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请教关于FFT例程FFT_Example_66_LE_COFF的问题

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_16x32x_32x32数组函数作为DSP_fft16x32DSP_fft32x32函数的输入???