[M4IF Technotes] What does AMR stand for? / Where's CELP

[Dave Singer]

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