Hi Forum,
I am trying to implement a formula from a paper:
Y(w) = e^(i*phase) * (H(w) + H’(w))
Where H is the fourier transform of a window function h (a blackman window
in my case), H’ is the derivative of H (in the paper, H and H' are called
spectrum motifs). A signal will then be generated from ifft(Y).
In the paper it says:
In practice, the signals to be synthesized are real, and the inverse FFT
algorithm only uses the positive frequency half spectrum, *so only one of
the two spectral motifs must be synthesized*.
I don’t understand what it means by “only one of the two spectral motifs
must be synthesized”. How do I decide which spectral motive to use?
ps. I simplified the formula for simplicity. But in case you want to see
the complete formula:
Y(wk) = e^(i*phase) * (0.5 * A * H(wk - wf) + 0.5* B *H’(wk - wf))
for |wk - wf| <= K * 2pi / N
ps2. sorry I just by accident posted the same question without a subject an
hour ago, is there a way to delete it from the archive?
Thanks in advance!!!
MF
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