2） c++加窗 https://blog.csdn.net/jacke121/article/details/61917610
3）https://blog.csdn.net/qq_23869697/article/details/79283875 （典型的窗口大小是25ms，帧移是10ms。汉明窗函数为W(n,α ) = (1 -α ) - α cos(2PIn/(N-1))，0≦n≦N-1 一般情况下，α取0.46 ），而网页http://read.pudn.com/downloads336/sourcecode/windows/other/1473752/C%E7%A8%8B%E5%BA%8F-%E7%AA%97%E5%87%BD%E6%95%B0%E6%B3%95%E5%AE%9E%E7%8E%B0FIR/%E7%AA%97%E5%87%BD%E6%95%B0%E6%B3%95%E5%AE%9E%E7%8E%B0FIR.txt__.htm 中 for(i=0;i<n;i++) w=0.54-0.46cos(2.0pi*(float)i/(n-1)); break;