将声音文件在时间轴上分割成几段，分别将段的秩序及某些段内的秩序颠倒，从而实现了对声音文件的加密。首先，先读取一个声音信号，对信号做1024点FFT变换，取完点之后，分成四个向量，四个向量组成一个矩阵，再对每一个向量进行转置，再重新整合，从而就实现了回密的过程。-Sound files on the timeline will be divided into paragraphs, each paragraph of the order and reversed the order of some

利用傅里叶变换实现两幅大小相同的RGB图像的水印嵌入。包含水印的大小处理，水印嵌入和提取，以及对PNSR的计算。-Fourier transform two of the same size of the RGB image watermark embedding. Contains the size of the watermark processing, the watermark embedding and extraction, as well as on the PNSR the ca

哈特莱变换的产生和解调，可以用于编码解码，以及接受处理时代替FFT的程序-Hartley transform of generation and demodulation, and can be used to code decoding, and accept the processing instead of the FFT program