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hello sir, I have doubt with FFT. ADSP-2181 supports FFT libraray. I performed 8-point FFT on a series i am not getting the exact results.plz any body suggest me. Here is the code #include<stdio.h> #include <ffts.h> #include<stdio.h> #define C 8 void main(void) { int Ireal[8]={0,1,2,3,4,5,6,7}, Iimag[8]={0,0,0,0,0,0,0,0}, Oreal[8],Oimag[8]; int k; for (k = 0; k < C; k++) { Oreal[k]=Oimag[k]=0; } fft8(Ireal, Iimag, Oreal, Oimag); printf("Real output") ; for(k=0;k<=C-1;k++) { printf("%5d",Oreal[k]); } printf("\n"); printf("imag output"); for(k=0;k<=C-1;k++) { printf("%5d",Oimag[k]); } asm("idle;"); } The results i am getting are Real output 12 -4 0 -4 12 -4 -8 -4 imag output 16 10 0 -10 -16 -2 0 2 But the actual results i should get is 28.0000, -4.0000 + 9.6569i, -4.0000 + 4.0000i, -4.0000 + 1.6569i, -4.0000, -4.0000 - 1.6569i, -4.0000 - 4.0000i, -4.0000 - 9.6569i Regards and Thanks Girish ________________________________________________________________________ Want to chat instantly with your online friends? Get the FREE Yahoo! Messenger http://mail.messenger.yahoo.co.uk |
FFT calculation.
Started by ●December 22, 2003
