Transform coding at 4.8kbits/sec using interleaving of transform frames and dual gain-shape vector quantisation

  • Authors:

  • P. M. McCourt;H. A. Kaouri

  • Affiliations:

  • Department of Electrical and Electronic Engineering, The Queen's University of Belfast, Belfast, Northern Ireland;Department of Electrical and Electronic Engineering, The Queen's University of Belfast, Belfast, Northern 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

The performance of transform based coding schemes relies on the adaptive control of coefficient quantisation. Dual Gain-Shape VQ extends interband allocation of quantisation resources, based on sub-band power distributions, to include intra-band bit re-allocation. This makes better use of limited bit resources at low coding rates, and by introducing 2 levels of coefficient normalisation, permits the design of more efficient VQ codebooks. Interleaving of frames in the transform domain prior to encoding, essentially creating a frame overlap, provides an implicit frame interdependence in bit allocations. Implementing both approaches achieves a 1dB improvement in coding performance, producing discernible enhancements in subjective quality.