Concert & Opera Halls: How They Sound

A Factor Analysis Approach to Determining a Small Number of Parameters for Characterising Halls

“…of 0.62. However, it should also be pointed out that this has been determined in all measured points (which as shown is a high number) and not a single point in accordance with the Beranek procedure [10]. The fact that ITDG and reverberation times are correlated, might be simply because they would both tend to increase with increasing room volume.…”

“…This is interesting since ITDG is considered to be statistically independent by most of the scientific community [29], [10]. Accordingly, it should be noted that correlation with RT mid is low, i.e.…”

“…Parameters. As in the case of the previous study, all the parameters analyzed, grouped according to their fundamental subjective sensations [27], [28], [10], [29], [30] were as follows:…”

“…Beranek, in his classic book [10], and more recent works [11], [12], [13], nominated six parameters: early decay time; strength factor; bass ratio; the time between the first direct sound and first reflection; the interaural cross-correlation coefficient; and the surface diffusivity index. This parameter is less used because of the difficulty involved in objective determination (visual inspection), while the parameter of spatial impression (the early lateral energy fraction) is currently used.…”

“…And, finally, ITDG is defined as the length of time in ms, between the arrival of the direct sound and the arrival of the first reflection [10], calculated at each measured point (without following the author's definition).…”