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Topic: Are all modes of AMR NB mandatory in phones? (Read 4025 times) previous topic - next topic
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Are all modes of AMR NB mandatory in phones?

Dear All,

I have a question on the implementation of AMR modes.


AMR NB has 8 different modes depending on bitrates(from 4.75 kbps ~ 12.2 kbps),
and the required computation is different for each mode.


Are the 8 modes must supported in the AMR codec for 3G mobile phones?



Thanks in advance.

Are all modes of AMR NB mandatory in phones?

Reply #1 –
I am not sure but I think so, at least for GSM. A bit more uncertain about UMTS (3G). If you con't get a more conclusive answer from someone else I suggest you download the specs from 3gpp.org and find out for yourself, but that is of course quite cumbersome...