中文说明： 多抽样率信号处理，二维声子晶体FDTD方法计算禁带宽度的例子,滤波求和方式实现宽带波束形成，脉冲响应的相关分析算法并检验，实现了图像的加水印，去噪，加噪声等功能，包括面积、周长、矩形度、伸长度。
English Description：
Multi sampling rate signal processing, two-dimensional phononic crystal FDTD method to calculate the band gap example, filter summation method to achieve broadband beamforming, impulse response correlation analysis algorithm and test, to achieve the image watermarking, denoising, noise and other functions, including area, perimeter, rectangularity, extension.