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AMR-WB was developed by Nokia [1] and VoiceAge and it was first specified by 3GPP. [2] AMR-WB is codified as G.722.2, an ITU-T standard speech codec, formally known as Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB). G.722.2 AMR-WB is the same codec as the 3GPP AMR-WB.
Extended Adaptive Multi-Rate – Wideband (AMR-WB+) is an audio codec that extends AMR-WB.It adds support for stereo signals and higher sampling rates. Another main improvement is the use of transform coding (transform coded excitation – TCX) additionally to ACELP.
The Adaptive Multi-Rate (AMR, AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR is a multi-rate narrowband speech codec that encodes narrowband (200–3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality [ 3 ] speech starting at 7.4 kbit/s.
The 'Music' category is merely a guideline on commercialized uses of a particular format, not a technical assessment of its capabilities. For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint.
AMR audio (various) 8000 20 Adaptive Multi-Rate audio RFC 4867 dynamic (or profile) AMR-WB audio (various) 16000 20 Adaptive Multi-Rate Wideband audio (ITU-T G.722.2) RFC 4867 dynamic (or profile) AMR-WB+ audio 1, 2 or omit 72000 13.3–40 Extended Adaptive Multi Rate – WideBand audio RFC 4352 dynamic (or profile) vorbis audio (various) (various)
AMR-WB (G.722.2) was developed by Nokia and VoiceAge and it was first specified by 3GPP. The traditional telephone network ( PSTN ) is generally limited to narrowband audio by the intrinsic nature of its transmission technology, TDM ( time-division multiplexing ), and by the analogue-to-digital converters used at the edge of the network, as ...
opencore-amr (one may compile ffmpeg with—enable-libopencore-amrnb to incorporate the OpenCORE lib) FFmpeg (by default decoder only, but see above the compiling options to incorporate the OpenCORE lib) AMR-WB. 3GPP TS 26.173 – AMR-WB speech Codec (C-source code) – reference implementation [12]
VMR-WB mode 3 is the AMR-WB interoperable mode operating at an ADR slightly higher than mode 0 and providing a quality equal or better than that of AMR-WB at 12.65 kbit/s when in an interoperable interconnection with AMR-WB at 12.65 kbit/s. Now also a cdma2000 rate-set I compliant mode is implemented to the coder as mode 4.