[vorbis] Are there low bitrate "Voice" plans

[Tom Bishop]

MP3 sounds awefull at lower bitrates, and does a generally
poor job on voice.

I was curious if Vorbis degraded similarly...

GSM is reasonable at 1300bps,  ACELP(VoiceAge.com),
and PureVoice(Qualcomm) are both less bandwidth, and
better quality, but cost about $50K for a fairly unlimited
source license.

As far as I understand it, GSM is the best (believed to be)
patent issue free voice codec.

My company is interested in a voice codec, and I am
personally leaning towards ACELP at this time...
High price tag, but they are integrated with PSTN,
and have a pure Java decoder

It was interesting to see that there is a Vorbis decoder
in pure Java. Has anyone used it?

Regards,
Tom

----- Original Message -----
From: "Téo de Hesselle" <teo at nvnetworking.com>
To: <vorbis at xiph.org>
Sent: Friday, September 08, 2000 4:46 PM
Subject: RE: [vorbis] Are there low bitrate "Voice" plans

> > As I understand it, the codec is for music predominantly,
> > and not voice, right?
> >
> > There is a mention that the bit rate could be turned down to
> > (think it said) 8kbps, but how would that sound?
>
> Normal telephone is 9600kbps.
>
> Since mp3/vorbis can give us about 10:1 compression, If properly tuned I
> dont see why it wouldn't sound as good as a telephone call... in other
words
> good enough.
>
> However, the problem compression would introduce is lag, which will only
> decrease as computers get faster and encoders are better optimised, *but*
at
> the moment I think the lag would be unnaceptable, especially over the net
> which introduces it's own lag as well (ever pinged another dial up user
> across the globe ?)
>
> However I am not a developer or communication expert, these are just my
own
> observations.
>
> --
> Teo de Hesselle
> NV Networking
>
> teo at nvnetworking.com
> 0416 215 289
>
>
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