[vorbis] need speech and music in one

[gtgbr at gmx.net]

f u wrote:
> I believe that even 8khz Mono would be satisfactory
> for such voice but my understanding is that ogg
> doesn't go that low.  Now that speex has joined xiph,
> will ogg be able to handle the low end for speech?

8kHz is well possible with Vorbis. Try qualities -1 to 1 with 8kHz/mono
and 11kHz/mono input, to find a version that you like best. You'll
likely find Vorbis to give acceptable results down to 12-16 kbps.
8kHz/mono @ -q -1 is *really* low-end, however, I'm sure the result will
be better than your MP3 in any case. Make sure that you use the 1.0
release of Ogg Vorbis for your experiments.

Speex is a pure voice codec, so you're unlikely to get very great
results if your voice samples also contain music (although I must admit
that I haven't done any tests, yet, since I have zero speech samples to
play with). If there are voice-only samples, you'll get much better
results with Speex at even lower bitrates than with Vorbis.

<p>Moritz
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