Perceptual based voice multi-hop transmission over wireless sensor networks

Abstract—Multimedia applications over wireless sensor networks (WSNs) are rapidly gaining interest by the research community in order to develop new and mission critical services such as environmental video monitoring and emergency speech calls. In this work we analyze the possibility of sending voice using a network of wireless tiny motes with the final goal of enhancing speech quality by protecting the most perceptually important packets. We first evaluate the speech quality for a modified version of the ITU-T G.711 standard implemented to fit the particular selected hardware. Hence, we propose a lowcomplexity measure to evaluate the perceptual importance of speech packets. When performing single-hop experimental data collection, we apply packet redundancy (protection) by using a cooperative mote (relay) which retransmits speech packets that are perceptually important to protect them against potential transmission losses. Collected experimental results are then used to assess m...

• Type: Conference
• Year: 2009
• Where: ISCC
• Authors: M. Petracca, G. Litovsky, A. Rinotti, Marco Tacca, J. C. De Martin, Andrea Fumagalli
• Keywords: Communications, Emergency Speech Calls, ISCC 2009, Speech Packets, Speech Quality