Comparison of two test methods for determination of broadband sound power levels emitted by products: a reverberation chamber method versus a hemi-anechoic chamber method

摘要

The use of sound power levels in specification, labeling, and design of noise-emitting products has a distinct advantage over the use of sound pressure levels in that sound power levels can be considered a property of the device and not of the test environment or distance away from the device. Ideally, end-users of the product should be able to compare sound power levels as a product-selection consideration or develop maximum allowable sound power level specifications for given applications, independent of the test method used to determine sound power levels or particular laboratory performing the testing. With that goal in mind, two commonly used methods for determining sound power levels - a reverberation chamber method and a hemi-anechoic chamber method - are compared, with respect to correlation of determined results as well as practical considerations (test time, measurement instrumentation required, and chamber configuration).