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Table 4 Spectral dynamics and spectral distortion of matrix quantization versus vector quantization at the same rate.

From: Very Low Rate Scalable Speech Coding through Classified Embedded Matrix Quantization

Average number of bits per segment of four frames 43 38 33
ASE for original speech 6.57 6.57 6.57
ASE for MQ 6.21 6.15 6.11
ASE for MQ with segments junction smoothing 6.08 6.02 5.97
ASE for VQ at the same rate as MQ 6.56 6.54 6.43
ASD for MQ 1.65 1.75 2.05
ASD for MQ with segments junction smoothing 1.63 1.72 2.01
ASD for VQ at the same rate as MQ 2.50 2.68 3.02