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8192点时正弦信号变成这样
FFT也失败，如下图
点数为2048和4096点时运行正常，下附源代码
请跟踪一下输入波形生成的程序，看是运行到哪里出错了？
不是程序的问题，做1024和4096点FFT和IFFT时都好使，会不会是计算精度，内存方面的问题呢
