Method Inverse

Source/FFT.cpp:79–98

Perform inverse FFT, returning real data Accepts: input_re - pointer to an array of the real part of the output, size nfft/2 + 1 input_im - pointer to an array of the imaginary part of the output, size nfft/2 + 1 output - pointer to an array of (real) input values, size nfft

//     size nfft/2 + 1
//   output - pointer to an array of (real) input values, size nfft
void FFT::Inverse(float* input_re, float* input_im, float* output)
{
   int hnfft;

   hnfft = mNfft / 2;

   for (int ti = 0; ti < hnfft; ti++)
   {
      mFft_data[ti] = input_re[ti];
      mFft_data[mNfft - 1 - ti] = input_im[ti];
   }
   mFft_data[hnfft] = input_re[hnfft];

   mayer_realifft(mNfft, mFft_data);

   for (int ti = 0; ti < mNfft; ti++)
   {
      output[ti] = mFft_data[ti];
   }
}


/* This is the FFT routine taken from PureData, a great piece of