The perceptual relevance of extant techniques for the objective measurement of spatial impression

Research into the subjective attributes that contribute to the perceived spatial impression of concert hall acoustics and the objective measurements that may relate to these has been in progress for a large number of years. From this, it has been broadly agreed that spatial impression consists of apparent source width (ASW) and listener envelopment (LEV). However, despite the research that has been conducted into objective measurements that relate to these attributes, a consensus has not yet been reached about the most suitable measurement technique to employ. This is indicated by the fact that they are included as an appendix and are not contained in the main body of the current International Organization for Standardization (ISO) document. In addition, the reader is given a number of options to choose from, with no indication of the relative merits of each.

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