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Jos Hirst, Lecturer in Audio Engineering at The University of Salford kindly invited us to experience one of the quietest places on earth. The Anechoic Chamber, meaning 'without echo'.
Vital statistics?
Background noise level -12.4dBA
Working area 5.4 x 4.1 x 3.3m
Cut-off frequency 100Hz
What is it for?
This is a room which is acoustically like being high above the ground in the open air because there are no reflections from the walls, floor or ceiling. This means it is ideal for testing the response of loudspeakers or microphones because the room doesn’t affect the measurements. It is also the best place for virtual acoustics - generating auralisations of concert halls, city streets and other spaces. The anechoic chamber is immensely quiet which makes it ideal for testing very quiet products or people hearing very quiet sounds.
How is it made?
We need to prevent sound getting into the room, and this can pass through the walls, or through the foundations of the building. The background noise level in the chamber is immensely low; this is probably the quietest place you’ll ever experience. e anechoic chamber is actually a room, within a room, within the Newton building. The walls, floor and ceiling of the inner chamber are made of heavy Accrington brick and concrete to prevent sound getting into the room. Two heavy acoustic doors with rubber seals are used to minimise airborne sound.
Find out more: http://www.acoustics.salford.ac.uk/facilities/?content=anechoic
The experimental set-up in the chamber is by Logan Schwan and is part of the COST Action DENORMS - CA15125, supported by COST (European Cooperation in Science and Technology).
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