Sixth European Conference on Speech Communication and Technology

Budapest, Hungary
September 5-9, 1999

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

Rainer Martin, Hong-Goo Kang, Richard V. Cox

AT&T Labs-Research, Speech and Image Processing Services Research Lab, Florham Park, NJ, USA

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 in uence on the parameter estimation than the samples in the current frame. Therefore, these samples 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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Bibliographic reference.  Martin, Rainer / Kang, Hong-Goo / Cox, Richard V. (1999): "Low delay analysis/synthesis schemes for joint speech enhancement and low bit rate speech coding", In EUROSPEECH'99, 1463-1466.