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Sound Insulation Test

Verification of Sound Insulation Performance
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
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
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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