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.
Samples | MP3 | AAC | ATFT | |||
|---|---|---|---|---|---|---|
| Â | 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 |