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ANSI/ASA S12.79-2021/ISO 26101-21
Acoustics - Test methods for the qualification of free-field environments
This document describes the divergence loss method of measurement of performance of an environment designed to provide a free sound field or free sound field over a reflecting plane. An acoustical environment is a free sound field if it has bounding surfaces that absorb all sound energies incident upon them. This is normally achieved using specialized test environments, such as anechoic or hemi-anechoic chambers. In practice, these provide a controlled free sound field for acoustical measurements in a confined space within the facility.
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Acoustical Society of America [asa]
Acoustical Society of America [asa]