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http://dx.doi.org/10.7776/ASK.2011.30.4.190

Developing a Low Power BWE Technique Based on the AMR Coder  

Koo, Bon-Kang (한양대학교 전자전기제어계측공학과)
Park, Hee-Wan (한양대학교 전자전기제어계측공학과)
Ju, Yeon-Jae (한양대학교 전자전기제어계측공학과)
Kang, Sang-Won (한양대학교 전자전기제어계측공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.30, no.4, 2011 , pp. 190-196 More about this Journal
Abstract
Bandwidth extension is a technique to improve speech quality and intelligibility, extending from 300-3400 Hz narrowband speech to 50-7000 Hz wideband speech. This paper designs an artificial bandwidth extension (ABE) module embedded in the AMR (adaptive multi-rate) decoder, reducing LPC/LSP analysis and algorithm delay of the ABE module. We also introduce a fast search codebook mapping method for ABE, and design a low power BWE technique based on the AMR decoder. The proposed ABE method reduces the computational complexity and the algorithm delay, respectively, by 28 % and 20 msec, compared to the traditional DTE (decode then extend) method. We also introduce a weighted classified codebook mapping method for constructing the spectral envelope of the wideband speech signal.
Keywords
Bandwidth Extension; Speech Codec; Speech Enhancement; AMR Codec;
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