Subject: Re: [linux-audio-dev] Dithering idiots
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Mon Jun 17 2002 - 15:49:44 EEST
On Mon, Jun 17, 2002 at 01:16:14 +0200, Dave Griffiths wrote:
> > But what if (as Bill says) a peak falls initially between the graphical
> > sample points and then when you change the graphical resolution and resample
> > it suddenly appears? Ok, this would probably only occur for some potentially
> > very steep transients but surely peaks could get missed? When your graphical
> > resolution is lower than your sample resolution (which, let's face
> > it is going to be true always) then how should you interpret the
> > underlying envelope?
>
> Yep, the PoshSampler SSM plugin suffers from this also, it's really just the
> same problem as audio sampling, I tried a few quick fixes, but doing proper
> antialiasing should sort it out.
Right, I misread the question, but my PS point is appropriate. In order to
find the amplitude at a given, fractional sample point you should be using
sinc interpolation.
- Steve
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