PROBLEM TO BE SOLVED: To provide units for making a calculation circuit for calculating a CMP method at high speed into a small circuit at a low cost.SOLUTION: An object information acquiring apparatus includes: a plurality of receiving elements which receive acoustic waves emitted from an object and convert the acoustic waves into received signals a phase delay unit which matches phases of the received signals a complex converter which converts the received signals output from the phase delay unit into complex signals a complex correlation matrix calculator which periodically obtains a complex correlation matrix by using a complex signal group configured from a plurality of phase-matched complex signals an eliminator which eliminates the number of bits of input data configured from at least either the complex signal group or matrix elements included in the complex correlation matrix and an electric power calculator which calculates a power of target positions based on the complex correlation matrix, wherein the eliminator eliminates the number of bits by performing common level conversion processing on all input data relating to one complex correlation matrix.COPYRIGHT: (C)2013,JPO&INPIT【課題】CMP法を高速で計算する計算回路を安価で小型の回路とするための手段を提供する。【解決手段】被検体から放出された音響波を受信して受信信号に変換する複数の受信素子と、受信信号の位相を揃える整相遅延手段と、整相遅延手段から出力された受信信号を複素信号に変換する複素変換手段と、位相の揃った複数の複素信号からなる複素信号群を用いて一定周期ごとに複素相関行列を求める複素相関行列計算手段と、複素信号群および複素相関行列に含まれる行列要素の少なくともいずれか一方からなる入力データのビット数を削減する削減手段と、複素相関行列に基づいて注目位置毎の電力値を計算する電力計算手段を有し、削減手段は一つの複素相関行列に関する全ての入力データに対して共通のレベル変換処理を行いビット数を削減する被検体情報取得装置を用いる。【選択図】図1
