19 Mar
2013
19 Mar
'13
12:45 a.m.
On Mon, Mar 18, 2013 at 11:28:24PM +0000, James Morris wrote:
I think the only time zero-crossings are any good is
in hand-crafted
cutting of (very) simple waveforms.
The only case where switching on zero-crossings makes sense is when
the gain control element can't perform a continuous change and switching
is the only option. That is the case with many 'electronic volume control'
chips that have e.g steps of 1 dB (or worse).
Using floating point, there is no reason to ever have sudden gain changes,
just smooth the gain value itself (at the sample rate). A critically damped
second order lowpass with a rise time of 30 ms or so will eliminate all
audible artefacts. It's very low on CPU and you only need to run it while
the gain is changing.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)