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vrijdag 18 januari 2019
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  Measurement Data for Simulation Programs

Anechoic Chamber* University Oldenburg, Germany

This room of the dimensions 8.50 x 7.00 x 4.00 m3
(measured from wedge-tip to wedge-tip), equipped with foam-wedges
of about 1.5m in depth, fulfills the requirements for free-field
measurements down to a lower limiting frequency of 50Hz.

It is enclosed in a rigid cement housing, which is mounted on springs
inside a separate building.

The resonant frequency of the mass-and-spring system lies below 5Hz.

* Anechoic chambers are commonly used in acoustics to perform experiments in nominally free field conditions.

This means that all sound energy will be traveling away from the source with almost none being reflected back.
Common anechoic chamber experiments include measuring the transfer function of a loudspeaker or the
directivity of noise radiation from industrial machinery. Anechoic chambers are also generally very quiet chambers,
with typical noise levels in the 10-20 dBA range.

According to Guinnness World Records, 2005, Orfield Laboratories NIST certifield anechoic chamber
is "The quietest place on earth" measured at (minus) -9.4 dBA.

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will be extended...