Spectral-envelope and group-delay models for transient signals—applications to castanets and stop consonants

Shenoy, Ravi R and Seelamantula, Chandra Sekhar (2011) Spectral-envelope and group-delay models for transient signals—applications to castanets and stop consonants. In: 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 22-27 May 2011, Prague.

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Abstract

We present a novel approach to represent transients using spectral-domain amplitude-modulated/frequency -modulated (AM-FM) functions. The model is applied to the real and imaginary parts of the Fourier transform (FT) of the transient. The suitability of the model lies in the observation that since transients are well-localized in time, the real and imaginary parts of the Fourier spectrum have a modulation structure. The spectral AM is the envelope and the spectral FM is the group delay function. The group delay is estimated using spectral zero-crossings and the spectral envelope is estimated using a coherent demodulator. We show that the proposed technique is robust to additive noise. We present applications of the proposed technique to castanets and stop-consonants in speech.

Item Type:	Conference Proceedings
Publisher:	IEEE
Additional Information:	Copyright of this article belongs to IEEE.
Keywords:	AM-FM Model; Coherent Demodulation; Group Delay Estimation; Spectra-Domain Zero-Crossings; Spectral Envelope
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	19 Apr 2013 09:02
Last Modified:	19 Apr 2013 09:02
URI:	http://eprints.iisc.ac.in/id/eprint/46225

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