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got rid of all of the unnecessary parens - order of operations is preserved. Renamed variables to more commonly used (and shorter to fit on one screen) terms.

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edit approved Sep 11, 2015 at 1:59

jaket

Hi all, I've been trying to zero centre a waveform prior to IFFT. my recent attempts are based on the following code which is producing the waveform below. I don't understand why this isn't working or why there are notches in the sawtooth wave. Is my math incorrect?

The following code: double dZeroStartRadianValue = (((k_dTWOPI * a_dFundamentalFrequency) / a_dSampleRate) * (a_zFFTSize * 0.50) * -1.0); // This zero centers snippet is used to center it.

zeroStartRadianValue = 2*PI*f0/fs*NFFT*0.50*-1.0;

code: double dZeroStartRadianValue = (((k_dTWOPI * a_dFundamentalFrequency) / a_dSampleRate) * (a_zFFTSize * 0.50) * -1.0); // This zero centers it.

The following code snippet is used to center it.

zeroStartRadianValue = 2*PI*f0/fs*NFFT*0.50*-1.0;

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asked Sep 10, 2015 at 22:54

cixelsyd

Phase Issue in IFFT

code: double dZeroStartRadianValue = (((k_dTWOPI * a_dFundamentalFrequency) / a_dSampleRate) * (a_zFFTSize * 0.50) * -1.0); // This zero centers it.

fft ifft