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RIESZ-TRANSFORM-BASED DEMODULATION OF NARROWBAND SPECTROGRAMS OF VOICED SPEECH

Aragonda, Haricharan and Seelamantula, Chandra Sekhar (2013) RIESZ-TRANSFORM-BASED DEMODULATION OF NARROWBAND SPECTROGRAMS OF VOICED SPEECH. In: IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), MAY 26-31, 2013, Vancouver, CANADA, pp. 8203-8207.

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Official URL: http://dx.doi.org/10.1109/ICASSP.2013.6639264

Abstract

Narrowband spectrograms of voiced speech can be modeled as an outcome of two-dimensional (2-D) modulation process. In this paper, we develop a demodulation algorithm to estimate the 2-D amplitude modulation (AM) and carrier of a given spectrogram patch. The demodulation algorithm is based on the Riesz transform, which is a unitary, shift-invariant operator and is obtained as a 2-D extension of the well known 1-D Hilbert transform operator. Existing methods for spectrogram demodulation rely on extension of sinusoidal demodulation method from the communications literature and require precise estimate of the 2-D carrier. On the other hand, the proposed method based on Riesz transform does not require a carrier estimate. The proposed method and the sinusoidal demodulation scheme are tested on real speech data. Experimental results show that the demodulated AM and carrier from Riesz demodulation represent the spectrogram patch more accurately compared with those obtained using the sinusoidal demodulation. The signal-to-reconstruction error ratio was found to be about 2 to 6 dB higher in case of the proposed demodulation approach.

Item Type: Conference Proceedings
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Additional Information: Copyright for this article belongs to the IEEE, USA
Keywords: Riesz transform; Spectrogram demodulation
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 04 Mar 2014 11:36
Last Modified: 04 Mar 2014 11:36
URI: http://eprints.iisc.ernet.in/id/eprint/48487

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