On Sun, Feb 28, 2010 at 08:35:37PM -0500, Gene Heskett wrote: > On Sunday 28 February 2010, Gordon JC Pearce wrote: > > So did mine Gordon, heck, while I know what it is, and that its symetrical, I > could write an FFT or even a butterfly transform with a gun to my head. But > I have sure made heavy use of gear that can do it over the years.
The discrete form is a set of two FIRs I[i] and Q[i] with Q[i] = 0 for even i Q[i] = 2 / (pi * i) for odd i for i = -N...N, delayed by N samples to make it causal, and I[i] is just a delay of N samples. Q is an finite-lenght approximation of the real thing, so its FR is not entirely flat. If it matters you can modify I for the same FR to compensate. Ciao, -- FA O tu, che porte, correndo si ? E guerra e morte ! _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
