First folding structure, lightweight and portable.
首创折叠式结构，轻巧便于携带。
First, the design requirements in accordance with MATLAB to produce the filter coefficients, using CSD coefficients to optimize the code right, and then folding structure, achieved through code.
首先根据设计要求用MATLAB产生相应的滤波器系数，用CS D码对系数进行优化，然后采用折叠结构，通过代码实现。
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