1 Department of Architecture, Design and Media Technology, The Technical Faculty of IT and Design, Aalborg University, VBN2 Audio Analysis Lab, The Technical Faculty of IT and Design, Aalborg University, VBN3 The Faculty of Engineering and Science (TECH), Aalborg University, VBN4 Sektion Aalborg, The Technical Faculty of IT and Design, Aalborg University, VBN5 Media Technology, The Technical Faculty of IT and Design, Aalborg University, VBN
In the vast amount of time-domain filtering methods for speech enhancement, the filters are designed to be causal. Recently, however, it was shown that the noise reduction and signal distortion capabilities of such single-channel filters can be improved by allowing the filters to be non-causal. While non-causal filters require knowledge of the future, they can be implemented in practice by introducing a short delay. In this paper, we generalize the idea of exploiting non-causality in optimal filter designs to the multichannel scenario. More specifically, a set of optimal, non-causal, multichannel filters for enhancement based on an orthogonal decomposition is proposed. The evaluation shows that there is a potential gain in noise reduction and signal distortion by introducing non-causality. Moreover, experiments on real-life speech show that we can improve the perceptual quality.
Proceedings of the ... Ieee International Conference on Acoustics, Speech, and Signal Processing, 2013, p. 7274-7278
signal enhancement; multichannel; non-casual; time-domain filtering; non-causal
Main Research Area:
I E E E International Conference on Acoustics, Speech and Signal Processing. Proceedings
2013 IEEE International Conference on Acoustics, Speech, and Signal ProcessingInternational Conference on Acoustics, Speech and Signal Processing, 2013