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. This greatly improves the generic audio coding. Automatic switching between transform coding and ACELP provides both good speech and audio quality with moderate bit rates.
As AMR-WB operates at internal sampling rate 12.8 kHz, AMR-WB+ also supports various internal sampling frequencies ranges from 12.8 kHz to 38.4 kHz. AMR-WB uses 16 kHz sampling frequency with a resolution of 14 bits left justified in a 16-bit word. AMR-WB+ uses 16/24/32/48 kHz sampling frequencies with a resolution of 16 bits in a 16-bit word.[1]
3GPP originally developed the AMR-WB+ audio codec for streaming and messaging services in Global System for Mobile communications (GSM) and Third Generation (3G) cellular systems. Its primary target applications are Packet-Switched Streaming service (PSS), Multimedia Messaging Service (MMS) and Multimedia Broadcast and Multicast Service (MBMS).
File storage of AMR-WB+ encoded audio is specified within the 3GPcontainer format, 3GPP-defined ISO-based multimedia file format defined in 3GPP TS 26.244.[2]
The AMR-WB+ codec has a wide bit-rate range, from 5.2 to 48 kbit/s. Mono rates are scalable from 5.2 to 36 kbit/s, and stereo rates are scalable from 6.2 to 48 kbit/s, reproducing bandwidth up to 20 kHz (approaching CD quality). Moreover, it provides backward compatibility with AMR wideband.
In September 2005, VoiceAge Corporation announced availability of AMR-WB+ decoder in Helix DNA Client.[3][4]
Licensing and patent issuesedit
AMR-WB+ compression incorporate several patents of Nokia Corporation, Telefonaktiebolaget L. M. Ericsson and VoiceAge Corporation. [5] VoiceAge Corporation is the License Administrator for the AMR and AMR-WB+ patent pools. VoiceAge also accepts submission of patents for determination of their possible essentiality to these standards. [6]
The initial fee for applications using "real-time channels" with AMR-WB+ is $6,500. Minimum annual royalty shall be $10,000, excluding the initial fee in year 1 of the license agreement.[5]
AMR-WB+ monaural decoder in a category of personal computer products is licensed for free. Stereo AMR-WB+ decoder for personal computer products is licensed for $0.30.[5]
^"Media Type Registration". 7.1. RTP Payload Format for the Extended Adaptive Multi-Rate Wideband (AMR-WB+) Audio Codec. p. 31. sec. 7.1. doi:10.17487/RFC4352. RFC 4352.
^"State-of-the-art AMR-WB+ Hi-fi Audio Compression is Now Available for Helix". sys-con. 2005-09-28. Retrieved 2009-09-11.
^"AMR-WB+ audio codec being integrated into Helix". Helix Community mailinglist. 2005-09-28. Retrieved 2009-09-11.
^ abcVoiceAge Corporation (2007-10-14). . VoiceAge Corporation. Archived from the original on 2007-10-14. Retrieved 2009-09-12.
^VoiceAge Corporation. . VoiceAge Corporation. Archived from the original on 2007-10-14. Retrieved 2009-09-12.
External linksedit
3GPP codecs specifications; 3G and beyond / GSM, 26 series
RFC 4352 – RTP Payload Format for the Extended Adaptive Multi-Rate Wideband (AMR-WB+) Audio Codec
RFC 4281 – The Codecs Parameter for "Bucket" Media Types
October 31, 2023
extended, adaptive, multi, rate, wideband, audio, codec, that, extends, adds, support, stereo, signals, higher, sampling, rates, another, main, improvement, transform, coding, transform, coded, excitation, additionally, acelp, this, greatly, improves, generic,. 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 This greatly improves the generic audio coding Automatic switching between transform coding and ACELP provides both good speech and audio quality with moderate bit rates Extended Adaptive Multi Rate Wideband AMR WB Internet media typeaudio amr wb audio 3gppType of formatAudioContained by3GPExtended fromAMR WBAs AMR WB operates at internal sampling rate 12 8 kHz AMR WB also supports various internal sampling frequencies ranges from 12 8 kHz to 38 4 kHz AMR WB uses 16 kHz sampling frequency with a resolution of 14 bits left justified in a 16 bit word AMR WB uses 16 24 32 48 kHz sampling frequencies with a resolution of 16 bits in a 16 bit word 1 3GPP originally developed the AMR WB audio codec for streaming and messaging services in Global System for Mobile communications GSM and Third Generation 3G cellular systems Its primary target applications are Packet Switched Streaming service PSS Multimedia Messaging Service MMS and Multimedia Broadcast and Multicast Service MBMS File storage of AMR WB encoded audio is specified within the 3GP container format 3GPP defined ISO based multimedia file format defined in 3GPP TS 26 244 2 The AMR WB codec has a wide bit rate range from 5 2 to 48 kbit s Mono rates are scalable from 5 2 to 36 kbit s and stereo rates are scalable from 6 2 to 48 kbit s reproducing bandwidth up to 20 kHz approaching CD quality Moreover it provides backward compatibility with AMR wideband Contents 1 Software support 2 Licensing and patent issues 3 See also 4 References 5 External linksSoftware support editIn September 2005 VoiceAge Corporation announced availability of AMR WB decoder in Helix DNA Client 3 4 Licensing and patent issues editAMR WB compression incorporate several patents of Nokia Corporation Telefonaktiebolaget L M Ericsson and VoiceAge Corporation 5 VoiceAge Corporation is the License Administrator for the AMR and AMR WB patent pools VoiceAge also accepts submission of patents for determination of their possible essentiality to these standards 6 The initial fee for applications using real time channels with AMR WB is 6 500 Minimum annual royalty shall be 10 000 excluding the initial fee in year 1 of the license agreement 5 AMR WB monaural decoder in a category of personal computer products is licensed for free Stereo AMR WB decoder for personal computer products is licensed for 0 30 5 See also editAdaptive Multi Rate AMR Adaptive Multi Rate Wideband AMR WB 3GP Comparison of audio coding formats RTP audio video profileReferences edit 3GPP TS 26 290 Audio codec processing functions Extended Adaptive Multi Rate Wideband AMR WB codec Transcoding functions Page 10 Retrieved on 2009 07 08 Media Type Registration 7 1 RTP Payload Format for the Extended Adaptive Multi Rate Wideband AMR WB Audio Codec p 31 sec 7 1 doi 10 17487 RFC4352 RFC 4352 State of the art AMR WB Hi fi Audio Compression is Now Available for Helix sys con 2005 09 28 Retrieved 2009 09 11 AMR WB audio codec being integrated into Helix Helix Community mailinglist 2005 09 28 Retrieved 2009 09 11 a b c VoiceAge Corporation 2007 10 14 AMR WB Licensing Terms VoiceAge Corporation Archived from the original on 2007 10 14 Retrieved 2009 09 12 VoiceAge Corporation Licensing Patent Calls VoiceAge Corporation Archived from the original on 2007 10 14 Retrieved 2009 09 12 External links edit3GPP codecs specifications 3G and beyond GSM 26 series 3GPP TS 26 290 Audio codec processing functions Extended Adaptive Multi Rate Wideband AMR WB codec Transcoding functions RFC 4352 RTP Payload Format for the Extended Adaptive Multi Rate Wideband AMR WB Audio Codec RFC 4281 The Codecs Parameter for Bucket Media Types Retrieved from https en wikipedia org w index php title Extended Adaptive Multi Rate Wideband amp oldid 1130217087, wikipedia, wiki, book, books, library,
