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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 ？

alex zhao
Prodigy 143 points

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？

  • 0
    TI__Genius 12210 points

    你说的是input data是小数么？下面是该函数的参数定义：

    w[2*nx]        Pointer to complex Q.15 FFT coefficients.
    nx                 Length of FFT in complex samples. Must be a power of 2 or 4, and 16 ≤ nx ≤ 65536.
    x[2*nx]         Pointer to complex 16-bit data input.
    y[2*nx]         Pointer to complex 16-bit data output.