关于输入数组的问题,为何要把x_ref数组右移16位得到x_16x16数组作为DSP_fft16x16函数的输入,为何要把x_ref数组右移SCALE位得到x_16x32、x_32x32数组函数作为DSP_fft16x32、DSP_fft32x32函数的输入???
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主要是防止FFT计算的时候溢出,如果数据饱和的话,就出错了,先右移,最多损失点精度,且和twiddle 参数位宽也匹配