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Objective Measures of Spaciousness and Envelopment
Research into concert hall acoustics has shown that acoustic preference is strongly influenced by spatial properties of the sound field. Commonly discussed perceptions include Apparent Source Width (ASW), -Intimacy,- and Listener Envelopment (LEV). Objective measures of these perceptions have proven difficult to construct, in part because the perceptions depend strongly on the source signal. Current measures for these properties have not always given consistent results and are not, in general, applicable to sound systems in small rooms. This paper discusses the strengths and weaknesses of conventional measures. It also presents two new measures, diffuse-field transfer function (DFT) and average interaural time delay (AITD), which are useful at low frequencies in small rooms.
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