On Sat, 13 May 2023 06:49:31 +0200 ichthyo <p...@ichthyostega.de> wrote:
Anyway, the good news is that by a quick check there is no obvious
*audible* difference. From looking closely at the waveforms, I get the
impression that the filter also behaves similar, and we've just gotten a
minute phase shift, which is most notably at the lower frequencies.
Am 13.05.23 um 13:49 schrieb Will Godfrey:
Holding a C maj chord starting from middle C produced a nice rich spectrum
in both displays, with the classic tail off at around 10kHz, and lots of
visible beating. Overall the harmonic lines seemed identical. However the
*pattern* of amplitude variations from the beats was quite different.
Interesting. Another observation is that the residual wave, i.e. the difference
computed by the Testrunner, does not sound distorted, but rather like a low-pass
filtered variant of the original sound; this would also be consistent with a
minute phase shift.
What I will do now is to dig out one of my patches that adds debugging messages
of actual computed numbers. In the past, running such builds and comparing the
traces turned out a good way to narrow down the point where the actual numeric
change manifests. At least I am curious now and want to understand what is
going on....
-- Hermann
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