Table 1 Sixty-one TIMIT confusion-division results in terms of nine clusters

Cluster 1

bcl dcl epi gcl kcl pau pcl q tcl

Cluster 2

b d dh f g k p t th v

Cluster 3

y

Cluster 4

hh hv

Cluster 5

dx em en m n ng nx

Cluster 6

aa ae ah ao aw ax ax-h axr ay eh el er ey ih ix iy l ow oy r uh uw ux w

Cluster 7

ch jh s sh z zh

Cluster 8

eng

Cluster 9

h#