[vorbis-dev] Idea for gapless tracks

Beni Cherniavsky cben at crosswinds.net
Thu Jan 4 00:13:39 PST 2001

Marshall Eubanks wrote:
> Davy Durham wrote:
> >
> > You'd probably better make it more like 1024 or so... You'll hear a definate
> > "thup" at lower volume levels with small transition sizes..... No matter how you
> > smooth it, you're adding some sort of artifact into the audio... just make it a
> > low enough frequency that *people* won't perceive it..
> >
> > --Davy
> Yeah, that would put it down at about 20 hz or so, which is low enough
> not to
> be audible. Of course, for about 20 msec or so, the higher frequencies
> will be surpressed,
> which could in theory be audible, but probably wouldn't be in practice.

Instead of smoothing you can cross-mix, which is implemented in many
players anyway.  If you need sample-precision you can extrapolate both
signals a little with the spectrums they have at their begginings /
ends.  Maybe you can use the extra samples that the encoder puts in
and marks to be cropped - you can add a flag to encoder to force it
leaving so minimal extra samples on both ends - but I'm afraid that
this abuses the specification, since another encoder is permitted to put
any garbage he wants there.  So better put it in the player.
In any case I'm not sure whether it would sound better :-)

Beni Cherniavsky <cben at crosswinds.net>
                 (also scben at t2,cben at tx in Technion)

  No, No! You're not thinking; you're just being logical.
                                             - Niels Bohr

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