Abstract
The early lateral energy fraction (LF) is one of the most important descriptors of concert hall sound. This technical note investigates the performance and practicality of measuring LF with a 3-D microphone array system and compares this to two traditional dual microphone systems. A series of simulated sound fields consisting of the direct sound and a single reflection in an anechoic chamber were used to assess the performance of the three systems. The reflection was varied in angle and level, and the measured LF values were compared to the known or calculated values. The 3-D system was found to be the most accurate, with measured LF values within 0.4 just-noticeable-differences (JND) of the calculated values. The two dual microphone systems were mostly within one JND of the calculated values.
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