OBJECT INFORMATION ACQUIRING APPARATUS PERFORMING ADAPTIVE SIGNAL PROCESSING

摘要

An object information acquiring apparatus including: a plurality of receiving elements (5) receiving an acoustic wave (7) propagating from an object (P) and converting the acoustic wave into an electrical signal; a delaying unit (8) aligning phases of electrical signals of M number of channels outputted from the plurality of receiving elements (5); an eliminator (9) reducing the electrical signals of M number of channels to electrical signals of L number of channels; a calculator (11) calculating Nb number of output signals corresponding to low-frequency components of a complex signal based on the electrical signals outputted from the eliminator (9); and a signal processor (12) performing beam formation according to adaptive signal processing using output signals outputted from the calculator, wherein positive integers M, L, and Nb satisfy M > L >= 2(Nb - 1).