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3. Re: High frequency recording

Subject: 3. Re: High frequency recording
From: "gus" leudar
Date: Tue Nov 9, 2010 5:01 am ((PST))
also wouldnt the type of interpoliation used come in to play here ?



--- In  "gus" <> wrote:
>
> If I understand correctly David is saying the lower the frequency the hig=
her the resoulution. For example if the sampling as 44.1 khz if you have a =
frequency of 10 khz you will have 4 samples of information representing tha=
t signal - if 22 khz only 2 etc etc it may only be half that come to think =
of it but you get the gist.....
> P.S> David - you live in North devon ? You gonna come to Eden ?
>
>
>
> --- In  "Raimund" <recordingbird@> wrote=
:
> >
> > Avocet wrote:
> >
> > > Theoretically you can sample a 20KHz input at 44.1Ks/s, but it will
> > > only have two samples per cycle, so it won't give a sensible 20KHz
> > > back. With music, anything up there is hash, but wildlife calls need =
a
> > > better reproduction than that.
> >
> > David,
> >
> > Do you think that it was impossible to perfectly reconstruct such a 20 =
kHz sine signal out of a 44.1 ks/s recording?
> >
> > I'm afraid that this issue is often poorly understood. Given that the a=
nti-aliasing filter was sharp enough (in such a way that the 20 kHz is not =
being attenuated), then it should be possible to perfectly reconstruct the =
original 20 kHz signal and play it back without introducing any distortion.=
 Digital oversampling in the D/A converter circuit can help to create a ver=
y smooth analog output signal that is (almost) identical to the original an=
alog input signal.
> >
> > Regards,
> > Raimund
> >
>








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