Re: Convolution, channel-selectiveness of effects and spectrograms

Martin Guy <[email protected]> Mon, 1 Dec 2025 00:59:05 +0100
Newsgroups gmane.comp.audio.sox
Message-ID <CAL4-wQoFAdzD5hg=U0s9nt1dYQS_tKkB49_roReM8ww50ErdUA@mail.gmail.com>
A third option under consideration is fixed-point FFTs as an option for
FPU-less machines (embedded systems mainly)

with 31 bits other than the sign bit, which limits the number of bins to
205887 for 2*PI/acos, enough to be useful for the usual sizes of a few thousand.
In any case, we probably want to prefer a large margin of extra precision
rather than sailing close to the theoretical limit where I assume that only just
being able to distinguish one bin from the one next to it is less
likely to produce
good results.

Thanks again for the clarifications and formulae; I'd be lost without
you in these areas

    M