Identification of acoustic path transfer function component in beamforming structure

Abstract

This paper presents identification technique of minimum phase component from acoustic transfer function between two inputs and sound source, where two acoustic path transfer functions are analyzed as unknown system in beamforming structure. Analysis shows that total component value from two acoustic path transfer functions can be obtained by adding two estimate values by adaptive FIR filter on separate applications of minimum phase filter and inverse minimum phase filter in beamforming structure. Based on this, it will be shown that a separate application of minimum phase filter and inverse minimum phase filter can provide a solution to identify minimum phase term of unknown system.