ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

3aAA2. Computer model versus reality in a nonshoebox orchestra hall. Part II.

David Griesinger

Lexicon, Inc., 100 Beaver St., Waltham, MA 02154

The Portland (Maine) City Hall Auditorium was the venue for acquisition of occupied and unoccupied acoustical data on 4 October 1994, using the MLSSA system. An ODEON (c) computer model of this hall, created by Kirkegaard and Associates, is used to estimate acoustical parameters from the same source and receiver locations as used in the live audience acquisition. The data collected in the hall are analyzed for musical intelligibility and reverberance using new and modified standard measures. Comparisons are made to the informal impressions of the listeners at the concert. The relevant usefulness of the data estimated from the computer model is discussed. The role of computer model surface definitions with respect to coefficients of absorption and diffusion is investigated. [Work supported by the Concert Hall Research Group.]