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Table 2 PER [%] for MFCC-based system for progressively refined AM

From: Advanced acoustic modelling techniques in MP3 speech recognition

Data Baseline LDA SAT SGMM MMI
Raw 17.8 15.9 12.3 10.3 7.3
128k 18.9 17.2 13.7 10.8 8.1
32k 20.9 17.9 13.6 11.3 8.7
28k 24.6 19.5 14.3 11.9 9.4
24k 33.9 25.9 16.4 13.5 11.4
20k 47.1 31.9 19.0 15.6 13.6
16k 62.2 49.4 25.8 20.4 18.7
12k 73.0 68.7 46.0 32.6 30.2