PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic apparatus that performs a phasing addition process being more accurate than a conventional one by performing an accurate phase process.SOLUTION: The ultrasonic diagnostic apparatus includes: a memory 7 a delay control part 12 a data register 13 an APF part 14 and a data register 15. The delay control part 12 calculates an all-pass filter coefficient based on a value below the decimal point of theoretical delay amount and performs a reading start address calculation and a focus position address calculation from the memory 7 based on an integer value of the theoretical delay amount. The control part stores data in the reading start address on the memory 7 in the data register 13, performs an all-pass filter process of the data in the data register 13, in which a delay process below the decimal point is executed by the APF part, stores the data in the data register 15 and outputs delay data from the focus position address of the data register 15.COPYRIGHT: (C)2013,JPO&INPIT【課題】超音波診断装置において高精度な位相処理を行うことにより、従来より高精度な整相加算処理を行うこと。【解決手段】メモリ7と、遅延制御部12と、データレジスタ13とAPF部14とデータレジスタ15とを備え、遅延制御部12で理論遅延量の小数以下の値からオールパスフィルタ係数を算出と理論遅延量の整数値からメモリ7からの読出開始アドレス算出とフォーカス位置アドレス算出を行い、メモリ7上の前記読出開始アドレスにあるデータをデータレジスタ13に格納し、データレジスタ13のデータをAPF部で小数以下の遅延処理を行うオールパスフィルタ処理を行い、データレジスタ15に格納し、データレジスタ15のフォーカス位置アドレスから遅延データを出力する。【選択図】図1
