Low Delay Analysis/Synthesis Schemes for Joint Speech Enhancement and Low Bit Rate Speech Coding

Authors:

Martin, R. ,  Kang, H.-G. ,  Cox, R. V.

Book Title:

Proceedings of European Conference on Speech Communication and Technology (EUROSPEECH)

Organization:

ISCA

Pages:

p.p. 1463-1466

Address:

Budapest, Hungary

Date:

Sep. 1999

Language:

English

Abstract

In this contribution we discuss methods to reduce the algorithmic delay of joint speech enhancement and low bit rate speech coding algorithms. We introduce a novel overlap/add scheme which can reduce the overall delay of the joint system for some speech coders considerably. The new scheme takes advantage of the fact that some low bit rate coders store a significant amount of look-ahead samples in their input buffer. The look-ahead samples often have less influence on the parameter estimation than the samples in the current frame. Therefore, these sampl es might be used by the coder without being fully overlapped or reconstructed and with only little effect on the quality of the coded speech. The concept has been successfully used for joint enhancement and coding using the 2.4 kbps versions of the MELP and the WI speech coders.

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