signal processing - IFFT Synthesis from an empty spectrum -

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i'm trying generate sawtooth wave using ifft. can first performing fft , putting analysed spectrum ifft, able write ui enables me draw bin magnitudes , generate spectrum that. have been partially successful, waveforms don't quite look/sound right though spectrum input per formula synthesising sawtooth wave.

my question how generate spectrum array of complex values ifft when have magnitude values?

i know bin 0 , 1 0 valued. i've been trying render wave calculating magnitudes , phases significant bins containing non 0 magnitudes. able put white noise in remaining magnitude bins , calculate accompanying phases @ centre frequency? in advance contribution.

my question how generate spectrum array of complex values ifft when have magnitude values?

sorry clear answer: not @ all. values need complex, must offer user method input complex values. letting user specify magnitude offering half of freedom she/he needs specify arbitrary wave forms.


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