Institute of Industrial Science

SAKAMOTO LAB. ［Development of technologies for quiet

and comfortable environment］

Advanced Mobility Research Center

http://www.acoust.iis.u-tokyo.ac.jp

Applied Acoustic Engineering

Development of technologies for quiet and comfortable environment Acoustic laboratory（Ce-101, Ce-B01）

Department of Architecture, Graduate school of Engineering

Welcome to aural demonstration using

sound field simulator!

Development of technologies for quiet and comfortable environment

◆Development of prediction methods：Numerical analysis ◆Room acoustic design：Auditorium, Music practice room, Open-type classrooms ◆Acoustic measurement：Sound propagation, Sound insulation and absorption ◆Development of sound field simulation：6 channel recording-reproduction system ◆Subjective evaluation：Concert halls, Living environments, Public spaces, Offices, other small spaces such as a car cabin

Our laboratory treats various acoustical issues about development of technologies for quiet and comfortable environment. Method of evaluating of acoustical environment and techniques of control and prediction of sound will be introduced.

Acoustical performance of music practice room

Sound masking system for speech privacy

IRT,6ch.

IRM,6ch.

Background Sound

: daily practice : before a concert

Eval

uatio

n Sc

ore

100

80

60

40

20

0 0.20 0.26 0.35 0.46 0.61 0.80

Experimental condition (Reverberation time [s])

Singers : daily practice : before a concert

*Error bars; standard deviation

Eval

uatio

n Sc

ore

100

80

60

40

20

0 0.20 0.26 0.35 0.46 0.61 0.80

Experimental condition (Reverberation time [s])

Woodwinds players

Woodwinds player (Clarinet) Singer (Tenor)

Psycho-acoustical assessment of environmental noise

Loud

ness

sco

re (

7-st

ep c

ateg

ory)

1

2

3

4

5

6

7

20 30 40 50 60 70 80 90 100 110

Loud

ness

sco

re (

7-st

ep c

ateg

ory)

LLZ [phons]

R=0.991

LLM [phons]20 30 40 50 60 70 80 90 110100

1

2

3

4

5

7

6

R=0.988

LLZ LLM

Wind turbine noise

Public space

No vibration absorbers Pattern1

Pattern2 Pattern3

Development of sound insulation performance of double-layer wall using vibration absorbers