提取淹没在噪声中的周期信号要求自相关（以判断周期）和互相关（以恢复信号自身）-Extraction drowned in the noise requirements of a periodic signal autocorrelation (to determine the cycle) and cross-correlation (to restore the signal itself)

周期信号加上白噪声，通过在matlab中，用XCORR函数，求出周期信号，干扰信号，和观测信号的自相关函数，三者互相进行比较-Periodic signal plus white noise in matlab by using XCORR function, the autocorrelation function of a periodic signal is obtained, the interference signal, and the observed signals, compa

利用labvie图形化编程方式产生周期性噪声信号-use labview to produce Periodic noise signal

BP神经网络用于函数拟合与模式识别，有循环检测，周期性检测，包括调制，解调，信噪比计算。- BP neural network function fitting and pattern recognition, There are cycle detection, periodic testing, Includes the modulation, demodulation, signal to noise ratio calculation.