Very low rate speech coding using temporal decomposition

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Very low rate speech coding using temporal decomposition

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Published

A method for encoding the spectral characteristics of speech, at rates below 180 bit/s, using hierarchical temporal decomposition (HTD) is proposed. A set of the log-area-ratio (LAR) parameters, extracted from a given block of speech, are approximated through Gaussian interpolation between the most-steady frames detected by the HTD. This results in a smaller set of parameters which are encoded using vector quantisation. It is shown that the same spectral distortion is obtained with the new coder at a rate of 180 bit/s as that using a scalar quantisation, TD-based coder, at 600 bit/s.

Inspec keywords: interpolation; Gaussian processes; speech coding; vector quantisation

Other keywords: log-area-ratio parameters; spectral distortion; most-steady frames; Gaussian interpolation; speech coding; hierarchical temporal decomposition; 0 to 180 bit/s; spectral characteristics; vector quantisation

Subjects: Codes; Interpolation and function approximation (numerical analysis); Speech and audio coding

References

    1. 1)
      • Ghaemmaghami, S., Deriche, M., Sridharan, S.: `Hierarchical temporal decomposition: A novel approach to efficient compressionof spectral characteristics of speech', Int. Conf. Spoken Language Proc. ICSLP '98, 1998, 6, p. 2567–2570.
    2. 2)
      • Y.M. Cheng , D. O'Shaughnessy . Short-term temporal decomposition and its properties for speech compression. IEEE, Trans. , 6 , 1282 - 1290
    3. 3)
      • Atal, B.S.: `Efficient coding of LPC parameters by temporal decomposition', , Proc. ICASSP 83, 1983, p. 81–84.
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