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better, reduced mutliply in real fft

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Mark Borgerding
2003-12-10 05:48:42 +00:00
parent b880c599ef
commit 8a992d0e98
3 changed files with 31 additions and 27 deletions
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7
fft.py
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@ -77,10 +77,11 @@ def real_fft( f,inv ):
F1k = Fp[k] + Fp[N-k].conjugate()
F2k = Fp[k] - Fp[N-k].conjugate()
F[k] = ( F1k + tw * F2k ) * .5
F2k *= tw
F[k] = ( F1k + F2k ) * .5
F[N-k] = ( F1k - F2k ).conjugate() * .5
#F[N-k] = ( F1kp + e ** ( -j*pi*(.5+float(N-k)/N ) ) * F2kp ) * .5
F[N-k] = ( F1k.conjugate() - tw.conjugate() * F2k.conjugate() ) * .5
#F[N-k] = ( F1k.conjugate() - tw.conjugate() * F2k.conjugate() ) * .5
F[N] = complex( Fp[0].real - Fp[0].imag , 0 )
return F