FFT处理汉宁窗

float Han_Win(u16 i ,u16 ADC)
{
float Wn;
Wn = 0.5-0.5*cos((2 * Pi*(i - 1))/(N - 1)); //w = .5*(1 - cos(2*pi*(1:m)'/(n+1))); 
Wn = Wn * (float)ADC; 
return Wn;
}

    for(i = 0; i < N ; i++)

    {
        lBUFIN1[i] = Han_Win(i ,(s16)ADCConvertedValue[i]);
        lBUFIN2[i] = Han_Win(i ,(s16)(ADCConvertedValue[i]>>16));    
    }