Acoustical System Identification

This paper concerns the measurement of an acoustical impulse response of a room. To achieve this goal, a hardware platform was developed to determine the complex frequency spectrum between a sound source and a receiver. A loudspeaker serves as a sound source to expose the room to acoustical pressure waves. The loudspeaker passes stepwise through the audible spectrum. Four microphones measure the signals at different positions in the room. As soon as a steady state condition is reached, the phase and amplitude of the signal are computed. Subsequently to the spectral measurements, the impulse response can be calculated. The impulse response can be used to simulate the acoustical behavior of a room. For example, a song can be computed to sound exactly if it was played in a room where a measurement has been done.

Studienbetreuer: Thomas Graf