[M4IF Technotes] What does AMR stand for?

[Nikki Cranley]

AMR - Adaptive Multi-Rate developed by ETSI! Mono type codec.
8 speech coding modes Bit rates 4.75-12.2kbps.
AMR 12.2 kbps is same speech codec as GSM Enhanced Full Rate (EFR)
Nikki
----- Original Message -----
> From: "Dave Singer" <singer   apple.com>
> To: <bruce   vici.us>; "'Alain Tritschler'" <atritschler   envivio.fr>;
"'Ralph
> Neff'" <neff   PacketVideo.COM>; <Technotes   lists.m4if.org>
> Cc: "'Ben Waggoner'" <ben   interframemedia.com>
> Sent: Monday, March 17, 2024 6:22 PM
> Subject: RE: [M4IF Technotes] What does AMR stand for? / Where's CELP
>
>
> > At 06:52 -0800 3/14/03, Bruce Schulman wrote:
> > >Alain,
> > >Is AMR used in GSM?
> >
> > The classic GSM codec is one of the AMR modes, as I understand.
> >
> > >I don't think it was useful until 2.5G or 3G.  So,
> > >would it be the case that "adaptive" bit rate is only useful in certain
> > >types of mobile communications - like packet based networks or CDMA and
> not
> > >TDMA networks.
> >
> > AMR belongs, I think, to the 3G spec., though that means that some
> > may use it on 2.5G interim networks.  Why would the kind of radio
> > suggest whether adaptivity can be done?  As long as you can detect
> > the available bandwidth somehow (e.g. from the radio layer), you can
> > adapt.
> > --
> > David Singer
> > Apple Computer/QuickTime
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