Abstract
Acoustic echo cancellation (AEC) is a well-studied problem. The underlying assumption in most echo cancellation solutions is that the echo path following the reference signal is completely linear. However, in many handheld devices, the echo path following the reference signal is nonlinear. The reason for this nonlinearity in the echo path is the use of smaller inexpensive loudspeakers and the desire for generating high sound pressure levels. This brings about the need for a nonlinear echo canceler to maintain the required echo return loss enhancement (ERLE). Many software-based solutions have been proposed to solve this problem, but the computational complexity of these solutions is prohibitively high for practical implementation. This paper analyzes the sources of nonlinearities in smartphones and proposes a simple, elegant hardware modification to significantly reduce nonlinear echo. Thorough analysis and intensive testing results show that up to 6 dB of improvement in ERLE in a real device is possible using the proposed technique.
Recommended Citation
P. Shah et al., "Nonlinear Acoustic Echo Cancellation using Voltage and Current Feedback," IEEE Transactions on Audio, Speech and Language Processing, vol. 23, no. 10, pp. 1589 - 1599, article no. 7093153, Institute of Electrical and Electronics Engineers, Oct 2015.
The definitive version is available at https://doi.org/10.1109/TASLP.2015.2425955
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
Current feedback; nonlinear echo cancellation; voltage feedback
International Standard Serial Number (ISSN)
1558-7916
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Oct 2015
