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Reconstruction error distortion measure for quantisation of LPC models

Reconstruction error distortion measure for quantisation of LPC models

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A new distortion measure is proposed for the quantisation of an LPC model. It has a time-domain interpretation, entirely different from that of conventional distortion measures, such as spectral distortion and likelihood ratio. Experimental results indicate that five bit/frame may be gained, without loss of quality.

Inspec keywords: speech coding; linear predictive coding; vector quantisation; signal reconstruction

Other keywords: speech coding; time-domain interpretation; quantisation; bits/frame; quality; reconstruction error distortion measure; LPC models

Subjects: Codes; Speech and audio signal processing

References

    1. 1)
      • J.S. Erkelens , P.M.T. Broersen . Equivalent distortion measures forquantisation of LPC model. Electron. Lett. , 31
    2. 2)
      • W.R. Gardner , B.D. Rao . Theoretical analysis of the high rate vectorquantization of LPC parameters. IEEE Trans. Signal Process. , 5 , 367 - 381
    3. 3)
      • Hedelin, P.: `Single stage spectral quantization at 20 bits', Proc. IEEE Int. Conf. Acoust., Speech, Signal Process., 1994, p. I 525–I 528.
    4. 4)
      • K.K. Paliwal , B.S. Atal . Efficient vector quantization of LPC parametersat 24 bits/frame. IEEE Trans. Signal Process. , 1 , 3 - 14
    5. 5)
      • A.H. Gray , J.D. Markel . Distance measures for speech processing. IEEE Trans. Acoust. Signal Speech Process. , 5 , 380 - 391
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