ASA 125th Meeting Ottawa 1993 May

2pAA8. An assessment of current acoustical measurements in auditoriums in relation to previously established guidelines derived from perceptual experiments in auditorium synthesis.

John J. LoVerde

Paul S. Veneklasen and Associates, 1711 Sixteenth St., Santa Monica, CA 90404

Paul S. Veneklasen and Associates has used auditorium synthesis and acoustical modeling as a guide in the design of auditoria over the past 25 years [Paul S. Veneklasen, Int. Symposium on Arch. Acoustics, 21--42 (1974)]. Optimal settings for ratios of direct to envelopmental and direct to reverberant sound level were established based on perceptual data for a variety of program materials including classical music, music drama, speech, and pipe organ by experienced listeners including conductors, musicians, music critics, concert goers, and acousticians [P. S. Veneklasen, Acoust. Soc. Am. 77th Meeting, Session P, 27--28 (1969)]. Current auditorium acoustic parameters were measured using impulse response techniques in the auditorium synthesis facility for a variety of direct, envelopmental, and reverberant sound level settings. The range of values for the various auditorium synthesis settings is shown for the measured acoustic parameters [source strength (G), early decay time (EDT), early/late energy (C), and lateral energy fraction (LF)]. Based on the guidance from auditorium synthesis, two additional parameters are introduced that should be considered for a more complete assessment of auditoria acceptability. These are the direct to envelopmental and direct to reverberant energy ratios.