics
This paper presents a method of using wavelet analysis for speech coding and synthesis by rule. It is a coding system where LSP residual signal is transformed into wave‐let coefficients. As wavelet analysis is implemented effectively by filter banks, our method requires less computation than multipulse coding and others where complicated prediction procedures are essential. To achieve good‐quality speech at low bit rates, we verified allocation of different bits onto the wavelet coefficients, with more bits in lower frequencies, and less in higher. The synthesized speech by Haar wavelet with 16.538 kbit/s has nearly the same perceptual quality with 6 bits µlog PCM (66.15 kbit/s). We are convinced that the coding method of LSP residual signals using wavelet analysis is an effective approach to synthesize speech. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 148(3): 54–61, 2004; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10326