Digital Speech, 2nd Edition: Coding for Low Bit Rate by A. M. Kondoz PDF

By A. M. Kondoz

ISBN-10: 0470870079

ISBN-13: 9780470870075

Construction at the good fortune of the 1st version electronic Speech bargains vast new, up-to-date and revised fabric dependent upon the newest examine. This moment variation maintains to supply the elemental technical historical past required for low bit price speech coding and the most well liked advancements in electronic speech coding innovations which are appropriate to evolving communique structures. Written through a well known, hugely revered educational, this authoritative quantity might be valuable to training engineers, community designers, laptop scientists and complex scholars in communications, electric and digital engineering.

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Additional info for Digital Speech, 2nd Edition: Coding for Low Bit Rate Communication Systems

Example text

Usually, y is chosen from a finite set of values Y = yi , 1 ≤ i ≤ L, where yi = [yi1 , yi2 , . . , yiN ]T . The set Y is called the codebook or reference templates where L is the size of the codebook, and yi are the codebook vectors. The size of the codebook may be considered to be equivalent to the number of levels in a scalar quantizer. In order to design such a codebook, N dimensional space is partitioned into L regions or cells Ci , 1 ≤ i ≤ L and a vector yi is associated with each cell Ci .

Hardwick and J. S. Lim (1991) ‘The application of the IMBE speech coder to mobile communications’, in Proc. of Int. Conf. , Speech and Signal Processing, pp. 249–52. [11] W. B. Kleijn (1993) ‘Encoding speech using prototype waveforms’, in IEEE Trans. Speech and Audio Processing, 1:386–99. [12] E. Shlomot, V. Cuperman, and A. Gersho (1998) ‘Combined harmonic and waveform coding of speech at low bit rates’, in Proc. of Int. Conf. , Speech and Signal Processing. [13] J. Stachurski and A. McCree (2000) ‘Combining parametric and waveform-matching coders for low bit-rate speech coding’, in X European Signal Processing Conf.

This method requires the transmission of the speech block variances to the de-quantizer for correct signal amplitude adjustment. In order to make the normalization and de-normalization compatible, a quantized version of the speech rms, σx , is used at both the quantizer and the de-quantizer. info 34 Sampling and Quantization Quantizer x(n) . 4 Block diagram of a forward adaptive quantizer Another adaptation scheme which does not require transmission of the speech variance to the de-quantizer is called backward adaptation.

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Digital Speech, 2nd Edition: Coding for Low Bit Rate Communication Systems by A. M. Kondoz


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