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Specialists in Speech and Audio Software Development
ETSI NB-AMR
The ETSI standard AMR (Adaptive Multi-Rate) narrow band speech codec belongs to the ACELP family of speech coders. Narrow band AMR operates at eight different bit rates from 4.75kbps to 12.2kbps and incorporates the second-generation vocoder standards EFR-GSM (12.2kbps mode) and IS-641-A (7.4kbps mode). Discontinuous transmission (DTX) functionality is also part of the standard with a choice of two different Voice Activity Detection (VAD) algorithms, VAD1 and VAD2. The ESPICO software includes both algorithms. The codec operates on speech frames of 20ms (160 samples) with a 5ms look-ahead.
The ESPICO implementations are highly optimised, realising low memory and MHz requirements. Contact ESPICO for specific resource requirements.
Features
- Encodes and decodes GSM-AMR bit-streams compliant with ETSI GSM 06.90
- Supports Voice Activity Detection (VAD) ETSI GSM 06.93
- Supports Discontinuous Transmission (DTX) ETSI GSM 06.94
- Supports Comfort Noise Generation (CNG)
- Supports substitution and muting of lost frames
Availability
ESPICO’s optimised solution can be ported to any platform. Available solutions include:
- ZSP Cores including ZSP400, ZSP500, ZSP800 families
- ARM including Cortex and NeonTM
- MIPS32 74KTM
- Ceva DSP Cores
Applications
- Digital cellular telecommunications
- VoIP
- Wireless communications
- IP-PBX
| Platforms |
| Contact |
| Application |
| About Us |
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| Audio |
| Speech |
| ITU G.711 |
| ITU G.722 |
| ITU G.726 |
| ITU G.728 |
| iLBC |
| OPUS |
| iSAC |
| CELT |
| SILK |
| ETSI NB-AMR |
| ETSI WB-AMR |
| ETSI WB-AMR+ |
| ETSI HR |
| ETSI EFR |
| ETSI FR |