Abstract
An acoustician can identify and treat problematic surfaces to reduce or eliminate unwanted reflections only if he knows the origins of those reflections. Several measurement techniques exist for the purpose of identifying these origins, including the Polar ETC method, which requires six cardioid impulse response measurements along Cartesian axes. This presentation will explore two implementations of the method using either a microphone positioner and six sequential cardioid measurements (as originally intended) or four simultaneous measurements from a tetrahedral subcardioid microphone array (originally intended for Ambisonic recordings, but also usable to synthesize the six cardioid measurements). It will compare the two approaches and investigate typical errors introduced by nonideal cardioid directivity patterns. The presentation will also discuss the capabilities of a new method, based on a Cartesian array of seven omnidirectional microphones, and explore the effects of nonideal omnidirectional patterns.
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