National Ignition Facility

Laser Interferometer Gravitational Wave Observatory

Noise Associated with Geothermal Development, Department of Energy

Acoustical Ray Tracing, National Science Foundation

    Ray Plane Intersection
Architectural Acoustics, 2006
  Acoustical Ray Tracing and 3D Sound Reproduction   mnv

The computer modeling of acoustic spaces is becoming a highly developed art. In 1992, MLA was awarded a Phase I SBIR grant by the National Science Foundation to develop an acoustic modeler using ray tracing. Ray tracing is a mathematical technique wherein sound is modeled as an arrow or ray that is emitted by the sound source and flies around a room reflecting off the internal surfaces. The sound source has a given sound power level and emits a hedgehog of rays that include frequency and directivity information. When a ray intercepts a surface it is reflected or scattered. Its level can be reduced if the surface is absorptive.

Accordingly, we began a program of computer coding based on our in-house loudspeaker modeling software to generate rays within an acoustic space and follow them around a room as they interact with the interior surfaces. At the same time we began experiments with three dimensional sound reproduction.