PROBLEM TO BE SOLVED: To provide a signal processor, an ultrasonic diagnostic device and a signal processing method which can reduce the calculation error of distortion with easy processing.SOLUTION: A signal processor for calculating distortion of a subject relevant to change in the pressurized state by using a first signal waveform of an ultrasonic wave reflected by the subject in the first pressurized state and a second signal waveform of the ultrasonic wave reflected by the subject in the second pressurized state, comprises: phase difference extraction means which extracts a phase difference component in each time between the first signal waveform and the second signal waveform correlation calculation means which calculates the distortion difference and initial phase difference relevant to the difference in angular frequencies between the first signal waveform and the second signal waveform in accordance with the correlation between each time and the phase difference component in each time and distortion calculation means which calculates the distortion on the basis of the distortion difference.COPYRIGHT: (C)2016,JPO&INPIT【課題】容易な処理で歪みの算出誤差を低減することが可能な信号処理装置、超音波診断装置及び信号処理方法を提供する。【解決手段】第1加圧状態の被検体により反射された超音波の第1信号波形と、第2加圧状態の被検体により反射された超音波の第2信号波形と、を用いて加圧状態の変化に係る被検体の歪みを算出する信号処理装置であって、第1信号波形と第2信号波形との間での各時間における位相差成分を抽出する位相差抽出手段と、各時間と、これら各時間における位相差成分との相関関係に応じて、第1信号波形と第2信号波形との間の角周波数の差分に係る歪み差及び初期位相差を算出する相関算出手段と、歪み差に基づいて歪みを算出する歪み算出手段と、を備える。【選択図】図6
