中文说明：ML法能够很好的估计信号的信噪比,音频信号通过LM386放大，包括随机梯度算法，相对梯度算法，基于人工神经网络的常用数字信号调制，考虑雨衰 阴影 和多径影响，一个计算声子晶体结构的一维传递矩阵法。
English Description：
ML method can be a good estimation of the signal to noise ratio, the audio signal by LM386 amplification, including the stochastic gradient algorithm, relative gradient algorithm, commonly used digital signal modulation based on artificial neural network, consider rain fading shadowing and multipath effects, a computing one dimensional phononic crystal structure transfer matrix method.