3/27/2013
The Distortional Aspect of Sensorineural Hearing Loss: What Can Be Done? Presented by: Donald J. Schum, PhD Moderated by: Carolyn Smaka, Au.D., Editor-in-Chief, AudiologyOnline
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Donald J. Schum, PhD Vice President, Audiology & Professional Relations Oticon, Inc.
[email protected]
Plomp (1986)
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Attenuation plus Distortion
Presbyacusis
Other SNHL
Noise Induced
Plomp, 1986
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Beyond Threshold & Loudness Changes
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Loudness
dB HL
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Studebaker et al., 1999
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Nelson & Turner, 1980
Right Ears
Left Ears
Simon & Yund, 1993
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Arthur et al., 1971
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How big of a gap?
Amplitude
Time
Drullman, Festen & Plomp, 1994
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Yost & Nielsen, 1985
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Noise @ 1000 Hz. Noise Level (dB SPL)
80
Noise Level (dB SPL)
100
100 60
90 90
40 20
80 80 70
0
60
70 60 500 1000 2000 4000 Frequency (Hz.)
1000 2000
4000 8000
Frequency (Hz.)
Frequency (Hz.) 250 500 1000 2000 4000 8000 0
20
dB HL
Intensity (dB SPL)
100
Noise @ 500 Hz.
Region of excessive masking
40
60
80 100
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Frequency (Hz.) 250 500 1000 2000 4000 8000 0
dB HL
20
Masked Normal Quiet SNHL
40
60
Masked SNHL
80 100
1 kHz LP Noise
Intra Speech Masking Frequency (Hz.) 250 500 1000 2000 4000 8000 0
F1 F2 F3
dB HL
20
40
60
Masking Effect
80 100
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Masking Effect Region of Backward Masking
Physical Masker
Region of Forward Masking
Time
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frequency
“pool” “tool”
time
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The Effect: Speech Understanding in Noise
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Broad Band? Narrow Band?
“two weeks later”
t o w ee k s l a
t er
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Target Voice /s/
Competing Voice /s/
Level
Time
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Individual acoustic events must stand out of the clutter well enough to become linked.
The “ah‐ha” Moment
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How Do We Address It Currently?
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Increase the chances of “ah‐ha”
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NAL‐NL2
NAL‐NL2
Voice Aligned Compression
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Importance of HFs on Speech Localization
Best et al., 2005
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Enhanced Audibility with Comfort Decoupling response to vowels from consonants (USOM) Packaging with Care
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The Future?
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Drullman, Festen & Plomp, 1994
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Please jot down how much change I need.
p l ea s j o t d ow n how m u ch
ch
a n ge I n ee
d
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Please jot down how much change I need. p l ea s j o t d ow n how m u ch
ch
a n ge I n ee
d
Donald J. Schum, PhD Vice President, Audiology & Professional Relations Oticon, Inc.
[email protected]
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