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http://dx.doi.org/10.7776/ASK.2008.27.8.427

Transcoding Algorithm for SMV and AMR Speech Coder  

Lee, Duck-Jong (충북대학교 전파공학과)
Jeong, Gyu-Hyeok (충북대학교 전파공학과)
Lee, In-Sung (충북대학교 전파공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.27, no.8, 2008 , pp. 427-434 More about this Journal
Abstract
In this paper, a transcoding algorithm for SMV and AMR speech coder is proposed. In the application requiring the interoperability of different networks, two speech coders must work together with the structure of cascaded connection, tandem. The tandem which is one of the simplest methods has several problems such as long delay, high complexity and the quality degradation due to twice complete encoding/decoding process. These problems can be solved by using transcoding algorithm. The proposed algorithm consists of LSP (Line Spectral Pair) conversion, pitch delay conversion, and fast fixed codebook search. The evaluation results show that the proposed algorithm achieves equivalent speech quality to that of tandem with reduced computational complexity and delay.
Keywords
Transcoding; AMR; SMV; Tandem; Fast fixed codebook search;
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