一部分波从所遇到的物体反射回来，形成一种信号，称为回波信号。
A portion of the waves is there reflected from the object encountered and forms what is referred to as the echo signal.
在超声反射回波的数学模型基础上，利用小波滤波方法对超声信号进行预处理，提取强噪声背景中的弱回波信号。
This paper attempts to preprocess ultrasonic signal by wavelet filtering based on the mathematical model of the ultrasonic echo, extracts weak echoes from signal with high noise background.
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