Amr-wb codec wiki

Pages Blog. Page tree. Browse pages. A t tachments 0 Page History. Jira links. Created by Jared K. Smith , last modified by Paul Trudel on 01 Feb , General Information Refer to the topic for information on payload sizes and payload types. Multimedia is not supported. AMR-WB supports the following compression rates: 6. Passing HD Audio through the IMG can be achieved, however the signal on the outgoing side will be degraded so it is no longer a High Definition quality signal.

AMR-WB provides improved speech quality due to a wider speech bandwidth of 50— Hz compared to narrowband speech coders which in general are optimized for POTS wireline quality of — Hz. There also exists another storage format for AMR-WB that is suitable for applications with more advanced demands on the storage format, like random access or synchronization with video. The lowest bit rate providing excellent speech quality in a clean environment is Higher bit rates are useful in background noise conditions and for music.

Also, lower bit rates of 6. The frequencies from 6. All modes are sampled at 16 kHz using bit resolution and processed at When used in mobile phone networks, there are three different configurations combinations of bitrates that may be used for voice channels:.

This limitation was designed to simplify the negotiation of bitrate between the handset and the base station, thus vastly simplifying the implementation and testing. All other bitrates can still be used for other purposes in mobile phone networks, including multimedia messaging, streaming audio, etc. Its speech quality is high, but older networks will have to be upgraded to support a wideband codec.

AMR-WB is also a widely adapted format in mobile handsets for ringtones. The AMR wideband speech format shall be supported in 3G multimedia services when wideband speech working at 16 kHz sampling frequency is supported.