厅堂声学计算机模型的应用(英)

此处所介绍的厅堂声学计算机模型计算了房间和多功能厅的声学响应。这个模型是以房厅的三维表示为基础的。每个墙面都赋予一个吸声系数，并且分成更小的单元。首先计算了单元间影响系数所组成的矩阵。对于给定的声源，可以计算每个单元收到的能量，产由此定出房厅内任一点的声级，这样又能够算出（ａ）随距离变化的衰减，（ｂ）在任一平面上的声照度，和（ｃ）任一点所收到声能的接收指向性。可以算出房厅内任一被选定点的回波图，作

An application of the hall acoustics computer model

The Hall Acoustics computer model presented here carries out thecomputation of the acoustic response of rooms and large multipurposevolumes. The model is based on the 3 D representation of the volume. Thesurfaces are each assigned an absorption coefficient and are subdividedinto smaller elements. A matrix of influence coefficients betweenelements is first calculated. Given a sound source, the energy receivedby each element is calculated, and from this, the sound level at anypoint in the volume can be determined, making it possible to calculate(a)the attenuation with distance, (b)the acoustic illumination on anyplane, and (c)the reception directivity of the sound energy received atany given point. Echograms at any chosen point in the volume can becalculated, as well as the evolution with time of the reception directivity atthe receiver: such a feature enables checking the possible discrepancybetween the visual and the sound pictures. This software makes itpossible to modify the shape of the room at will, in order to optimizeits acoustic features. One example of hall acoustics studies is presented(Main Hall of Al Shura, Riyadh, Saudi Arabia).