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Spectral-envelope-group-delay models for transients

Shenoy, Ravi R and Seelamantula, Chandra Sekhar (2013) Spectral-envelope-group-delay models for transients. In: Journal of the Acoustical Society of America, 133 (5). pp. 2788-2802.

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Official URL: http://dx.doi.org/10.1121/1.4798580


Transient signals such as plosives in speech or Castanets in audio do not have a specific modulation or periodic structure in time domain. However, in the spectral domain they exhibit a prominent modulation structure, which is a direct consequence of their narrow time localization. Based on this observation, a spectral-domain AM-FM model for transients is proposed. The spectral AM-FM model is built starting from real spectral zero-crossings. The AM and FM correspond to the spectral envelope (SE) and group delay (GD), respectively. Taking into account the modulation structure and spectral continuity, a local polynomial regression technique is proposed to estimate the GD function from the real spectral zeros. The SE is estimated based on the phase function computed from the estimated GD. Since the GD estimation is parametric, the degree of smoothness can be controlled directly. Simulation results based on synthetic transient signals generated using a beta density function are presented to analyze the noise-robustness of the SEGD model. Three specific applications are considered: (1) SEGD based modeling of Castanet sounds; (2) appropriateness of the model for transient compression; and (3) determining glottal closure instants in speech using a short-time SEGD model of the linear prediction residue.

Item Type: Journal Article
Publication: Journal of the Acoustical Society of America
Publisher: Acoustical Society of America
Additional Information: Copyright of this article belongs to Acoustical Society of America.
Keywords: Acoustic Signal Processing; Audio Signal Processing; Musical Acoustics; Speech Processing
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 21 Jun 2013 04:55
Last Modified: 21 Jun 2013 04:55
URI: http://eprints.iisc.ac.in/id/eprint/46724

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