Quoting Chuckk Hubbard badmuthahubbard@gmail.com:
I'm teaching myself some DSP stuff, using Miller's Techniques, a Digital Filters book, and some other references, and I'm loving it. I am wondering, though, how one comes up with a complex audio signal for use in Pd. I want to experiment with [czero~], and I've also wondered where complex signals come from for [fft~]. It doesn't seem like it would be possible to create a complex signal from a real one, but maybe there are ways to synthesize them?
I thought that usual practice was to put another batch of real signals in the complex part, since they are orthogonal, no interaction, it could be anything. Complex audio sounds the same as real audio ;)
Martin