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The study of speech requires the availability of a recording environment with very low ambient noise and reflected sound. An anechoic chamber is a room in which the walls, ceiling and floor are lined with a sound absorbent material to minimise reflections. The research anechoic chamber is lined with glass-fibre wedges whose shape enables free-field conditions to exist above 90Hz. In addition the chamber is constructed as a room within a room. The outer walls are 330mm thick and the inner room is formed of metallic acoustic panels mounted on a floating floor. This results in a very low noise environment in which the sound pressure due to outside levels is below the threshold of hearing. The chamber is equipped with a Bruel & Kjaer 2231 Sound Level Meter and Laryngograph. Signals are routed to an adjacent control room containing a Sony DAT recorder and a PC. A prompting system is available for presentation of the recording material on a ceiling mounted monitor.
Here is an , about 香港六合彩's Anechoic Chamber.听
Further details about the properties of this chamber can be found in the below document:
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