Pd_Figure

周期图法进行功率谱估计的函数，配套张旭东的课本习题(Periodogram power spectrum estimate of function, supporting the Textbook Exercise Zhang)

（实验）快速傅里叶变换及其应用。包含fft实验的所有源程序，实现fft的基本功能。((Experimental) Fast Fourier Transform and Its Applications. Contains all the source code of the fft experiment, to achieve the basic functions of the fft.)

三维模式时域有限元求解电磁场，计算电磁学初学者，编写的程序代码，希望可以帮助广大网友(Three-dimensional time-domain finite element method solves electromagnetic field, calculates electromagnetic beginners, compiles the program code, hoping to help the vast number of netizens.)

该函数用来计算时间序列的盒维数 具体内容说明在程序中标出(The function used to calculate the time series dimension of the boxes indicate the specific content of the successful bidder in the process of)

多元线性回归是概率论研究的热点，此程序针对多元线性回归而设计的Matlab程序(Multiple linear regression is the probability of research in this field, this program is designed for multiple linear regression of the Matlab program)

坐标系变换，有球心坐标系转换为地理坐标系(the conversion between the coordinates)

先将47168bit的宿主音频等步长分段,分为1000段，然后混沌序列选择其中的102段，对每段进行3及小波分解，挑选出绝对值最大的系数，运用嵌入公式。(47168bit first step of the host audio sub-divided into section 1000, and then select one of the 102 chaotic sequence segment, on each piece of a 3 and wavelet decomposition, the largest absolute value coefficients selected using the embedded formula.)

在查找表中进行比较输出的硬件实现程序部分程序。(Search at the table to compare the output of the hardware implementation procedures for some of the procedures.)

In telecommunications, direct-sequence spread spectrum (DSSS) is a modulation technique. As with other spread spectrum technologies, the transmitted signal takes up more bandwidth than the information signal that modulates the carrier or broadcast frequency. The name spread spectrum comes from the fact that the carrier signals occur over the full bandwidth (spectrum) of a device s transmitting frequency.

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