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Real-Time Implementation of Acoustic Echo Canceller for Mobile Handset Using TeakLite DSP Core  

Gwon, Hong-Seok (School of Electronic & Electrical Engineering, Kyungpook National University)
Kim, Si-Ho (School of Electronic & Electrical Engineering, Kyungpook National University)
Jang, Byeong-Uk (School of Electronic & Electrical Engineering, Kyungpook National University)
Bae, Geon-Seong (School of Electronic & Electrical Engineering, Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.39, no.2, 2002 , pp. 128-136 More about this Journal
Abstract
In this paper, we developed an acoustic echo canceller in real-time using TeakLite DSP Core, which will be placed in the vocoder chip of a mobile handset. Considering the limited computational capacity given to the acoustic echo canceller in a vocoder chip, we employed a FIR-type adaptive filter using a conventional NLMS algorithm. To begin with, we designed and implemented an acoustic echo canceller with floating-point format C-source code, and then converted it into fixed-point format through integer simulation. Then we programmed and optimized it in the assembler level to make it run ill real-time. After optimization procedure, the implemented echo canceller has approximately 624 words of program memory and 811 words of data memory. With 8 KHz sampling rate and 256 filter taps in the echo canceller that corresponds to 32 msec of echo delay, it requires 14.12 MIPS of computational capacity. For coverage of 16 msec echo delay, i.e., 128 filter taps, 9 MIPS is requited.
Keywords
Acoustic Echo Canceller; TeakLite; DSP Core; NLMS; Adaptive Filter;
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