who safe listening app: review and features · 0.5 time (s) e 40 100 400 1000 4000 10000 0 0.002...
TRANSCRIPT
March 6, 2017
Dr. Michael Buschermöhle, HörTech gGmbH, Oldenburg, Germany
WHO SAFE LISTENING APP: REVIEW AND FEATURES
Founded 2001 in Oldenburg as a non-profit company
Majority stakeholder: University of Oldenburg
Goals:
Interface between science and industry
Development of new methods and expertise
Support of science and research
HörTech is the transfer organization of the Cluster of Excellence Hearing4all
INTRODUCTION OF HÖRTECH GGMBH
MARCH 06, 2017 | WHO SAFE LISTENING APP
Purpose of the app:
Educate users of their recreational listening habits
Give users a feeling for sound level and sound dose
Provide a ball park estimate of the daily sound dose obtained through listening with the mobile device
The app cannot:
Precisely measure the dose
Include other sound sources than the headphones of the mobile device
Measure the sound exposure from other apps on the phone
Prevent users from unsafe listening
WHO SAFE LISTENING APP FOR MOBILE DEVICES
MARCH 06, 2017 | WHO SAFE LISTENING APP
Developed for Android and iOS
Typical music player functionality
Display of daily sound dose based on U.S. Department of Health and Human Services (NIOSH), 1998
Notifications at reaching certain doses (50%, 75%, 90%, and 100%)
Notification at startup
Smart volume: automatic level reduction at higher dose values
Statistics:
Doses of the past days
Today‘s listening time
Average sound level
FEATURES OF THE APP
MARCH 06, 2017 | WHO SAFE LISTENING APP
A QUICK TOUR OF THE APP
MARCH 06, 2017 | WHO SAFE LISTENING APP
HOW DOES IT WORK?
MARCH 06, 2017 | WHO SAFE LISTENING APP
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1.11 1.115 1.12 1.125 1.13 1.135 1.14 1.145 1.15-0.5
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0.006
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frequency (Hz)
spectr
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(a.u
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1.155 1.16 1.165 1.17 1.175 1.18 1.185 1.19-0.5
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0.004
0.006
0.008
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frequency (Hz)
spectr
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(a.u
.) Level: 45.5 dBA
0 0.5 1 1.5 2 2.5 3-0.5
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1.195 1.2 1.205 1.21 1.215 1.22 1.225 1.23 1.235-0.5
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0.004
0.006
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frequency (Hz)
spectr
al pow
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(a.u
.) Level: 63.4 dBA
0 0.5 1 1.5 2 2.5 3-0.5
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dig
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1.24 1.245 1.25 1.255 1.26 1.265 1.27 1.275 1.28-0.5
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0.006
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frequency (Hz)
spectr
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(a.u
.) Level: 69.8 dBA
0 0.5 1 1.5 2 2.5 3-0.5
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dig
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1.285 1.29 1.295 1.3 1.305 1.31 1.315 1.32-0.5
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0.004
0.006
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frequency (Hz)
spectr
al pow
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(a.u
.) Level: 71.2 dBA
0 0.5 1 1.5 2 2.5 3-0.5
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dig
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1.325 1.33 1.335 1.34 1.345 1.35 1.355 1.36 1.365-0.5
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0.004
0.006
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frequency (Hz)
spectr
al pow
er
(a.u
.) Level: 71.3 dBA
0 0.5 1 1.5 2 2.5 3-0.5
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dig
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1.37 1.375 1.38 1.385 1.39 1.395 1.4 1.405-0.5
0
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0.004
0.006
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0.01
frequency (Hz)
spectr
al pow
er
(a.u
.) Level: 70.1 dBA
Dosimetry guidelines are given for the free field. Diffuse field compensation by subtracting transfer function from free field to occluded ear:
Total acoustic energy obtained by summing energy over frequencies, resulting in L free field
BACKGROUND OF DOSE CALCULATION
MARCH 06, 2017 | WHO SAFE LISTENING APP
0 0.5 1 1.5 2 2.5 3-0.5
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dig
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1.37 1.375 1.38 1.385 1.39 1.395 1.4 1.405-0.5
0
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time (s)
dig
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plit
ude
40 100 400 1000 4000 100000
0.002
0.004
0.006
0.008
0.01
frequency (Hz)
spectr
al pow
er
(a.u
.) Level: 70.1 dBA
0 0.5 1 1.5 2 2.5 3-0.5
0
0.5
time (s)
dig
ital am
plit
ude
1.37 1.375 1.38 1.385 1.39 1.395 1.4 1.405-0.5
0
0.5
time (s)
dig
ital am
plit
ude
40 100 400 1000 4000 100000
0.002
0.004
0.006
0.008
0.01
frequency (Hz)
spectr
al pow
er
(a.u
.) Level: 70.1 dBA
Maximum allowed exposure time (in minutes) at level L according to occupational noise exposure guidelines from U.S. Department of Health and Human Services (NIOSH, 1998):
OBTAINING THE DOSE FROM THE LEVELS
MARCH 06, 2017 | WHO SAFE LISTENING APP
Partial dose at level L
The app tracks the exposure time EL for each level L.
OBTAINING THE DOSE FROM THE LEVELS
MARCH 06, 2017 | WHO SAFE LISTENING APP
Partial dose at level L
CALIBRATION
MARCH 06, 2017 | WHO SAFE LISTENING APP
In order to realistically estimate the sound pressure levels provided by a range of headphones and handsets, we
measure with rubber ear simulators
calibrate a range of phone volume settings
allow third parties to add headphones and handsets
CALIBRATION
MARCH 06, 2017 | WHO SAFE LISTENING APP
Lattenuation (handset-dependent)
Cheadphone Chandset
So
un
d p
res
su
re le
ve
l (d
B A
)
Volume setting
Measurement of SPLs for different handsets, headphones and volume settings
Pink noise at -18.2 dB digital level
B&K 2610 amplifier, G.R.A.S KEMAR 45BA artificial head, G.R.A.S 42AA Pistonphone
Calibration constants can be added to a database of devices
Device calibration Chandset
Volume attenuation Lattenuation
Headphone calibration Cheadphone
CALIBRATION
MARCH 06, 2017 | WHO SAFE LISTENING APP
So
un
d p
res
su
re le
ve
l (d
B A
)
Volume setting
Apple iPhone 6s
Thanks to everyone involved: • Simon Albani • Thomas Bisitz • Dr. Graham Coleman • Niklas Grunewald • Dr. Joachim Neumann
THANKS FOR YOUR ATTENTION!