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AMR 3GPP defined, mandatory speech codec in UMTS 3G networks Narrowband codec (8kHz audio sampling rate) Frame-based with 20ms frames Multi-rate: has 8 encoding modes with bit-rate between 12.2 and 4.75 kbps. Has comfort noise generation (SID) and DTX. The SID (Silence Descriptor) is sent in every 8th frame and is 5 bytes in size. |