Robustness of group delay representations for noisy speech signals |
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Authors: | Sree Hari Krishnan Parthasarathi R Padmanabhan Hema A Murthy |
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Affiliation: | 1.IDIAP Research Institute,Martigny,Switzerland;2.Department of Computer Science and Engineering,Indian Institute of Technology,Madras,India |
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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. |
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Keywords: | |
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