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FFT 範例CE018相關問題
#1
中級會員
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各位好 因不熟練C語言
想請問CE018範例中,inputsignal_square1khz.c的輸入訊號sigCmpx
看起來是將ADC值依序放在sigCmpx[0].real , sigCmpx[0].imag ,sigCmpx[1].real , sigCmpx[1].imag
(所以256點只會放到sigCmpx[128])
然後經過下面主程式 把第一筆ADC值放在sigCmpx[0].real
再放0x0000到sigCmpx[0].imag ,
依序放入sigCmpx變數 再去做FFT 這樣理解對嗎

然後經過SquareMagnitudeCplx輸出的sigCmpx變數是否已經沒有
real和imag的分別,每一個點都是代表頻率的大小,這樣的理解對嗎
THX

//////////////////////////////////主程式程式碼/////////////////////////////////////////
p_real = &sigCmpx[(FFT_BLOCK_LENGTH/2)-1].real ;
p_cmpx = &sigCmpx[FFT_BLOCK_LENGTH-1] ;

for ( i = FFT_BLOCK_LENGTH; i > 0; i-- )
{
(*p_cmpx).real = (*p_real--);
(*p_cmpx--).imag = 0x0000;
}
///////////////////////////////////////////////////////////////////////////////////////////////////

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