VMR-WB

The Variable Rate Multi-Mode Wideband (VMR-WB) codec is the mandatory speech codec for cdma2000® wideband telephony and multimedia streaming services and is supported in the CableLabs® PacketCable™ 2.0 specification. Designed by Nokia and VoiceAge, VMR-WB is based on the AMR-WB/ G.722.2 codec.

VMR-WB operates in the range from 0.8-13.3 kbps, including one mode of operation (mode 3) that is interoperable with AMR-WB/ G.722.2 (at 12.65 kbps and below).

The VoiceAge VMR-WB implementations are fully compliant with the 3GPP2 specification.

Platforms

For implementations of this codec on
other platforms, please contact sales@voiceage.com

Technology

	Encoded bandwidth	~ 50-7000 Hz
	Standardized	3GPP2 2004
	Coding type	ACELP® (Algebraic Code Excited Linear Prediction)
	Bit rate	8.55/4/2/0.8 kbps (Rate Set 1) 13.3/6.2/2.7/1.0 kbps (Rate Set 2)
	Delay (ms): Frame size Lookahead	20 13
	Quality	Mode 0 >= AMR-WB @ 14.25 Mode 1 > AMR-WB @ 12.65 Mode 2 > AMR-WB @ 8.85 Mode 3 > AMR-WB @ 12.65 Mode 4 uses Rate Set 1 rates with quality = Mode 2 Mode 3 is interoperable with G.722.2/AMR-WB (between 3GPP, 3GPP2 and ITU-T)
	Complexity	40 WMOPS (including VAD/CNG processing and noise reduction)
	VAD/DTX/CNG	Included
	Noise reduction	Included

Applications

Wideband telephony – cdma2000® wireless networks, Wi-Fi, VoIP, satellite telephony, video telephony
Audio and videoconferencing
Wideband multimedia services in cdma2000® wireless networks
Streaming audio over the Internet
Audio storage and playback
Voicemail
Store and forward messaging