Title :
A residual echo cancellation scheme for hands-free telephony
Author :
Park, Seon Joon ; Lee, Chungyong ; Youn, Dae Hee
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea
Abstract :
A residual echo cancellation scheme based on the autoregressive (AR) analysis is proposed for hands-free telephony. Residual echo is whitened by the inverse filter using the estimated AR coefficients. Removing the speech characteristics of the residual echo signal, the noise reduction system successfully reduces the power of residual echo as well as that of ambient noise. In a car cabin, the proposed method improved the echo return loss enhancement by 8.7/spl sim/9.9 dB as compared with the conventional combined system.
Keywords :
acoustic noise; acoustic signal processing; autoregressive processes; digital filters; echo suppression; land mobile radio; least mean squares methods; speech processing; AR analysis; NLMS; ambient noise; antoregressive analysis; car cabin; hands-free telephony; inverse filter; loss enhancement; noise reduction system; normalized least mean squares; residual echo cancellation scheme; speech characteristics; Acoustic distortion; Adaptive filters; Echo cancellers; Noise cancellation; Noise reduction; Signal processing; Signal processing algorithms; Speech enhancement; Speech processing; Telephony;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2002.806053
