对获得的超声内窥图像信号进行fir滤波. 滤波器是fdatool设计的50阶高通。-a fir filter for ultrasonic signal.

这是用三角窗设计的FIR低通滤波器,来消除音乐信号的噪声,(This is using triangular window design of FIR low-pass filter, to eliminate the noise of the music signal,)