In this paper, a mathematical model is used to characterize this random signals, and a time averaging method is used for obtaining the ultrasonic attenuation coefficient.
本文提供了一种用于识别这类随机信号的数学统计模型，并介绍了一种时间平均法用来获取超声背散射信号的衰减系数。
The test program calls each method repeatedly with a large loop count, averaging the time measurements over several calls.
测试程序重复调用每种方法，使用一个大循环数，从而平均多次调用的时间衡量结果。
In order to increase the measuring accuracy the sample averaging method must be introduced, so that a certain time of measurement is needed.
为了提高测量精确度，减少随机误差，对噪声峰值测量应采用统计平均方法，所以也需要一定的测量时间。
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