|
|
 |
|
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. |
|
Platforms
For implementations of this codec on
other platforms, please contact sales@voiceage.com
|
|
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.
Technology
| |
Encoded bandwidth |
~ 50-19200 Hz |
| |
Standardized |
3GPP 2004 |
| |
Coding type |
Hybrid ACELP®/TCX (Algebraic Code Excited Linear Prediction/Transform-Coded Excitation) |
| |
Bit rate |
Mono: 6-36 kbps
Stereo: 7-48 kbps |
| |
Delay (ms):
Frame size
Lookahead |
80 x 25.6/Fs where Fs is the internal sampling frequency in kHz
10 x 25.6/Fs
|
| |
Quality |
- For any content, equal or better performance than any other codec available in 3GPP
- Speech quality better than AMR-WB and HE-AAC
- High-quality music, better than HE-AAC at low bit rates (<= 18 kbps)
|
| |
Decoder complexity |
Below 24 kbps:
Mono: 8 WMOPS
Stereo: 24 WMOPS
RAM: 13 Kwords
ROM: 20 Kwords |
Applications
-
Server-based streaming (PSS): music and other audio content in mono and stereo, movies, video clips, news programming, sports events, audio books, commercial advertisements, access to multimedia information systems, interactive gaming, “infotainment”
-
Download services: hi-fi ringtones, music, video clips, movie trailers, audio books
-
Multimedia Messaging Services (MMS): person-to-person messaging, application-to-person messaging, instant messaging
-
Multimedia Broadcast/Multicast Service (MBMS): live TV, radio programming, multi-player interactive gaming, commercial advertisements
-
Media players, media servers, media gateways
-
Content creation tools
|
|
| |
|
|
|
|
|
