Development of a loud speaker type reference sound source

摘要

Recent years have seen the adoption of sound power level as a means of measuring machinery and equipment noise, in addition to the conventional sound pressure level. For measurement of sound power levels in disciplines dealing with sound fields, the comparison method based on reference sound sources is generally employed for the simplicity of measurement it provides. Furthermore, the application of reference sound sources will also be viable for measuring equivalent sound absorption area in the design of sound insulation and for measuring sound propagation characteristics. The authors are routinely involved in developing reference sound sources and have recently fabricated a prototype loudspeaker-type reference sound source and evaluated improvements over conventional loudspeaker-type sound sources.