An acoustic echo canceller using lapped orthogonal transform

Author

Wei, Che-Ho ; Tsai, Chung-Pei

Author_Institution

Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

4

fYear

1997

fDate

9-12 Jun 1997

Firstpage

2573

Abstract

In the teleconference system or the hands-free telephone, the speech broadcasted from the loudspeaker can be transformed back to the talker as a far-end talker-echo. The far-end talker-echo can be eliminated by an acoustic echo canceller. An acoustic echo canceller based on the lapped orthogonal transform (LOT) using discrete Walsh-Hadamard transform (DWHT) as the building block for the fast algorithm is presented. The new structure can provide better ERLE and tracking capability than the structure using the LOT presented by Malver (1992). The computation complexity of the new structure is much lower than the orthogonal transform LMS structure

Keywords

Hadamard transforms; Walsh functions; acoustic signal processing; echo suppression; speech processing; ERLE; acoustic echo canceller; algorithm; discrete Walsh-Hadamard transform; far-end talker-echo; hands-free telephone; lapped orthogonal transform; loudspeaker; speech; teleconference system; tracking; Adaptive filters; Broadcasting; Delay; Discrete transforms; Echo cancellers; Loudspeakers; Signal processing; Speech; Teleconferencing; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on

Print_ISBN

0-7803-3583-X

Type

conf

DOI

10.1109/ISCAS.1997.612850

Filename

612850