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AMR-WB 3GPP specified codec, mandatory in UMTS 3G if wideband supported Wideband codec (16kHz audio sampling rate) Frame-based with 20ms frames Multi-rate encoding at 9 different rates between 23.85 and 6.6 kbps Has built in support for DTX and comfort noise (SID) SID (silence descriptor) is sent every 8th frame and is 5 bytes in size |