GSM - AMR

GSM/AMR product is a complete implementation of the Global System for Mobile (GSM) Adaptive Multi-Rate (AMR) voice coder, and is fully compliant with the ETSI GSM 06.90 specification.

The Adaptive Multi Rate (AMR) speech codec is the default speech codec for GSM 2+ and WCDMA third generation wireless systems. GSM-AMR is based on Algebraic CELP (ACELP) and operates at eight bit rates ranging from 4.75 kbps to 12.2 kbps. It is developed to preserve high speech quality under a wide range of transmission conditions. The AMR codec is designed with a voice activity detector (VAD) and generation of comfort noise (CNG) parameters to reduce the number of transmitted bits and packets during silence periods.

Technical Specification

• Performs compression and decompression of all 8 specified data rates, ranging from 4.75 kbps to 12.2 kbps
• Includes support for frame substitution and muting (GSM 06.91)
• Includes support for comfort noise generation (GSM 06.92)
• Includes support for DTX - Discontinuous Transmission (GSM 06.93)
• Includes support for VAD - Voice Activity Detection (GSM 06.94)
• Supports a C callable API for initialization / encoding and decoding
• Supports Multi channel Capability

Applications

• Wireless basestations and handset " Voice over Packet Gateways
• Streaming Media Servers

Platforms

• Currently supported on TI C64x™ (TMS320C64xx™) and TI C64x+™/DaVinci™ (DM644x™)
• For further details contact mkt@ittiam.com

For a demonstration of GSM-AMR capabilities contact mkt@ittiam.com