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Age-WEIGHTED SOUND LEVELS. Michael A. Staiano 10 July 2006 STAIANO ENGINEERING, INC. ANNOYANCE RESPONSE. Public opinion polling of community annoyance Ambient noise survey of canvassed area. ANNOYANCE RESPONSE CURVE. WEIGHTING CURVES. EQUAL-LOUDNESS CONTOURS. - PowerPoint PPT Presentation
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STAIANO ENGINEERING, INC.
Age-WEIGHTEDSOUND LEVELS
Michael A. Staiano
10 July 2006
STAIANO ENGINEERING, INC.
2STAIANO ENGINEERING, INC.
ANNOYANCE RESPONSE
• Public opinion polling of community annoyance
• Ambient noise survey of canvassed area
3STAIANO ENGINEERING, INC.
ANNOYANCE RESPONSE CURVE
4STAIANO ENGINEERING, INC.
WEIGHTING CURVES
5STAIANO ENGINEERING, INC.
EQUAL-LOUDNESS CONTOURS
Pure-tone response of 18-25-yr-old
men and women
6STAIANO ENGINEERING, INC.
POPULATION PYRAMID
7STAIANO ENGINEERING, INC.
2006 U.S. POPULATION
MEAN AGE:
• Men and Women / All ages – 37 yr
• Men and Women / ≥ 20 yr – 47 yr
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HEARING LOSS
• PRESBYCUSIS—aging
• NOISE-INDUCED▫ occupational▫ sociacusis (every-day life)
• NOSOACUSIS—disease, trauma, ototoxic drugs
9STAIANO ENGINEERING, INC.
EXPECTED HEARING LOSS
60-yr olds in industrial society but not exposed to workplace noise (OSHA 1983)
10STAIANO ENGINEERING, INC.
HEARING LOSS AGE-CORRECTION CURVES
Hearing threshold re 20-yr-old males
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AGE WEIGHTINGS
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SIMPLE SPECTRA
13STAIANO ENGINEERING, INC.
OVERALL SOUND LEVELS of SIMPLE SPECTRA—1
DESCRIPTOR OVERALL 16-10k Hz SOUND LEVEL (dB)
for Spectrum Slope (dB/octave)
-6 -3 0 3
Lp 80 72 63 60
LC 77 70 62 59
LA 60 60 60 60
LAge40 60 59 57 55
LAge50 60 59 57 53
LAge60 60 59 56 52
LAge70 62 60 56 51
14STAIANO ENGINEERING, INC.
OVERALL SOUND LEVELS of SIMPLE SPECTRA—2
DESCRIPTOR OVERALL 16-10k Hz SOUND LEVEL (dB re LA )
for Spectrum Slope (dB/octave)
-6 -3 0 3
Lp 20 12 3 0
LC 17 10 2 -1
LAge40 0 -1 -3 -5
LAge50 0 -1 -3 -7
LAge60 0 -1 -4 -8
LAge70 2 0 -4 -9
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REAL SPECTRA
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OVERALL SOUND LEVELS of REAL SPECTRA—1
DES. OVERALL 25-10k Hz SOUND LEVEL (dB)
IdlingLoco
Light-Rail
Vehicle
WheelSqueal
UrbanTraffic
High-way
Traffic
MilitaryAircraft
RooftopChiller
Sm.Cooling Tower
Lp 84 86 99 84 83 108 62 82
LC 83 86 99 83 82 108 61 82
LA 69 82 95 71 76 104 55 72
LAge40 68 81 93 70 76 103 54 72
LAge50 68 81 93 70 76 103 54 72
LAge60 69 81 93 70 76 103 54 73
LAge70 70 81 93 71 76 104 54 74
17STAIANO ENGINEERING, INC.
OVERALL SOUND LEVELS of REAL SPECTRA—2
DES. OVERALL 25-10k Hz SOUND LEVEL (dB re LA)
IdlingLoco
Light-Rail
Vehicle
WheelSqueal
UrbanTraffic
High-way
Traffic
MilitaryAircraft
RooftopChiller
Sm.Cooling Tower
Lp 15 4 4 13 7 4 8 10
LC 14 3 4 12 6 4 7 9
LAge40 0 -1 -1 -1 -1 -1 -1 0
LAge50 0 -1 -2 -1 0 0 -1 0
LAge60 0 -1 -2 -1 0 0 -1 0
LAge70 2 -1 -2 0 0 1 -1 2
18STAIANO ENGINEERING, INC.
NATURAL SOUNDS
• Natural Sources:▫ Birds ≥ 2 kHz▫ Insects – cicadas ~1 kHz
– crickets ~6 kHz
• Ageing filters natural sounds relative to intruding noise?
19STAIANO ENGINEERING, INC.
CONCLUSION
• A-weighting ageing error range: ~ 1 dB @ 40 yr~ 2 dB @ 50 yr~ 3 dB @ 60 yr~ 4 dB @ 70 yr
• Ageing relatively minor explanation for annoyance response variation