GSM AMR NB

Overview

SPIRIT Adaptive Multi-Rate Narrowband (AMR-NB) GSM speech transcoder is a codec with 4.75 - 12.2 bit rate range. Based on code excited linear predictive (ACELP) model, the codec is fully compliant to the ETSI GSM 06.90 specification.

This speech coder is mainly used for toll quality speech compression in the 2nd+ generation mobile telephony applications.

Features

Eight input bitrates available (4.75, 5.15, 5.9, 6.7, 7.4, 7.95, 10.2, 12.2 kbit/sec)
Encoder input in the form of 20 ms frames (160 samples per frame, sampled at 8 kHz)
Decoder output in the form of 20 ms frames (160 samples per frame)
Substitution and muting of lost frames
Discontinuous Transmission (DTX) support
Voice Activity Detection (VAD) support
Comfort Noise Generation (CNG) support
Simple application interface
Code is reentrant, supports multithreading and dynamic memory allocation
Can be easily ported to any DSP or RISC platform

Benefits

Highly optimized code ideal for resource constrained applications
Easy integration and fast time-to-market

IF YOU ARE DESIGNING:

Trunking Gateway
Access Gateway
IP-PBX
Media Server

look at

TeamSpirit® Embedded

AVAILABILITY

TI TMS320C64xx
MS Windows DLL