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请问,C64X中的dsplib,快速傅里叶(FFT)变换时,需要输入的是小数,该怎么处理 ?

你好!

    C64X的dsplib中,FFT的函数是 

void DSP_fft16x16 (
const short * restrict ptr_w,
int npoints,
short * restrict ptr_x,
short * restrict ptr_y
);

那么请问我需要输入的是小数该如何处理呢?