Index of content:
Volume 109, Issue 3, March 2001
- ARCHITECTURAL ACOUSTICS 
Relation of acoustical parameters with and without audiences in concert halls and a simple method for simulating the occupied state109(2001); http://dx.doi.org/10.1121/1.1340649View Description Hide Description
Five acoustical parameters—reverberation time RT, early decay time EDT, clarity strength and interaural cross-correlation coefficient IACC—were measured using identical procedures with and without audiences in six concert and opera halls. Reverberation times without audiences were measured in 15 additional halls using the same measuring techniques as for the six halls above, but for full occupancy the data were taken from musical stop chords at symphonic concerts. This paper shows that in all halls (1) the occupied RT can be predicted from the unoccupied RT using a linear regressionequation, within acceptable limits, at low- and mid-frequencies. It is also shown for the six halls that (2) occupied are predicted accurately from unoccupied values by the newly proposed equation; (3) with and without audiences are highly correlated by a first degree linear regressionequation; and (4) IACCs have nearly the same value in both occupied and unoccupied halls. As a separate subject, the successful use of a cloth covering for seats in a concert or opera hall to simulate the occupied condition has been developed.