Acoustic Model Evaluation

LM: 20K 75-month cutoff-1-1

Male mix.4 mix.8 mix.16

GD monophone 75.3 79.6 83.9

GI monophone 68.3 78.0 81.7

GD triphone 2000 92.0 92.6 94.3

GI triphone 2000 89.3 91.8 92.5

GD PTM 129x64 92.4

GI PTM 129x64 89.5

Female mix.4 mix.8 mix.16

GD monophone 75.5 80.7 88.9

GI monophone 76.0 80.8 84.7

GD triphone 2000 92.0 94.4 95.2

GI triphone 2000 92.3 93.4 94.8

GD PTM 129x64 94.6

GI PTM 129x64 94.3

• Monophone needs many mixture components
• Accuracy is almost saturated for triphone
• PTM realizes comparable performance with much fewer parameters
• Gender-Independent model increases error rate