Robustness of group delay representations for noisy speech signals

Authors:
Sree Hari Parthasarathi;R. Padmanabhan;Hema A. Murthy
Affiliations:
IDIAP Research Institute, Martigny, Switzerland 1920;Department of Computer Science and Engineering, Indian Institute of Technology, Madras, India;Department of Computer Science and Engineering, Indian Institute of Technology, Madras, India
Venue:
International Journal of Speech Technology
Year:
2011

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Abstract

This paper demonstrates the robustness of group delay based features to additive noise. First, we analytically show the robustness of group delay based representations. The analysis makes use of the fact that, for minimum-phase signals, the group delay function can be represented in terms of the cepstral coefficients of the log-magnitude spectrum. Such a representation results in the speech spectrum dominating over the noise spectrum, both at low and high SNRs. Further, we experimentally demonstrate the robustness of the representation on a voice activity detection (VAD) task, comparing a group delay based VAD algorithm with standard VAD methods as well as a magnitude-spectrum based method.