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Research Facilities

Nihon Onkyo Engineering has various research and experimenting facilities in its quest to promote research and development. These facilities are used for developing our own products, and for testing in support of development work with customers.

Anechoic rooms

Nihon Onkyo Engineering's highly flexible anechoic room can be transformed from a full-anechoic room to a semi-anechoic room by removing the sound absorbing wedges on the floor. In the full anechoic room configuration, the acoustic characteristics of the equipment such as speakers can be measured accurately. Semi-anechoic rooms can be used for a variety of measurement applications, including vehicle sound insulation performance evaluations (acoustic sensitivity and contribution analysis) by setting a vehicle into the room. Accurate and fully automated measurement is available to use the microphone traverse system on the ceiling.

Full anechoic room

Full anechoic room

Semi-anechoic room

Semi-anechoic room

Application

Full anechoic room
Semi-anechoic room

Specifications

Effective dimension, fully anechoic room: 6.2 m × 4.8 m × 2.9 m (D × W × H)
Effective dimension, Semi-anechoic room: 6.2 m × 4.8 m × 3.5 m (D × W × H)
Cutoff frequency: 160 Hz
Measurement frequency range: 160 Hz to 20 kHz
Various acoustic characteristics (sound source radiation characteristics, directivity, transfer functions, etc.)

Reverberation rooms

Nihon Onkyo Engineering has a large and a small reverberation room for use according to the measurement target and application. The large reverberation room can be used for sound absorption coefficient for large samples such as building materials. For example, setting a vehicle in the room enables evaluating sound insulation performance of the vehicle body. The small reverberation room is used for measuring the sound absorption coefficient of small samples mainly such as the materials used in vehicle interior.

Large reverberation room

Large reverberation room

Small reverberation room

Small reverberation room

Application

Specifications

Large reverberation room
  • Volume: 140 m3
  • Effective dimension: 7.4 m × 4.7 m × 4.0 m (D × W × H)
  • Sample size for sound absorption coefficient : 8 m2
  • Frequency range for sound absorption coefficient: 200 Hz to 5 kHz
Small reverberation room
  • Volume: 9 m3 (irregular octahedron)
  • Sample size for sound absorption coefficient: 1 m2
  • Frequency range for sound absorption coefficient: 500 Hz to 5 kHz

Sound transmission loss suite

By inserting a sample in the window between the reverberation and anechoic room, the reverberation room works as the source room and the anechoic room works as the sound receiving room, the sound intensity transmitted through the sample can be measured in order to measure the sound transmission loss. Various measurement applications can be utilized between a large reverberation room and an anechoic room, from sound transmission loss measurement for building materials, fittings. Also it can be used for evaluating sound insulation performance of the vehicle components, like floor and ceiling modules.

Sound transmission loss suites

Sound transmission loss suites

Sound transmission loss suites

Sound transmission loss suites

Application

Specifications

Large reverberation room
  • Sample size for sound transmission loss measurement: Max. 2.7 m × 2.3 m (W × H)
  • Frequency range for sound transmission loss measurement: 200 Hz to 5 kHz
Small reverberation room
  • Sample size for sound transmission loss measurement: Max. 1.0 m × 1.0 m (W × H)
  • Frequency range for sound transmission loss measurement: 400 Hz to 5 kHz

Listening laboratory

Nihon Onkyo Engineering's listening room is mainly used for comparative listening through auralizing various simulation results, psychoacoustic tests.

Listening laboratory

Listening laboratory

Screen use in the listening laboratory

Screen use in the listening laboratory

Impedance tube measurement system

Nihon Onkyo Engineering's impedance tube measurement system (ISO 10534-2-compliant) uses a 40 mm diameter acoustic tube and a 300 mm × 300 mm square tube. Both are used for measurement using the transfer function method. The system can be used to measure acoustic characteristics such as general measurements including normal incident sound absorption coefficient and normal acoustic impedance as well as characteristic impedance, propagation constant, and to calculate normal incident sound transmission loss.

Impedance tube measurement system

Impedance tube measurement system

Specifications

Measurement frequency range
200 Hz to 5 kHz (during measurement of a 40 mm diameter sample)
63 Hz to 500 Hz (during measurement of a 300 mm × 300 mm sample)

Measurements

Material parameter testing device for Biot model prediction

Nihon Onkyo Engineering has test system for determining various material parameters required for poroelastic model prediction for estimating sound absorption and sound insulation performance of various interior materials, mainly for use in automobile industries. The equipment is used for both our research and development as well as testing for customers. Nihon Onkyo Engineering uses this equipment to measure various parameters in order to predict sound absorption and sound insulation performance. These predictions are then compared with measurements using impedance tubes and reverberation/anechoic rooms in order to verify the accuracy.

Acoustic material parameter measurement systems

Acoustic material parameter measurement systems