A. M. Kondoz's Digital Speech: Coding for Low Bit Rate Communication PDF

By A. M. Kondoz

ISBN-10: 0470870079

ISBN-13: 9780470870075

Development at the good fortune of the 1st variation Digital Speech bargains vast new, up-to-date and revised fabric established upon the most recent study. This Second Edition maintains to supply the elemental technical heritage required for low bit cost speech coding and the most well liked advancements in electronic speech coding innovations which are appropriate to evolving communique structures.

  • Features new chapters on Pitch Estimation and Voice-Unvoiced type of Speech, Harmonic Speech Coding and Multimode Speech Coding
  • Presents a comprehensively revised bankruptcy entitled Analysis through Synthesis LPC Coding together with particular examples of well known speech coders resembling CELP (Code-Excited Linear Predictive) Coding
  • Contains an up to date bankruptcy on effective LPC Quantization equipment together with MSVQ and anti-aliasing filtering
  • Discusses Voice job Detection (VAD) methods
  • Offers multiplied insurance of speech enhancement strategies equivalent to echo cancellation and noise suppression

Written by way of a well known, hugely revered educational, this authoritative quantity may be necessary to practicing engineers, community designers, desktop scientists and complex scholars in communications, electric and digital engineering.

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Extra resources for Digital Speech: Coding for Low Bit Rate Communication Systems, 2nd Edition

Example text

E. no residual error will be left and, hence, no residual information will need to be transmitted. 9 which may result in 4–7 dB signal reduction before quantization, hence achieving significant increase in quantization performance. 4 Vector Quantization When a set of discrete-time amplitude values is quantized jointly as a single vector, the process is known as vector quantization (VQ), also known as block quantization or pattern-matching quantization. 9. If we assume x = [x1 , x2 , . . 9 Block diagram of a simple vector quantizer superscript T denotes transpose in vector quantization), this vector is matched with another real-valued, discrete-amplitude, N dimensional vector y.

53) It can be seen from the above expressions that the computation and storage requirements of a full search codebook are exponentially related to the number of bits in the codewords. For a 16-bit fixed point processor the storage Mfs in bytes is given by 2 × Mfs and for a 32-bit floating point implementation, storage is 4 × Mfs . In general, the storage is defined by the required number of words each corresponding to a location. For example if N = 10 and R = 1 the number of codebook vectors L will be 2NR = 1024.

Comm, pp. 1610–13. Amsterdam [8] M. Schroeder and B. Atal (1985) ‘Code excited linear prediction (CELP): high quality speech at very low bit rates’, in Proc. of Int. Conf. , Speech and Signal Processing, pp. 937–40. 7. September 1991. Digital Voice Systems Inc. [10] J. C. 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.

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

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