Title :
A high performance digital voice echo canceller on a single TMS32020
Author :
Cole, Christopher R. ; Haoui, Amine ; Winship, Peter L.
Author_Institution :
Teknekron Communications Systems, Berkeley, California
Abstract :
In this paper we describe the implementation of a complete 128-tap (16-ms span) digital voice echo canceller on a Texas Instruments TMS32020 programmable signal processor. A block update method is used in the filter coefficients adaptation. The method exhibits better convergence properties and computational efficiency than the standard stochastic gradient method. The echo canceller implementation features a direct interface for standard PCM codecs and meets the requirements of the CCITT recommendation G.165. A hardware demonstration system has been constructed and tested and its performance exceeds that of commercially available products.
Keywords :
Code standards; Computational efficiency; Convergence; Echo cancellers; Filters; Gradient methods; Instruments; Phase change materials; Signal processing; Stochastic processes;
Conference_Titel :
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '86.
DOI :
10.1109/ICASSP.1986.1169051
