International Conference «Mathematical and Information Technologies, MIT-2016»

28 August – 5 September 2016

Vrnjacka Banja, Serbia – Budva, Montenegro

Stefanovic H.   Milic D.  

Implementing Simulink Low Bitrate Codec Model for VoIP

Reporter: Stefanovic H.

This paper presents a Simulink model for implementing the Internet Low Bitrate Codec (iLBC) for encoding and decoding speech transmission via Voice over Internet Protocol (VoIP). An input Pulse Code Modulated (PCM) speech signal, sampled at 8 kHz with 16-bit samples, is converted into a stream of iLBC packets, which are sent through a simulated lossy channel, causing random packet loss. Different data transmission rates are supported, while the Packet Loss Correction (PLC) is implemented in order to interpolate the speech for missing packet. The communication model is created in Simulink, a graphical programming environment built inside MATLAB. The comparison of original (transmitted) speech signal and detected (received) speech signal is also presented and discussed.

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