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A Transcoding Algorithm between EVRC and G.729A  

Kwon Goo-Rak (School of Electrical Engineering, Korea University)
Ko Sung-Jea (School of Electrical Engineering, Korea University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.43, no.3, 2006 , pp. 54-60 More about this Journal
Abstract
This paper presents an effective algorithm for transcoding between the Enhanced Variable Rate Codec(EVRC) and G.729A. The simplest way to communicate between heterogeneous speech networks is the cascade connection of two different codecs, called tandem coding. However, tandem coding not only produces high computational loads, but also makes long delay, These problems can be solved by using the transcoding algorithm. The proposed algorithm consists of LSP (Line Spectral Pair) conversion, pitch delay conversion and algorithm for reduction of delay. Experimental results show the proposed algorithm produces lower computational complexity, shorter algorithm delay, and similar speech quality when compared with the tandem algorithm.
Keywords
SCS; QCS;
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  • Reference
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