A joint speech coding-enhancement algorithm for MBE vocoder

Author

Dai, Huaiyu ; Cao, Zhigang

Author_Institution

Dept. of Electron. Eng., Tsinghua Univ., Beijing, China

fYear

1998

fDate

22-24 Oct 1998

Abstract

Multi-band excitation vocoder can yield high speech quality at medium and low rate speech coding, but its performance degrades dramatically in low SNR environments. A joint speech coding-enhancement algorithm is proposed which integrates MBE speech coding with speech enhancement. The original MBE coding algorithm is modified for better estimation of the MBE coding parameters in a noisy environment. Especially, the MMSE-LOG speech enhancement algorithm is incorporated in the MBE frequency domain calculation, and speech enhancement using the dual excitation speech model is adopted for post-processing of the synthesized speech. The objective measure and informal listening test indicate that significant improvement can be attained with an input SNR as low as -5 dB

Keywords

frequency-domain analysis; speech coding; speech enhancement; vocoders; -5 dB; MBE vocoder; MMSE-LOG speech enhancement algorithm; dual excitation speech model; frequency domain; high speech quality; informal listening test; input SNR; joint speech coding-enhancement algorithm; low rate speech coding; medium rate speech coding; objective measure; parameter estimation; post-processing; synthesized speech; Degradation; Frequency estimation; Speech analysis; Speech coding; Speech enhancement; Speech processing; Speech synthesis; Time domain analysis; Vocoders; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Technology Proceedings, 1998. ICCT '98. 1998 International Conference on

Conference_Location

Beijing

Print_ISBN

7-80090-827-5

Type

conf

DOI

10.1109/ICCT.1998.741006

Filename

741006