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Table 8 Subjective listening test scores.

From: Quality Enhancement of Compressed Audio Based on Statistical Conversion

Preference ratio of enhanced file over 64-kbps file
  95% confidence interval
Rock 0.40 ± 0.27
Electronic 0.50 ± 0.25
Symphony 0.47 ± 0.26
Jazz 0.46 ± 0.27
Flute 0.53 ± 0.25
Violin 0.44 ± 0.23
Bass 0.46 ± 0.27
Piano 0.47 ± 0.24
Harp 0.54 ± 0.27
Drums 0.56 ± 0.23
  1. Preference ratios (normalized to a maximum value of 1) of the enhanced file over the 64-kbps MP3 file along with the 95% confidence intervals, for the case of 32-kbps MP3 enhancement. The enhanced file is always preferred over the 32 kbps MP3 file for all signals.