An Efficient Voice over Internet Protocol Technique Combining the Speech Data Encryption and G.729 Error Recovery

Abstract

This paper proposes a Voice over Internet Protocol (VoIP) technique combining the speech data encryption and G.729 error recovery. This technique uses the chaotic data interleaving on inter-frames of voice to make the situation of continuous packet loss becoming an isolated packet loss situation. Then, we propose a Periodical Parameter Re-initialization (PPR) recovery approach to reduce the signal quality degradation in the G.729 decoder due to the lost of state synchronization to the G.729 encoder. Besides, the proposed VoIP technique also uses the idea of chaotic data encryption on intra-frames of speech to scramble the data sequence within a speech frame. The simulation results show that using the proposed VoIP technique can have averagely 20 db gain as compared with the original G.729 CODEC with respective to different packet loss rates ranging from 5% to 30%.