The function of analog circuit was to emit and receive the ultrasonic, adjust thereceived signal; the function of digital circuit was to process the received signal anddisplay waveform.

• 系统由模拟电路和数字电路组成,模拟电路完成超声的发射接收及信号的调理,数字电路完成信号处理和波形显示等功能。