Wideband speech coding in 7.2 kb/s

  • Authors:

  • C. McElroy;B. Murray;A. D. Fagan

  • Affiliations:

  • Department of Electrical and Electronic Engineering, University College, Dublin, Ireland;Department of Electrical and Electronic Engineering, University College, Dublin, Ireland;Department of Electrical and Electronic Engineering, University College, Dublin, Ireland

  • Venue:
  • ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: speech processing - Volume II
  • Year:
  • 1993

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Abstract

A new method for coding wideband speech at medium bit rates is proposed. A sub-band approach is adopted, using sharp cut-off filters to split the speech into lower and upper bands. This allows the upper band to be very coarsely quantized without introducing significant distortion at low Pequencies in the reconstructed speech, which would normally occur using short QMF filters. A standard CELP coder is used for the low frequency band, and the upper band is quantized using a 2nd order predictor and gain shape vector quantization at 0.05 bits per sample, yielding an overall bit rate of 7.2 kbh. The overall efect is to produce a wideband coder that has almost the same computational requirements as a narrowband CELP coder and only a slight increase in the bit rate.