一.引言几何声学是以声音在均匀介质中的直线传播的性质为根据的,当声波在两种介质的交界面上传播时,发生了反射和折射,这种情况完全类似于几何光学,服从于反射定律和折射定律。声音的这种直线传播的属性是以声线来作表示的。在房间中,由于受到围护房间各表面的影响,声线发生了反复许多次的反射,而这些反 I. INTRODUCTION Geometrical acoustics is based on the nature of sound propagation in a straight line in a homogeneous medium. Reflections and refractions occur when sound waves travel at the interface between two media. This is exactly analogous to geometrical optics. In the law of reflection and the law of refraction. This straight-line property of sound is represented by sound rays. In the room, due to the influence of the surfaces of the enclosing room, the sound line undergoes many repeated reflections.