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 IR T,6ch. IR M,6ch. Background Sound : daily practice : before a concert Evaluation Score 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 Evaluation Score 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 Loudness score (7-step category) 1 2 3 4 5 6 7 20 30 40 50 60 70 80 90 100 110 Loudness score (7-step category) LL Z [phons] R=0.991 LL M [phons] 20 30 40 50 60 70 80 90 110 100 1 2 3 4 5 7 6 R=0.988 LL Z LL M Wind turbine noise Public space No vibration absorbers Pattern1 Pattern2 Pattern3 Development of sound insulation performance of double-layer wall using vibration absorbers