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如何调用DSP_fft16x16r

在DSP文档里面,DSP_fft16x16r的原形是下面的,

void DSP_fft16x16r(int nx, short *x, short *w, unsigned
char *brev, short *y, int offset, int n_max),

而在后面又说下面的方式调用 ,

void DSP_fft16x16r(int nx, short * restrict x, short * restrict w, short * restrict y,
int radix, int offset, int nmax),

这2种形式不一样,该用哪个去调用,另外,如果用上面的那个调用,brev用什么函数产生??谢谢,