One of the most common digital-signal-processing techniques is the discrete Fourier transform (DFT), which breaks a signal into its component frequencies and can be represented as a matrix.

最常见的数字信号处理技术之一是离散傅立叶变换（DFT），它把一个信号分解成它的组成频率，并表示成一个矩阵。

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We suggest the server side to do the cartographic transformation for the grid points, and then get a linear transform matrix each grid for the other points.

服务器负责计算网格点的投影换算，建立线性转换矩阵，把矩阵传递到客户端，客户端依据矩阵做实时的投影转换。

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A new blind separation algorithm based on signals' whiten transform and QR decomposition of matrix is proposed.

基于信号的白化变换及矩阵的QR分解理论，提出了一种新的盲分离算法。

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