时差法超声检测是通过对发射波与第一次回波之间的时差进行计时进而求得探测目标位置的一种方法。本文以CPLD（Complex Programmable Logic Device）为基础,结合MCU（Micro Control Unit）的处理特点,介绍了发射驱动信号与接收回波检测的数字化处理方法与程序设计,简化了电路设计,加大了控制的灵活性。%With counting the time interval from transmitting pulse to the first echo, ultrasonic detect system can detect the object. This paper introduces how to produce digital signal to drive the transmitter and convert received analog echo signal to digital sign
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