Each AMR-WB codec mode follows the generic frame structure depicted in figure 1. The frame is divided into three
parts: AMR-WB Header, AMR-WB Auxiliary Information, and AMR-WB Core Frame. The AMR-WB Header part
includes the Frame Type and the Frame Quality Indicator fields. The AMR-WB auxiliary information part includes the
Mode Indication, Mode Request, and Codec CRC fields. The AMR-WB Core Frame part consists of the speech
parameter bits or, in case of a comfort noise frame, the comfort noise parameter bits. In case of a comfort noise frame,
the comfort noise parameters replace Class A bits of AMR-WB Core Frame while Class B and C bits are omitted.
references:
https://www.etsi.org/deliver/etsi_ts/126200_126299/126201/05.00.00_60/ts_126201v050000p.pdf
parts: AMR-WB Header, AMR-WB Auxiliary Information, and AMR-WB Core Frame. The AMR-WB Header part
includes the Frame Type and the Frame Quality Indicator fields. The AMR-WB auxiliary information part includes the
Mode Indication, Mode Request, and Codec CRC fields. The AMR-WB Core Frame part consists of the speech
parameter bits or, in case of a comfort noise frame, the comfort noise parameter bits. In case of a comfort noise frame,
the comfort noise parameters replace Class A bits of AMR-WB Core Frame while Class B and C bits are omitted.
references:
https://www.etsi.org/deliver/etsi_ts/126200_126299/126201/05.00.00_60/ts_126201v050000p.pdf
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