[vorbis] Low bitrate encoding [non-mockery]

[Erik J. Kruus]

Olaf van der Spek wrote:

> ----- Original Message -----
> From: "Monty" <xiphmont at xiph.org>
>
> > On Tue, Jan 09, 2001 at 11:49:09AM +0100, Olaf van der Spek wrote:
> > > Is downsampling (from 44100 hz to 22500 hz) something else then just
> taking
> > > the average of two samples from the read buffer and putting that in the
> > > write buffer?
> >
> > Yes!! Anyone who does it this way will be mocked.  Just warning you :-)
>
> Mocked? I did it this way, what now?
>

Now I ask you to read about how sox does it better at two URLS.
Sox has three ways, compared with graphs and interpretation
at

          http://leute.server.de/wilde/resample.html

The best way, mathematically, I think is described at

          http://www-ccrma.stanford.edu/~jos/resample/resample.html

You can obtain this algorithm separately from sox.  Last I looked, the
most recent version of this algorithm had made it into sox 12.17.

Thanks for taking the time to read up on it.  A web search for
"resampling" will turn up a ton of links, if you have time for that
sort of stuff.

Erik.

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