12 Adaptive Multi-Rate Wideband speech codec frame structure

26.1713GPPAdaptive Multi-Rate - Wideband (AMR-WB) speech codecGeneral descriptionSpeech codec speech processing functionsTS

The adaptive multi-rate wideband speech frame structure is described in [9]. The output interface format from the encoder and input interface format to the decoder is divided into two parts; the core speech data part, which is the speech coded bits, and the other part is an additional data part with mode information.

The interface format described in [9] is termed AMR-WB interface format 1 (AMR-WB IF1).

Annex A of [9] describes an octet aligned frame format which shall be used in applications requiring octet alignment, such as for 3G H.324. This format is termed AMR-WB interface format 2 (AMR-WB IF2).