dB

120

100

80

50

40

20

0

10 20 50 100 200 500 1000 2000 5000 10“ 20“ 50“ 100“

Perception threshold

Music

Speech

Field of audibility

W/m2

102

1

10-2

10-4

10-6

10-8

10-10

10-12

Hz

< 20 dB Free open space, calm

20-30 dB A very quiet room

30-40 dB Usual background noise in the house

40-50 dB A normal conversation

50-60 dB Normal volume of entertainment electronics

60-70 dB Keyboard noises

70-80 dB Car in city traffic

80-90 dB Truck in city traffic

90-100 dB Pneumatic hammer

100-110 dB Pop concert

110-120 dB Jet aircraft in test run

120-130 dB Jet aircraft at take-off

130-140 dB Close-up explosion of Firerecracker

Audibility threshold technically difficult to measure;

practically not to be found in towns

Audibility threshold measurable, no influences on the

ability to concentrate

Sleeping disturbances possible

Affects the ability of others to concentrate

Normal conversation requires raised voice

Vegetative disturbances and decline in performance

Increased vegetative disturbances at frequent exposure

Longer exposure is no longer tolerable

Ear muffs / protective gear required

Oncoming damage to hearing

Pain barrier

Physical damage to hearing

Acute, irreversible damage,

also with short-time exposure

TCEFFEESION

< IN

CREA

SING

DEGR

EE O

F DAM

AGE

ceiling

wall / partition

ceiling200 mm(as per BS ENISO 11654)

α

Prac

tical

sou

nd a

bsor

ptio

n (

p)

frequency f (Hz)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0.400.50

0.55

0.70 0.650.45

Prac

tical

sou

nd a

bsor

ptio

n (

p)

frequency f (Hz)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0,350,400,50

0,70 0,750,60

α α

Prac

tical

sou

nd a

bsor

ptio

n (

p)

frequency f (Hz)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0.250.30

0.10 0.10 0.10 0.10

Prac

tical

sou

nd a

bsor

ptio

n (

p)frequency f (Hz)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0.400.40

0.55

0.700.60

0.45

α α

frequency f (Hz)

Prac

tical

sou

nd a

bsor

ptio

n (

p)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0.200.35

0.10 0.05 0.05 0.05Pr

actic

al s

ound

abs

orpt

ion

( p)

frequency f (Hz)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0.350.35

0.600.75 0.70

0.45

α α

Prac

tical

sou

nd a

bsor

ptio

n (

p)

frequency f (Hz)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0.400.450.50

0.70 0.70 0.65

Prac

tical

sou

nd a

bsor

ptio

n (

p)frequency f (Hz)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0.400.450.50

0.700.80 0.75

αα

Prac

tical

sou

nd a

bsor

ptio

n (

p)frequency f (Hz)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0.75

0.55

0.75 0.80

0.951.00

α

Prac

tical

sou

nd a

bsor

ptio

n (

p)frequency f (Hz)

0.74

125 250 500 1000 2000 4000

1.0

0.8

0.6

0.4

0.2

0

0.85

0.60

0.85 0.901.00 1.00

α