ASA 125th Meeting Ottawa 1993 May

1aAA4. Effects of measurement equipment and procedure on IACC measurements.

Gary W. Siebein

Wei-hwa Chiang

Gary S. Madaras

Harold W. Doddington

Wilhelm K. Schwab

Architecture Technol. Res. Ctr., Univ. of Florida, 231 ARCH, Gainesville, FL 32611-2004

John S. Bradley

Natl. Res. Council, Ottawa, ON K1A 0R6, Canada

A series of binaural acoustical measurements were taken at several source locations and multiple receiver locations in eight concert halls using the Acoustical Research Instrumentation for Architectural Spaces (ARIAS) system and manikin developed at the University of Florida and the BRAM software system developed at NRC Canada with a B&K dummy head and torso. This paper will compare the results of room average data and several specific seat locations obtained from the two measurement systems with an analysis of the similarities and differences that arose. Correlations among various forms of IACC including IACC[sub early], IACC[sub late], IACC[sub with direct sound], and IACC[sub without direct sound] were studied. A comparison of binaural reflectograms for locations within each room were also made. Summary graphs showing ranges of each measurement within each of the rooms and discussion of similarities and differences among the groups of rooms will be presented. [Work supported by the National Science Foundation and Concert Hall Research Group.]