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Overview

The Extended Adaptive Multi-Rate Wideband (AMR WB+) speech codec extends GSM AMR WB to support stereo signals and higher sampling frequencies. The codec also uses transform coding to increase the audio quality further. Both mobile telecommunication and voice over IP (VoIP) networks adopt the codec, as well as video broadcast standards such as DVB.

Benefits

Codecs are Fully Compliant: Bit exact thorough testing against standard and test vectors Codecs are Certified: E.g. codecs went through Dolby, Microsoft certification Robustness - no hanging: Codecs are thoroughly tested including floating inverted bits tests Error resilience: Dependent on standard, codecs fill gaps introduced by transmission errors Codecs developed in-house: Issues that may arise are quickly handled by Virage Logic?s in-house DSP experts Tested using a large suite of bitstreams: From standard holder, in-house generated, live generated, from customers, etc.

Features

Compliant to 3GPP TS 26.290 Compression technology for mixed speech and audio content Wide range of bit rates: 6 to 36Kbps for mono 7 to 48Kbps for stereo Delivers high-quality music, speech-over-music, and speech-between-music solutions All AMR-WB speech codec modes 1-9 AMR-WB VAD and DTX AMR-WB+ extends the AMR-WB codec by adding TCX, bandwidth extension, and stereo

Deliverables

Datasheet lists features and characteristics Full C source code for ease of integration and further differentiation Test harness (runs out of box on FPGA or simulator) Run on ARC s XCAM cycle-accurate simulation models Quick and easy performance and I/O measurements Optimize core configuration: cache sizes & configuration, ICCM/DCCM size, busses, etc. Reference Design for multi-codec use cases available Integrated into ARC s Media Software Framework and MQX RTOS Codecs allow multiple instances to be run in parallel Documentation: Datasheet, Release Notes, Getting Started Guide, Reference Document, Code examples All Codecs developed, delivered and supported by Virage Logic staff

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