On Tue, Jun 30, 2009 at 10:05 PM, Steve Underwood
<steveu@coppice.org> wrote:
Edmar Cruz wrote:
> So what codec supports mobile phones?
>
The main codecs used by mobile phones are:
GSM FR The original GSM code, largely replaced by later
codecs (some VoIP stuff uses this)
GSM HR The half rate codec for GSM
GSM EFR A later improved full rate codec that largely replaced
GSM FR on GSM networks
AMR-NB The current start of the art narrowband codec for GSM
and UMTS networks
AMR-WB The wide band codec for UMTS, though most networks
seem to block it
EVRC The main codec for the CDMA networks
Each of these codecs sounds pretty respectable, and G.729 sounds pretty
respectable. However, if you transcode from one to another the result
can be pretty bad.
Steve