Using the time-gain compensation and peak time detecting technique, the arrival time of ultrasonic echo can be correctly detected.

采用了时间增益补偿技术和峰值时间检测技术，可正确检测超声波回波的到达时间。

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The peak time detecting circuit which is composed of full-wave rectification circuit and differential circuit can detect the reach time of echo signal accurately.

采用时间增益补偿技术，补偿超声波在空气中的衰减，减少回波信号的起伏；由有源全波整流电路和微分电路等组成峰值时间检测电路，可正确检测回波的峰值到达时间。

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