Variable-Rate Multimode Wideband (VMR-WB) is a source-controlled variable-rate multimode codec designed for robust encoding/decoding of wideband/narrowband speech. The operation of VMR-WB is controlled by speech signal characteristics (i.e., source-controlled) and by traffic condition of the network (i.e., network-controlled mode switching). Depending on the traffic conditions and the desired quality of service (QoS), one of the 4 operational modes is used. All operating modes of the existing VMR-WB standard are fully compliant with cdma2000 rate-set II. VMR-WB modes 0, 1, and 2 are cdma2000 native modes with mode 0 providing the highest quality and mode 2 the lowest ADR. VMR-WB mode 3 is the AMR-WB interoperable mode operating at an ADR slightly higher than mode 0 and providing a quality equal or better than that of AMR-WB at 12.65 kbit/s when in an interoperable interconnection with AMR-WB at 12.65 kbit/s.
| Internet media type |
audio/VMR-WB |
|---|---|
| Developed by | 3GPP2 |
| Type of format | Lossy audio |
| Contained by | 3G2, RTP |
| Extended from | AMR-WB/G.722.2 |
| Website | 3GPP2 standards |
Now also a cdma2000 rate-set I compliant mode is implemented to the coder as mode 4. The average bitrate of the mode is 6.1 kbit/s (maximum is 8.55 kbit/s). Source coding bitrates are: Rate-Set I - 8.55, 4.0, 2.0, 0.8 kbit/s, Rate-Set II - 13.3, 6.2, 2.7, 1.0 kbit/s. VMR-WB uses 16 kHz sampling frequency.[1][2] Algorithmic delay is 33.75ms.
VMR-WB can be also used in 3GPP2 container file format - 3G2.
VMR-WB was designed by Nokia and VoiceAge. It is based on AMR-WB.[2]
References
edit- ^ PacketCable 2.0 - Codec and Media Specification - PKT-SP-CODEC-MEDIA-I07-090702 (PDF), 2009, p. 87, retrieved 2011-06-23
- ^ a b VoiceAge website: VMR-WB — Source-controlled Variable Bit Rate Wideband Compression (archived), 2008-04-19, archived from the original on April 19, 2008, retrieved 2011-06-23
External links
edit- 3GPP2 specification
- RFC 4424 - Real-Time Transport Protocol (RTP) Payload Format for the Variable-Rate Multimode Wideband (VMR-WB) Extension Audio Codec
- RFC 4348 - Real-Time Transport Protocol (RTP) Payload Format for the Variable-Rate Multimode Wideband (VMR-WB) Audio Codec
- VoiceAge website: VMR-WB — Source-controlled Variable Bit Rate Wideband Compression (archived)
- VoiceAge website
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