weighting of acoustic cues shifts to frication duration in identification of fricatives/affricates...
DESCRIPTION
K. Yasu, T. Arai, K. Kobayashi and M. Shindo, “Weighting of acoustic cues shifts to frication duration in identification of fricatives/affricates when auditory properties are degraded due to aging,” In Proc. of the Interspeech, 3152−3156, Lyon, 2013.TRANSCRIPT
Weighting of acoustic cues shifts to frication duration in identification of fricatives/affricates when auditory
properties are degraded due to aging
Keiichi Yasu, Takayuki Arai, Kei Kobayashi, Mitsuko Shindo
Sophia University
2013/08/29 1
Degradation of auditory property by aging
• Difficulty in consonant identification by elderly people
• Degradation of auditory property is one of the causes
– Elevation of hearing levels
– Deficit of temporal resolution
– Loudness recruitment
• And so on.
2013/08/29 2
Identification of fricative and affricate (CV)
• Extending total duration of fricatives (T)
→ Identification shifts from affricates to fricatives.
• (Howell and Rosen, 1983; Kluender and Walsh, 1992)
2013/08/29 3
T (ms)
60 80 100 120 140 160 180 200
# 1 2 3 4 5 6 7 8
Gradient of amplitude of frication: ⊿ Total duration of frication: TYoung Elderly
Identification of fricative and affricate (VCV)
• Extending silent interval (SI) between V1 and C-> Identified from fricative to affricate
– (Dorman et al.,1980; Gordon-Salant et al., 2006)
2013/08/29 4
SI (ms) 0 20 40 60 80 100
# 1 2 3 4 5 6
Total duration of frication: T Silent interval: SIYoung Elderly
Weighting shift
• Multiple cues exists:– Longer T tend to perceived as fricative– Shorter SI tend to perceived as fricative
– Shorter T tend to perceived as affricate– Shorter SI tend to perceived as fricative
• Confusing condition– Depends on listeners perception– Weighting of cues shifts especially for elderly
listeners (Yasu et al. 2011, 2012)
2013/08/29 5
cue-trading(Repp et al. 1978)
typical consonant
Goal
• Identification tests of fricative and affricate
– Degradation of auditory property by aging
• (Yasu et al., 2011, 2012, Gordon-Salant et al., 2006)
• The weighting of acoustic cues
– Re-analysis and discussing in this study
• Weighting Shift to Total duration of frication T
– Unified in different cues in CV and VCV stimuli in simple framework
2013/08/29 6
Experiments(Yasu et al. 2011, 2012)
• Participants– 19 young listeners and 55 elderly listeners – Auditory property measurement for elderly listeners
• Absolute threshold (f), temporal resolution (t), loudness recruitment (r)
• Stimuli– Continuum of CV (changing gradient of amplitude
and T) – Continuum of VCV (changing SI and T)
• Procedure– 2AFC
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Result of CV: Gradient and T
2013/08/29 8
Res
po
nse
rat
e o
f [
∫ ]
1.0
0.5
0
Gradient of frication
1.0
0.5
0 2080
140
200
T (ms)
Phonetic boundary
Phonetic boundary (p=0.5) in CV
2013/08/29 9
Gra
die
nt
of
fric
atio
n
T (ms)
1.0
0.5
00 100 200
Eftr
Weighting shift from gradientto frication duration T
• Elderly listeners with a degradation in auditory properties are less influenced by the gradient of the amplitude of frication
• Aging and degradation of auditory properties affect cue trading
2013/08/29 10
Group Y E Eftr
θ [deg] 85.2 90.8 89.5
Angle θ [deg] at phonetic boundary
Result of VCV: SI and T
2013/08/29 11
Res
po
nse
rat
e o
f [
∫ ]
1.0
0.5
0
T (ms)SI (ms)
0
short
middle
long
3060
90
Phonetic boundary
Phonetic boundary (p=0.5) in VCV
2013/08/29 12T (ms)
SI(m
s)
0short middle long
50
100
Weighting shift from SIto frication duration T
• Elderly people with auditory degradations tend to clue into frication duration T, increasingly as the auditory degradations complete, rather than SI
2013/08/29 13
Group Y E Eftr
θ [deg] 30.1 25.3 80.5
Angle θ [deg] at phonetic boundary
General discussion and conclusion
• Weighting shifts to the total duration of frication (T) by aging
– CV: gradient of frication(⊿) to total duration (T)
– VCV: silent interval (SI) to total duration (T)
• Possible to unify into single framework-> Total duration of frication
– for identification of fricative and affricate
2013/08/29 14
Acknowledgment:Sophia University Open Research Center from MEXT, Japan