搜索 - 科创

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FIR大爱，尤其在音频领域非常有用，可以做出通带纹波很小、阻带衰减量极大、过渡带极陡的滤波器。采样率转换也是靠FIR。

还有一个问题刚没看清楚，“IRFP460，500V，20A，250W，”中的250W是IRFP能承受的最大损耗而不损坏的功率，而不是用它做电源能输出的功率。

DirectX不是GDI+，用printwindow当然不靠谱~~第二段代码，实际上就是键盘上的截屏按钮，当然不能按句柄了……于是……除了DirectX，确实想不出来 = =

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