Fourier analysis may be performed mathematically if the expression f(t) describing the waveform or COMPLEX TONE is known ... A more general form of analysis for transferring a time-domain signal to ...

you can multiply the Fourier transform by -i sgn(ω), but that isn’t really going to help you much in a practical sense. If you don’t want to bog down in the math, skip immediately to section ...

We aren’t sure how hard it is to realize high-resolution ... On the other hand, we talk quite a bit about Fourier transforms, too.