Developed jointly by Ericsson, Nokia and VoiceAge, the AMR-WB+ (Extended Adaptive Multi-Rate Wideband) speech and audio codec is the 3GPP-recommended hi-fi audio codec for MMS, PSS and MBMS services over GSM and WCDMA networks. It is also recommended for DVB-H applications.
AMR-WB+ scales to cover the full audio spectrum and uses high-efficiency parametric stereo (HE-PS) to maintain high-fidelity stereo image reproduction at even the lowest bit rates and excellent quality at higher rates.
In characterization tests carried out by third parties for the ETSI/3GPP standards organizations, at bit rates of 14 and 24 kbps for mono and 18 and 24 kbps for stereo, AMR-WB+ outperformed MPEG-4 AAC in all tests and outperformed MPEG-4 HE-AAC in seven of eight tests.
Coded AMR-WB+ media can be encapsulated in 3GPP (.3gp, i.e., MMS) or MPEG-4 (.mp4) file formats and used along the entire delivery chain in multimedia applications. The RTP payload format for AMR-WB+ has been defined by IETF, supporting interleaving for robust streaming and forward error correction (FEC) for enhanced robustness.
Emerging end-to-end digital communication systems enable the use of full audio coding in a large and varied collection of applications for mobile environments. Applications include streaming services for music, news and sports as well as multimedia messaging services for person-to-person and business-to-person communications.
Now a breakthrough technology — Extended AMR Wideband (AMR-WB+) — addresses mixed speech and audio content at low bit rates. As an extension of the AMR-WB standard, the AMR-WB+ audio codec combines advanced audio coding technology with unrivaled speech coding technology, allowing service providers to deliver consistent high-quality audio while making efficient use of their transmission capacity.
In addition to delivering rich, natural-sounding speech like AMR-WB, AMR-WB+ delivers high-quality music, voice-over-music and voice-between-music, making it perfectly suited to low-bit-rate mixed-content audio applications such as multimedia messaging; 3GPP Packet-Switched Streaming (PSS), Multimedia Broadcast/Multimedia Service (MBMS) and IMS Messaging and Presence services; streaming audio over the internet; audio storage and playback; digital radio broadcasting; archiving and distribution of narrative content and network-based language-learning applications.
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