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Table 1 Compression ratio (CR) and subjective difference grades (SDGs). MP3: Moving Picture Experts Group I Layer 3, MPEG-4 AAC: Moving Picture Experts Group 4 Advanced Audio Coding, VBR Main LTP profile, and ATFT: Adaptive Time-Frequency Transform.

From: Audio Signal Processing Using Time-Frequency Approaches: Coding, Classification, Fingerprinting, and Watermarking

Samples MP3 AAC ATFT
  CR SDG CR SDG CR SDG
ACDC 7.5 0.067 9.3 −0.067 8.4 −0.93
DEFLE 7.7 −0.2 9.5 −0.067 8.3 −1.73
ENYA 9 0 9.6 −0.133 20.6 −0.8
HARP 11 −0.067 9.4 −0.067 36.3 −1
HARPSICHORD 8.5 −0.067 10.2 0.33 9.3 −0.73
PIANO 13.6 0.067 9.6 −0.2 40 −0.8
TUBULARBELL 8.3 0 10.1 0.067 10.5 −0.53
VISIT 8.4 −0.067 11.5 0 11.6 −2.27
AVERAGE 9.3 −0.03 9.9 −0.02 18.3 −1.1