CAD programs rely on the use of mathematical algorithms for the computational simulation of acoustical room data. Existing computing time limitations have favored ray-tracing for the simulation of realistic impulse responses (wall numbers >= 40, length of the impulse response > 500 ms) by means of powerful workstations. Sound imaging is preferred by commercially-oriented CAD-programs, since because of the low mirror image order used (mostly <=5), very fast and also correct results can be achieved. Unfortunately, answers are valid only for short impulse responses and low wall numbers. This paper discusses the use of sound imaging calculations with sophisticated pre-selection criteria algorithms that provide accurate results in acceptable times for longer impulse responses on normal PC-AT computers. A typical simulation, arrived at with the new EASE CAD-program demonstrates the power of this improved sound imaging technique.
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