An acoustic holography method with random sparse microphone array to locate moving sound sources

Abstract

To locate the moving sound sources with microphone arrays, with the random sparse arrays we could get equal results but much less microphones than the complete arrays; then the measuring system could be inexpensive and less complicated. The traditional technique to identify sound source with random sparse array is usually based on the beamforming principle, its resolution at low frequencies is not very good. An acoustic holography method with random sparse microphone array is proposed; an incomplete holography plane is constructed with the sound pressure data collected by the sparse array, then the sound pressure distribution of the radiating plane is computed with the acoustic holography method based on the principle of phase-conjugate waves focusing. The simulation indicates that the results of random sparse array have lower side lobes and better identifying performance than those of regular array with equal microphones. The experiment result shows that the sound sources in a moving car can be located correctly with this method.