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Table 5 The effects on the three component ECVQs and coding gains

From: A memory efficient finite-state source coding algorithm for audio MDCT coefficients

Pyramidal Threshold ECVQ_D4 ECVQ_D2 ECVQ_D1 Gains (%)
decomposition T b d T a c Ratio (%) LSB (%) Ratio (%) LSB (%) Ratio (%) LSB (%)  
Ω 4 a 9 30 77.395 1.403 16.769 1.873 5.837 9.883 3.0626
  10   79.276 1.623 14.895 2.075 5.830 9.895 2.9917
  12   82.300 2.104 11.884 2.501 5.816 9.914 2.7091
  17   82.517 2.159 11.669 2.529 5.814 9.916 2.6779
  24   83.410 2.403 10.785 2.673 5.805 9.925 2.5094
    87.733 4.947 7.728 2.672 4.539 10.129 0.9096
  10 24 78.733 1.579 15.436 2.014 5.832 9.892 3.0123
   27 78.836 1.588 15.333 2.025 5.831 9.893 3.0094
   33 79.520 1.645 14.651 2.105 5.829 9.896 2.9834
   36 79.606 1.654 14.566 2.117 5.829 9.896 2.9812
   81.651 1.917 12.624 2.363 5.725 10.062 2.7537
Ω 2 b 32 243 79.276 1.623 13.849 1.647 6.875 8.455 2.9771
  45     14.542 1.880 6.183 9.363 3.0022
  67     15.219 2.241 5.505 10.443 2.9449
  75     15.496 2.436 5.228 10.950 2.8997
      17.364 6.231 3.360 12.663 1.4433
  65 189 79.276 1.623 14.727 2.021 5.997 9.634 2.9563
   216    14.776 2.036 5.948 9.707 2.9535
   249    14.922 2.085 5.802 9.941 2.9929
   257    14.942 2.098 5.782 9.972 2.9916
      15.537 2.548 5.817 10.975 2.8963
  1. aSet the thresholds of Ω2 to be T bd = 65, T ac = 243; bset the thresholds of Ω4 to be T bd = 10, T ac = 30. Meanwhile, the main FSVQ is of different thresholds in 24 kbps stereo.