Noise impaired echo path modelling using chaotic coded speech

Author

Elmirghani, J.M.H. ; Almehyas, A.M. ; Milner, S.H. ; Cryan, R.A.

Author_Institution

Univ. of Northumbria, Newcastle, UK

Volume

3

fYear

1996

Firstpage

2088

Abstract

An experimental evaluation of an echo path modelling device is reported for chaotically coded speech telephony circuits. Results show that uncoded speech is ineffective in driving the model when noise-to-echo ratios exceed approximately -30 dB and thus invalidates live measurements. The chaotic modulation, however, increased the transmitted signal energy and allowed adaptation for far end noise conditions exceeding 30 dBs higher than that of the uncoded case. Furthermore, for the practical range of noise conditions considered, it is shown that the proposed coding scheme results in a faster convergence rate than the upper bound established for the noiseless uncoded case

Keywords

adaptive filters; chaos; convergence of numerical methods; echo; echo suppression; speech coding; telephony; chaotic coded speech; chaotic modulation; chaotically coded speech telephony circuits; convergence rate; far end noise conditions; noise impaired echo path modelling; noise-to-echo ratio; transmitted signal energy; Adaptive filters; Chaos; Circuit noise; Convergence; Least squares approximation; Speech coding; Speech enhancement; Telephony; Upper bound; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 1996. GLOBECOM '96. 'Communications: The Key to Global Prosperity

Print_ISBN

0-7803-3336-5

Type

conf

DOI

10.1109/GLOCOM.1996.592002

Filename

592002