### ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

## 2pAA7. Computer-based system for reverberation room design.

**Eduardo Mendez Castaneda
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*Ingenieria Acustica Spectrum, S.A. de C.V., Apaseo el Alto 21-2, San
Bartolo Atepehuacan, Del Gustavo A. Madero, Mexico D.F., CP 07730, Mexico
*

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A simple computer system named SIDIART developed in QBASIC language is
proposed, which permits the manipulation of a database of materials and their
respective absorption coefficients, making their election easy. Knowing the
volume and the areas, if the user wishes, the system suggests the optimal
500-Hz reverberation time (RT) from one of ten optional types of rooms. The
Sabine or Eyring equations, and relative humidity between 10% to 90% for the
calculus of air absorption, can be chosen. Given a number of surfaces, its
areas and a group of candidate materials for each surface, the system reports
the ratio between the optimal and calculated RT for each possibility and for
each frequency. The system has the option of searching and reporting only the
combination that offers deviations from the optimal RT defined by the user as
acceptable, if that combination exists. The algorithm of search is based on the
traditional way to solve the problem without a computer. The advantage of the
system takes root in the velocity of calculus provided by the computer;
however, the final result of the project depends upon the designer.