Ninth International Conference on Spoken Language Processing

Pittsburgh, PA, USA
September 17-21, 2006

Two Stage Transform Vector Quantization of LSFs for Wideband Speech Coding

Saikat Chatterjee, T. V. Sreenivas

Indian Institute of Science, India

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.

Full Paper

Bibliographic reference.  Chatterjee, Saikat / Sreenivas, T. V. (2006): "Two stage transform vector quantization of LSFs for wideband speech coding", In INTERSPEECH-2006, paper 1433-Mon1FoP.8.