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About Us
Consilient develops optimised software algorithms involved in voice, data, fax and video communications. We also provide integrated solutions for the embedded and networked markets.
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In the fast-evolving world of mobile communication, delivering clear, high-quality voice calls over LTE networks has become a fundamental necessity. Consilient's VoLTE Voice Engine is at the forefront of this technological revolution, offering a superior voice-over LTE (VoLTE) service solution.
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In today's digital age, clear and effective communication is paramount. Whether for business meetings, virtual conferences, or personal calls, superior voice quality can significantly impact the user experience. Consilient's Voice Quality Enhancement solutions are designed to address common audio challenges.
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At Consilient, we are at the forefront of audio innovation, bringing you state-of-the-art acoustic microphone beamforming software that transforms how you capture and experience sound. Our cutting-edge acoustic beamforming products are designed to provide unparalleled clarity and precision.
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Consilient's VoIP Call Decoder is an innovative solution designed to meet the growing demands of Lawful Interception and communication management. This state-of-the-art product is engineered to handle voice, fax, and video data, providing unparalleled capabilities for VoIP decoding.
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The demand for efficient and scalable communication solutions has never been higher in today's digital age. Consilient's SIP SoftModem Server (SSMS) is designed to meet this demand, offering a robust and versatile Cloud SIP-based SoftModem server solution.
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NB-AMR Codec - Narrowband Adaptive Multi-Rate Speech Codec for Mobile & VoIP
The NB-AMR codec, short for Narrowband Adaptive Multi-Rate codec, is a speech codec standardized by 3GPP for encoding narrowband speech at various bitrates. It is widely used in GSM and UMTS networks to provide efficient and intelligible voice communication over bandwidth-limited channels. The codec supports a frequency range up to 3.4 kHz, suitable for traditional telephony voice quality.
Technical Specifications - NB-AMR Codec
| Parameter | Specification |
|---|---|
| Full Name | Narrowband Adaptive Multi-Rate (NB-AMR) Codec |
| Standardized By | 3GPP (ETSI TS 26.071, 26.101) |
| Bandwidth | Narrowband (50 Hz to 3400 Hz) |
| Sampling Rate | 8 kHz |
| Bit Rates Supported | 4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.2, 12.2 kbps |
| Frame Size | 20 ms per frame |
| Codec Delay | Approx. 25 - 35 ms |
| Frame Structure | 16-bit encoded frames with CRC error detection |
| Algorithm | Algebraic Code Excited Linear Prediction (ACELP) |
| Voice Activity Detection | Yes (Includes Discontinuous Transmission support) |
| Error Resilience | Robust against transmission errors and packet loss |
| Complexity | Moderate - suitable for mobile platforms |
Applications Areas of NB-AMR Codec
Mobile & Cellular Communication
- Standard voice codec for GSM and UMTS networks
- Widely used in 2G/3G circuit-switched networks
IP and VoIP Applications
- SIP Clients and VoIP systems
- WebRTC, conferencing software
- Softphone and collaboration tools
Multimedia & Messaging
- MMS support (.amr file format)
- Voice recordings in 3GP, AMR file containers
Consumer & Playback Devices
- Smartphones, feature phones
- Embedded voice applications
- Media playback (support via Android, FFmpeg, etc.)
Performance Summary - LC3/LC3Plus Codec
| Bitrate (kbps) | Speech Quality (MOS-LQO) | Use Case |
|---|---|---|
| 4.75 | ~3.2 | Low-bitrate, poor network conditions |
| 7.95 | ~3.8 | Moderate quality, efficient transmission |
| 12.2 | ~4.2 | Maximum quality (standard telephony voice) |
Supported Platforms
- Operating Systems: Linux, Android, iOS, Embedded RTOS
- Architectures: ARM Cortex-A/R/M, NEON/SIMD, x86/x64, MIPS DSP, Andes DSP, Verisilicon ZSP
Choose the NB-AMR Codec?
High speech quality over mobile and VoIP networks
Bandwidth efficiency and scalable bitrate control
Resilience to network conditions and errors
Mature, proven adoption in GSM/UMTS systems globally
Support for real-time voice and stored multimedia use cases
Low-complexity suitable for constrained hardware
Excellent efficiency and resilience for circuit-switched networks
References & Standards - NB-AMR Codec
- ETSI TS 126.071 -AMR Speech Codec: General Description
- ETSI TS 126.090 - AMR Codec Transcoding functions
- ETSI TS 126.091 - AMR Codec Error concealment of lost frames
- ETSI TS 126.092 -AMR Codec Comfort noise aspects
- ETSI TS 126.093 -AMR Codec Source controlled rate operation
- ETSI TS 126.094 -AMR Codec Voice activity detector
- IETF RFC 4867 -RTP Payload Format for AMR and AMR-WB Codecs
