Variable-Rate Multimode Wideband

Variable-Rate Multimode Wideband (VMR-WB) is a source-controlled variable-rate multimode <a href="/facts/Codec/C7b7Am8t">codec</a> 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 (<a href="/facts/Quality_of_service/joz9VkUm">QoS</a>), one of the 4 operational modes is used. All operating modes of the existing VMR-WB standard are fully compliant with <a href="/facts/Cdma2000/yF4B3rfl">cdma2000</a> 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 <a href="/facts/AMR-WB/J70f7LGx">AMR-WB</a> 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.
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. Algorithmic delay is 33.75ms.
VMR-WB can be also used in <a href="/facts/3GPP2/6bNoq0n6">3GPP2</a> container file format - <a href="/facts/3GP/EYCqToLu">3G2</a>.
VMR-WB was designed by <a href="/facts/Nokia/bCleFoF4">Nokia</a> and VoiceAge. It is based on AMR-WB.

Variable-Rate Multimode Wideband open-in-new

Variable-Rate Multimode Wideband