The use of microphone line array for acoustical surveillance system theory

Abstract

The possibility of using microphone line array for acoustical surveillance system has been conveyed through theoretical study. The range of application of the existing methods based on correlation matrix without spatial smoothing technique to identify complex noise sources such as monopole, dipole, tripole, or their combinations has been investigated. The paper also introduces simplified dipole and tripole source models to model more practical noise source. Their characteristics in practical situation have been studied in terms of the dipole angles and the dipole moments in the dipole model, and the strength ratio between the monopole and dipole in the tripole model.