EURASIP Journal on Audio, Speech, and Music Processing

Table 11 Likelihood scores (Negative log likelihood per frame) and Correct recognition percentages of all the phonemes (see Figures 6 and 7).

From: Ageing Voices: The Effect of Changes in Voice Parameters on ASR Performance

Phoneme	Negative Log Likelihood				Correct (%)
	Adult		Older		Adult	Older
	Mean	Std	Mean	Std
aa	65.7	7.1	67.0	7.1	67.5	52.8
ae	66.9	6.9	67.7	7.2	53.2	41.5
ah	68.0	6.0	69.2	6.7	56.8	59.3
ao	66.7	6.7	67.9	6.9	69.3	58.6
aw	65.5	6.1	66.2	6.7	73.2	57.5
ax	67.3	5.9	68.6	6.2	46.6	46.8
ay	66.1	7.0	66.6	7.2	76.1	73.9
b	66.0	6.2	67.8	7.4	67.5	68.0
ch	66.4	5.9	67.3	5.4	76.2	73.3
d	67.7	6.1	69.1	6.7	48.3	50.3
dh	67.4	5.7	69.2	6.1	61.2	60.8
eh	66.7	6.5	67.3	7.0	54.7	54.8
er	66.0	6.4	67.8	6.8	67.8	57.6
ey	63.3	6.6	64.4	6.9	79.3	78.4
f	62.4	5.8	64.4	6.3	83.8	79.4
g	68.2	5.9	70.2	6.1	67.9	73.3
hh	67.8	6.0	69.7	6.5	70.3	59.5
ih	67.8	6.1	68.7	6.3	50.7	49.2
iy	65.7	6.5	66.3	6.9	74.0	71.6
jh	68.0	5.2	68.8	5.6	73.1	67.7
k	67.1	5.7	69.4	6.5	69.7	70.1
l	66.9	6.2	68.7	7.0	64.3	60.2
m	65.2	6.2	67.2	6.7	76.2	73.1
n	66.5	6.3	67.6	6.7	65.7	61.7
ng	65.8	6.1	67.3	6.8	78.1	72.6
ow	67.3	6.6	68.4	7.2	67.8	70.4
oy	67.7	5.4	67.8	5.3	82.4	81.9
p	64.8	5.5	66.2	6.3	72.3	70.6
r	67.5	6.5	68.5	6.9	64.0	60.1
s	64.8	5.9	66.4	6.5	80.1	80.1
sh	62.4	5.8	63.6	6.0	82.1	83.8
t	67.5	6.2	69.0	6.8	41.3	37.1
th	66.1	6.3	68.4	6.6	54.4	50.0
uh	69.6	6.2	70.2	6.5	74.4	74.5
uw	65.7	6.5	67.8	7.2	69.9	68.7
v	64.9	5.8	66.0	6.2	63.9	62.2
w	67.5	6.2	68.9	7.1	81.1	79.0
y	66.7	6.6	68.1	7.0	78.5	77.7
z	66.6	5.7	68.0	6.0	72.4	68.0
zh	64.3	5.8	66.1	6.5	80.2	80.0

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