[PD] dac object question
mstamm at itin.fr
mstamm at itin.fr
Sun Jul 11 23:58:45 CEST 2004
Thanks to all for yours answers.
Selon Mathieu Bouchard <matju at sympatico.ca>:
> On Thu, 8 Jul 2004, Frank Barknecht wrote:
> > first: thanks a lot for explaining the DC effects to you and to Lex. I
> > did however ask my question slightly ambivalent. I also would be
> > interested in why and how a [hip~ 5] filter removes a DC offset.
> why: because DC is, in some way, a 0 (zero) Hz wave, and by definition
> "High Pass Filter" means something that cuts off low frequencies, which
> would include 0.
> how: I don't know how [hip~] works, and that is implementation-dependent,
> that is, there are many kinds of high-pass filters.
> > And related to that: What would be the best way to make sure you get
> > no DC offset?
> Filter out the DC whereever it is where you don't want it, and don't
> filter it where you don't care about it. How you do it exactly is your own
> > I normally don't use sound input, so are there other possible sources
> > to watch out for in purely algorithmic patches, which might generate a
> > DC offset without intention? I see that a phasor introduces a DC
> > offset, but should I watch out for less obvious offset sources, maby
> > filters and the like?
> Depends what you call "without intention"... squaring a signal (e.g.
> [expr~ $v1*$v1]) always introduces some DC. It is useful, too. The RMS
> volume is defined as the square root of the DC of the square of a signal.
> For other filters I don't really know. If you want to probe for DC, you
> can do it, using something like [lop~ 1] -> [snapshot~].
> Makes sense?
> Mathieu Bouchard http://artengine.ca/matju
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