scope:

The present document contains the specification of the Low Complexity Communication Codec plus (LC3plus). The specification includes a full algorithmic description of both the encoder and the decoder. It includes reference fixed-point and floating-point ANSI C source code and conformance test procedures.

The codec has been designed on the one hand for Digital Enhanced Cordless Telecommunications (DECT) and the New Generation DECT (NG-DECT) systems but also for VoIP and other applications such as music streaming.

The LC3plus codec provides the following basic features:

• Capability for speech and audio coding

• Several low delay modes

• Low computational complexity

• Multiple bitrates from 16 kbit/s up to 320 kbit/s and more

• Multiple audio bandwidth from narrow band to full-band and ultra-band

• High- resolution mode for high precision, high dynamic range and audio bandwidth up to the Nyquist frequency also for ultra-band

• Advanced error concealment

• Application Layer Forward Error Correction (AL-FEC) including channel coder functionality

• RTP payload format