Hallo!
The help for fft~ says (for that rfft~ at least) the left and right outputs can be considered as the coefficents of cosine and sine respectively. Does this mean that if frequency and phase of a sinusoid can br represented as A*sin(2*PI*f*t)+B*cos(2*PI*f*t), then the left output of fft~ is B and the right output is A? If so, how do I get frequency and phase? (My calculus book is back in Boulder)
well, the output of a fft (or rfft) are complex numbers - the left output is the real part, right the imaginary part. And as you can represent complex numbers with cos + sin - you have the representation from above. If you want the amplitude+phase you have to convert these numbers from rectangular to polar coordinates.
If I am going to convolve the two signals - multiply in the frequency domain - what happens to phase?
convolution is a simply multiplication, but it's a multiplication of complex numbers ... (and it's of course different, when you use rectangular or polar representation)
LG Georg