Variable Rate Multi-Mode Wideband (VMR-WB)

The Variable Rate Multi-Mode Wideband (VMR-WB) codec was standardized by 3GPP2 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 and includes one mode of operation that is interoperable with it.

Wideband spread spectrum (CDMA) systems use rate sets comprised of 4 bit rates referred to as full-rate (FR), half-rate (HR), quarter-rate (QR), and eighth-rate (ER). CdmaOne and cdma2000 systems support two rate sets, referred to as Rate-Set I and Rate-Set II.

 

FR

HR

QR

ER

Rate-Set I

Source-coding bit rate (kbps)

8.55

4.0

2.0

0.8

Channel bit rate including error detection bits (kbps)

9.6

4.8

2.4

1.2

Rate-Set II

Source-coding bit rate (kbps)

13.3

6.2

2.7

1.0

Channel bit rate including error detection bits (kbps)

14.4

7.2

3.6

1.8


VMR-WB operates in four modes in Rate-Set II and one mode in Rate-Set I. Modes 0 to 3 operate in Rate-Set II. Modes 0, 1, and 2 are specific to CDMA systems (i.e., TIA/EIA/IS-95, cdma2000), with mode 0 providing the highest quality and mode 2 the lowest average data rate (ADR). Mode 3 is interoperable with AMR-WB/G.722.2 at 12.65 kbps and below. Mode 4 is compliant with Rate-Set I, with an ADR slightly lower than mode 2 and equivalent or better quality.

Applications include wideband telephony (cdma2000 wireless networks, Wi-Fi, VoIP, satellite telephony, video telephony), conferencing, wideband multimedia services in cdma2000 wireless networks, streaming audio over the internet, audio storage and playback, voicemail and store-and-forward messaging.

For licensing IPR, please contact licensing@voiceage.com.

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
Copyright © 2014 VoiceAge Corporation. All rights reserved. Home     IPR-Portfolio     Licensing     Company     Français