Efficient Coding Translation of GSM and G.729 Speech Coders across Mobile and IP Networks

Shu-Min TSAI  Jia-Ching WANG  Jar-Ferr YANG  Jhing-Fa WANG  

IEICE TRANSACTIONS on Information and Systems   Vol.E87-D   No.2   pp.444-452
Publication Date: 2004/02/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Speech and Hearing
speech coding,  transcoder,  parameter translation,  Internet protocol (IP),  decode-then-encode (DTE),  

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In this paper, we propose a speech coding translation scheme by transferring coding parameters between GSM half rate and G.729 coders. Compared to the conventional decode-then-encode (DTE) scheme, the proposed parameter conversions provide speech interoperability between mobile and IP networks with reducing computational complexity and coding delay. Simulation results show that the proposed methods can reduce about 30% computational load and coding delay acquired in the target encoders and achieve almost imperceptible degradation in performance.