Extended Adaptive Multi-Rate - Wideband (AMR-WB+)

Internet media type	audio/amr-wb+, audio/3gpp
Type of format	Audio
Contained by	3GP
Extended from	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. 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 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 5.2–48 kbit/s. Mono rates are scalable from 5.2–36 kbit/s, and stereo rates are scalable from 6.2–48 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 links

[edit] Software support

In September 2005, VoiceAge Corporation announced availability of AMR-WB+ decoder in Helix DNA Client.^[3][4]

[edit] Licensing and patent issues

AMR-WB+ compression incorporate several patents of Nokia Corporation, Telefonaktiebolaget L. M. Ericsson and VoiceAge Corporation.^[5][6] 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.^[7][8]

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][6]

AMR-WB+ monoural 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][6]

[edit] See also

• Adaptive Multi-Rate (AMR)
• Adaptive Multi-Rate Wideband (AMR-WB)
• 3GP
• Comparison of audio codecs

[edit] References

1. ^ 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
2. ^ RFC 4352, page 30
3. ^ "State-of-the-art AMR-WB+ Hi-fi Audio Compression is Now Available for Helix". sys-con. 2005-09-28. http://www.sys-con.com/node/135572. Retrieved 2009-09-11. 
4. ^ "AMR-WB+ audio codec being integrated into Helix". Helix Community mailinglist. 2005-09-28. http://lists.helixcommunity.org/pipermail/helix-client-announce/2005-September/000018.html. Retrieved 2009-09-11. 
5. ^ ^{a b c} VoiceAge Corporation (2007-10-14). "AMR-WB+ Licensing Terms". Archive.org. http://web.archive.org/web/20071014161444/www.voiceage.com/amrwbplus_licterms.php. Retrieved 2009-09-12. 
6. ^ ^{a b c} VoiceAge Corporation (2006-11). "AMR-WB+ Licensing Terms". VoiceAge Corporation. http://www.voiceage.com/amrwbplus_licterms.php. Retrieved 2009-09-12. 
7. ^ VoiceAge Corporation. "Licensing - Patent Calls". VoiceAge Corporation. http://www.voiceage.com/licpatentcalls.php. Retrieved 2009-09-12. 
8. ^ VoiceAge Corporation (2007-10-14). "Licensing - Patent Calls". Archive.org. http://web.archive.org/web/20071014161420/http://www.voiceage.com/licpatentcalls.php. Retrieved 2009-09-12. 

[edit] External links

• 3GPP 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

v • d • e Multimedia compression formats Video compression ISO/IEC MJPEG · Motion JPEG 2000 · MPEG-1 · MPEG-2 (Part 2) · MPEG-4 (Part 2/ASP · Part 10/AVC) · HVC ITU-T H.120 · H.261 · H.262 · H.263 · H.264 · H.265 Others AMV · AVS · Bink · CineForm · Cinepak · Dirac · DV · Indeo · OMS Video · Pixlet · RealVideo · RTVideo · SheerVideo · Smacker · Sorenson Video · Theora · VC-1 · VP6 · VP7 · VP8 · WMV  · XVD Audio compression ISO/IEC MPEG-1 Layer III (MP3) · MPEG-1 Layer II · MPEG-1 Layer I · AAC · HE-AAC · MPEG-4 ALS · MPEG-4 SLS · MPEG-4 DST ITU-T G.711 · G.718 · G.719 · G.722 · G.722.1 · G.722.2 · G.723 · G.723.1 · G.726 · G.728 · G.729 · G.729.1 Others AC3 · AMR · AMR-WB · AMR-WB+ · Apple Lossless · ATRAC · DRA · FLAC · GSM-FR · GSM-EFR · iLBC · Monkey's Audio · μ-law · Musepack · Nellymoser · OptimFROG · RealAudio · RTAudio · SHN · SILK · Siren · Speex · TwinVQ · Vorbis · WavPack · WMA · True Audio Image compression ISO/IEC/ITU-T JPEG · JPEG 2000 · JPEG XR · lossless JPEG · JBIG · JBIG2 · PNG · WBMP Others APNG · BMP · DjVu · EXR · GIF · ICER · ILBM · MNG · PCX · PGF · TGA · TIFF Media containers General 3GP · ASF · AVI · Bink · DMF · DPX · EVO · FLV · GXF · M2TS  · Matroska · MPEG-PS · MPEG-TS · MP4 · MXF  · Ogg · QuickTime · RealMedia · RIFF · Smacker · VOB Audio only AIFF · AU · WAV See Compression methods for methods and Compression software implementations for codecs

This article related to telecommunications is a stub. You can help Wikipedia by expanding it. v • d • e