声音频谱和时域图像的matlab绘制，并且加入固定频率的噪音听取其效果。-Sound spectrum and time domain matlab image rendering, and adding noise fixed frequency to listen to its effects.

matlab实现的音频水印和图像水印代码 包括回声和量化方法 扩频水印以及最低位编码 附实验报告-Matlab audio watermarking and image watermarking code Including the echo and quantitative methods Spread spectrum watermarking and lowest coding experiment report