Researches at this laboratory involve creating optimum environments in response to the increasingly diversified needs of society. Engineers are focusing on the development of techniques that improve the acoustics in concert halls and sound insulation in apartment buildings, and on the control of electromagnetic waves.

Acoustic Experimental Room

Sound simulations with scale models are made to create optimum acoustic conditions in theaters, concert halls, etc., and to assess noise levels on streets, in factories, etc. Acoustic-related psychological tests are also performed at this facility.
Measurement---8(L)x13(W)x5(H)m=520m³
Hemi-anechoic Room---Wall, Ceiling; absorbable, Floor; reflective
Background noise---20db(A) below 20db(A)

Reverberation Room

This room is separated into two chambers. Both consist of seven irregular plane surfaces, which are designed to create a diffused sound field. By setting an architectural material between the two chambers, sound transmission and absorption loss can be measured.
Reverberation Room 1---370m³ (Floor area 83m²)
Reverberation Room 2---212m³ (Floor area 46m²)
Opening in the partition between above two rooms---4(L)x2.5(W)=10m²
These rooms are surrounded with 7 irregular plane surfaces

Reverberation Room 1	Reverberation Room

Acoustic and Electromagnetic Wave Anechoic Room

This room serves as an anechoic chamber for acoustics and electromagnetic waves, and research on noise reduction and interruption of communication apparatuses by electromagnetic interference.
Shielding surface Measurement---8.1(L)x9.6(W)x6.1(H)m
Shielding Ability---over 80dB at 150KHz-1GHz, FCC standard (at application)
Anechoic Room---Wall, Ceiling; sound absorbing wedge, Floor; sound absorbing mat

Measurement Room for Electromagnetic Waves

This room is used for experiments on electrical immunity for machine, shielding testing, and preliminary measurement of electromagnetic interference.
Shielding surface Measurement---4.2(L)x6.2(W)x3.6(H)m
Shielding Ability---over 70dB at 150KHz-1GHz

Hazama Technical Research Institute
515-1, KARIMA, TSUKUBA-SHI IBARAKI, JAPAN
TEL: 029-858-8803 / FAX: 029-858-8809