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Two Stage Transform Vector Quantization of LSFs for Wideband Speech Coding

Chatterjee, Saikat and Sreenivas, TV (2006) Two Stage Transform Vector Quantization of LSFs for Wideband Speech Coding. In: 9th International Conference on Spoken Language, 2006, Pittsburgh, PA, pp. 233-236.

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Official URL: http://www.isca-speech.org/archive/interspeech_200...


We investigate the use of a two stage transform vector quantizer (TSTVQ) for coding of line spectral frequency (LSF) parameters in wideband speech coding. The first stage quantizer of TSTVQ, provides better matching of source distribution and the second stage quantizer provides additional coding gain through using an individual cluster specific decorrelating transform and variance normalization. Further coding gain is shown to be achieved by exploiting the slow time-varying nature of speech spectra and thus using inter-frame cluster continuity (ICC) property in the first stage of TSTVQ method. The proposed method saves 3-4 bits and reduces the computational complexity by 58-66%, compared to the traditional split vector quantizer (SVQ), but at the expense of 1.5-2.5 times of memory.

Item Type: Conference Paper
Publisher: ISCA-International Speech Communication Association
Additional Information: Copyright for this article belongs to ISCA-International Speech Communication Association.
Keywords: Vector Quantization; LSF Coding
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 08 Jan 2010 05:55
Last Modified: 08 Jan 2010 05:55
URI: http://eprints.iisc.ac.in/id/eprint/24233

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