Hmm, IIRC there is a effect called "enhancer" that adds high
frequencies to sound that lacks them. I think it was used
for tapes ( or something else that lacks high frequencies ).
The basic idea is to find the basic tones and add higher harmonics.
One way to do it is to filter out all harmonics , then over-amplify
the signal, so that it clipps and generates a lot of harmonics and
then mix that back into the original sound.
This is done complete in analog world , so it can be applied to
almost any type of audio material.
Disclaimer : I'm not a pro audio engineer and I read this years ago.
Is there some real audio engineer on the list ?
David Balazic
Mark Taylor wrote:
>
> >
> > RE:
> > http://www.kenwoodcorp.com/i/topframes/press_sdrive_20000620.html
> >
> > Any comments?
> >
> > --
> > Dmitry Boldyrev
> > Subband Software, Inc.
> > http://www.subband.com
> >
> >
>
> This just made it into slashdot. They also seem to not know
> what is going on, but maybe some of the feedback will
> enlighten us.
>
> My guess is that they take the mp3, decode it, and then
> add noise to the spectrum above 16khz. The level of the
> noise is taken from interpolating (actually, extrapolating
> in this case) the data below 16khz. (is that what you
> mean by an audio exciter?)
>
> Sounds like snake oil to me. But maybe adding some low
> level noise actually sounds better than having silence
> above 16khz?
>
> Mark
>
> --
> MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
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