13th Annual Conference of the International Speech Communication Association

Portland, OR, USA
September 9-13, 2012

Developments of a Hybrid Pre-Processor Based on Frequency Shifting for Stereophonic Acoustic Echo Cancellation

Bruno C. Bispo, Diamantino S. Freitas

Department of Electrical and Computer Engineering, University of Porto, Portugal

In a multi-channel hands-free communication, decorrelation algorithms are necessary, along with adaptive filters, to efficiently remove the acoustic echo in real time applications. But the quality of the signals and the spatial position of the sound source must not be perceptually affected by those algorithms. This paper proposes a new hybrid solution that uses frequency shifts to improve the performance of a state-ofart solution based on addition of half-wave rectified signals. The results show that the new method achieves a significant improvement in the identification process of the real echo paths as well as in the global perceptual quality of the processed signals.

Index Terms: stereophonic acoustic echo cancellation, frequency shifting, speech decorrelation

Full Paper

Bibliographic reference.  Bispo, Bruno C. / Freitas, Diamantino S. (2012): "Developments of a hybrid pre-processor based on frequency shifting for stereophonic acoustic echo cancellation", In INTERSPEECH-2012, 1922-1925.