Spectral zero-crossings: localization properties and application to epoch extraction in speech signals

Shenoy, Ravi R and Seelamantula, Chandra Sekhar (2012) Spectral zero-crossings: localization properties and application to epoch extraction in speech signals. In: 2012 International Conference on Signal Processing and Communications (SPCOM), 22-25 July 2012, Bangalore, Karnataka, India.

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Abstract

We analyze the spectral zero-crossing rate (SZCR) properties of transient signals and show that SZCR contains accurate localization information about the transient. For a train of pulses containing transient events, the SZCR computed on a sliding window basis is useful in locating the impulse locations accurately. We present the properties of SZCR on standard stylized signal models and then show how it may be used to estimate the epochs in speech signals. We also present comparisons with some state-of-the-art techniques that are based on the group-delay function. Experiments on real speech show that the proposed SZCR technique is better than other group-delay-based epoch detectors. In the presence of noise, a comparison with the zero-frequency filtering technique (ZFF) and Dynamic programming projected Phase-Slope Algorithm (DYPSA) showed that performance of the SZCR technique is better than DYPSA and inferior to that of ZFF. For highpass-filtered speech, where ZFF performance suffers drastically, the identification rates of SZCR are better than those of DYPSA.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright of this article belongs to IEEE.
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	02 Jul 2013 06:48
Last Modified:	02 Jul 2013 06:48
URI:	http://eprints.iisc.ac.in/id/eprint/46535

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