三个函数信号叠加，进行小波分解，提取近似信号与原信号比较-Superposition of three functions signals, wavelet decomposition, similar to the signal extraction compared with the original signal

分别用Pisarenko谐波估计法、MUSIC算法和ESPRIT算法对三正弦叠加高斯白噪声信号源进行频率估计，附件中有代码说明，编译环境为matlab。-Respectively Pisarenko harmonic estimation, MUSIC algorithm and the ESPRIT algorithm superimposed on the three sine Gaussian white noise signal source for frequency estimati

小波变换，硬阈值降噪，产生原始信号，在原信号中叠加入高斯白噪声，信号重构-Wavelet transform hard threshold noise reduction, resulting in the original signal, stacked Gaussian white noise to the original signal, signal reconstruction

02 正弦信号的叠加合成；合成f 50Hz，幅值为3的方波- 02 sine signal synthesis Synthesis of f 50 hz, square wave amplitude is 3