Eduardo Mendez Castaneda
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
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.