Hi John,
You are correct that low-pass filtering a recording prior to the MP3 encodi=
ng procedure can help prevent MP3 artifacts at frequencies below that cut-o=
ff frequency. Such kind of filtering would just reduce the analog bandwidth=
of the signal that is fed into the MP3 encoder, which will finally preserv=
e more bits for the correct representation of the signal in the remaining f=
requency range.
Regards,
Raimund
--- In "rock_scallop" <> w=
rote:
>
> Hi Robin,
> I did not mean compression, I meant filtering. That is, before any MP3 co=
mpression, treatment of the 16bit or 24bit WAV file by rolling off the high=
frequencies using a parametric equalizer to attenuate the complex content =
near the anticipated MP3 cutoff frequency. Or is that what you mean by comp=
ression?
>
> MP3 seems so abrupt where it cuts off, that I assume a tailored gentle ro=
ll off must sound better. I base this on assumptions, so that is why I ask.
>
>
> John Hartog
> rockscallop.org
>
> --- In "Robin" <robin@> wrote:
> >
> > John Hartog wrote:
> >
> > > Has anyone else found that preparing a track in advance for the MP3 1=
28 kbps compression by filtering complex high frequency content above aroun=
d 14 kHz in can help avoid bad sounding MP3 artifacts?
> > >
> >
> > This may be true in edge cases. But generally it is regarded that compr=
essing first will only result in transcoding later... something to be avoid=
ed.
> >
> > I convert everything to FLAC locally and upload that way to conserve ba=
ndwidth. At least then I know I am not responsible for any lossy compressio=
n.
> >
> > -- Robin Parmar
> >
>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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