Table 3 Effect of feature transformation on overall 
-measure (%) of detector HMMs without acoustic model adaptation.
-measure (%) of detector HMMs without acoustic model adaptation.From: Drum Sound Detection in Polyphonic Music with Hidden Markov Models
| Â | none | PCA 90% | LDA |
|---|---|---|---|
Plain drums | 63.6 | 66.0 | 79.1 |
Balanced mix | 59.6 | 60.9 | 73.5 |