The application of adaptive echo cancellation technique in analog full-duplex speech scrambling systems

Author

Hua, Ye ; Wu, Bo-Xiu

Author_Institution

Dept. of Radio Eng., Nanjing Inst. of Technol., China

fYear

1988

fDate

12-15 June 1988

Firstpage

85

Abstract

The adaptive echo cancellation technique is used to deal with the echo problems associated with analog full-duplex speech scrambling systems. The influence of scrambling process on adaptive algorithms is analyzed through computer simulation. It is shown that the whitening effect caused by the scrambling process has little influence on least-squares (LS) algorithms but is especially beneficial to least-mean-square (LMS) algorithms. The authors thus conclude that it is very effective to use LMS algorithms in analog scrambling systems. Based on this conclusion, a high-performance adaptive echo canceller using a single TMS32010 processor has been implemented, the experimental results coincide with computer simulation.<>

Keywords

digital simulation; echo suppression; least squares approximations; microprocessor chips; speech analysis and processing; telecommunications computing; TMS32010 processor; adaptive algorithms; adaptive echo cancellation technique; analogue full-duplex speech scrambling system; computer simulation; least mean square algorithms; Adaptive algorithm; Adaptive filters; Algorithm design and analysis; Computer simulation; Delay; Echo cancellers; Hybrid power systems; Least squares approximation; Speech; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 1988. ICC '88. Digital Technology - Spanning the Universe. Conference Record., IEEE International Conference on

Conference_Location

Philadelphia, PA, USA

Type

conf

DOI

10.1109/ICC.1988.13540

Filename

13540