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Overview

The GSM Adaptive Multi-Rate Narrow Band (AMR or AMR NB) speech codec is used in the GSM and UMTS mobile telephony systems. It was adopted as a standard speech codec by the 3GPP organization. The format is often used to record speech audio or ringtones also.

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 standards 3GPP TS 26.071 and 3GPP TS 26.073 Passes conformance test suite 3GPP TS 26.074 Bitrates: 4.75, 5.15, 5.9, 6.7, 7.4, 7.95, 10.2, 12.2 kbps For half rate and full rate channels Voice Activity Detection (VAD): VAD1 and VAD2 Comfort Noise Generation (CNG) Discontinuous Transmission (DTX)

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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