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Enhanced Voice Services (EVS) Codec for ARC Processors
The Enhanced Voice Services (EVS) codec for DesignWare® ARC® Processors is a super-wideband speech audio coding standard. The original specification was developed by 3GPP and described in 3GPP TS 26.441. EVS is the mandatory audio codec for super-wideband transmissions via VoLTE. This codec offers up to 20 kHz audio bandwidth, with high robustness to delay jitter and packet losses due to its channel aware coding and improved packet loss concealment. The application areas for this codec cover improved telephony and teleconferencing, audio-visual conferencing services, and cellular streaming audio.
Features
- 32 ms of total algorithmic delay
- Supports voice/audio
- {8, 16, 32, 48} kHz sample rates
- Bitrates from 5.9 kbit/s up to 128 kbit/s
- Enhanced interoperation with AMR-WB
- Supports voice activity detection (VAD), discontinuous transmission (DTX), comfort noise generation (CNG) and jitter buffer management (JBM)
- High robustness to packet loss
Benefits
- Enhanced inter-operation with AMR-WB
- Supports – Voice activity detection (VAD – Discontinuous transmission (DTX) – Comfort noise generation (CNG) – Jitter buffer management (JBM) High robustness to packet loss
- Supported ARC Cores: EM5D, EM7D, EM9D, EM11D, EM45D, HS47D
Deliverables
- Software Library - The software library for the ARC EVS codec includes:
- Optimized source code
- Associated make-files for building the EVS codec
- Usage example of the EVS codec
- Documentation The following documentation is available for the ARC EVS codec:
- Release Notes
- Getting Started
- Reference Guide
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