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| Verification of Sound Insulation Performance |
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The sound insulation measurement (JIS A 1416) is carried out
in the acoustical laboratory consisting of a sound source room, a sound receiving
room, and an opening area (the test specimen mounting frame) linking the sound
source room and the sound receiving room.
Place a layer of test specimen in the opening area, and measure the sound which
has been transmitted through the test specimen from the speaker in the sound source
room to the microphone in the sound receiving room, and then assess the total
sound reduction.
Yoshino Gypsum Co., Ltd. Total Quality Testing Centre
Acoustic Laboratory |
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Yoshino's acoustic laboratory consists of three structures,
"the sound source room", "the sound receiving room", and "the test specimen mounting
frame". To evaluate the sound insulation performance of stand-alone walls precisely,
each structure should be completely isolated from the base and, in addition to
this, we have made it possible that three structures are completely isolated each
other acoustically - the first in the world.
This acoustical test facility enables to measure stand-alone walls achieving sound
insulation of up to TLD 80 precisely as the transmission of sound (especially
low frequency air vibration) from the source room to the sound receiving room
through adjoining parts of the structure can be completely prevented.
- Measurement Limit: TLD80
- Diffusion Plate: A sheet of diffusion plate is installed in both the sound
source room and the sound receiving room.
- Sound Source Room: Capacity 286m3 Surface Area 265m2
- Sound Receiving Room: Capacity 304m3 Surface Area 276m2
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Supervision of Design: Professor Hideki Tachibana
at Institute of Industrial Science Department of Human and Society of the University
of Tokyo
Background: Chairman of International Institute of Noise Control Engineering (I-INCE),
Whip of Institute of Noise Control Engineering/Japan (INCE/Japan), Former President
of Acoustical Society of Japan |
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