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Sensors 2011, 11(9), 8469-8484; doi:10.3390/s110908469
Article

Adaptive Redundant Speech Transmission over Wireless Multimedia Sensor Networks Based on Estimation of Perceived Speech Quality

 and *
Received: 3 August 2011; in revised form: 26 August 2011 / Accepted: 30 August 2011 / Published: 31 August 2011
(This article belongs to the Special Issue Selected Papers from FGIT 2010)
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Abstract: An adaptive redundant speech transmission (ARST) approach to improve the perceived speech quality (PSQ) of speech streaming applications over wireless multimedia sensor networks (WMSNs) is proposed in this paper. The proposed approach estimates the PSQ as well as the packet loss rate (PLR) from the received speech data. Subsequently, it decides whether the transmission of redundant speech data (RSD) is required in order to assist a speech decoder to reconstruct lost speech signals for high PLRs. According to the decision, the proposed ARST approach controls the RSD transmission, then it optimizes the bitrate of speech coding to encode the current speech data (CSD) and RSD bitstream in order to maintain the speech quality under packet loss conditions. The effectiveness of the proposed ARST approach is then demonstrated using the adaptive multirate-narrowband (AMR-NB) speech codec and ITU-T Recommendation P.563 as a scalable speech codec and the PSQ estimation, respectively. It is shown from the experiments that a speech streaming application employing the proposed ARST approach significantly improves speech quality under packet loss conditions in WMSNs.
Keywords: wireless multimedia sensor network; speech streaming; packet loss; speech quality estimation; redundant speech transmission; AMR-NB wireless multimedia sensor network; speech streaming; packet loss; speech quality estimation; redundant speech transmission; AMR-NB
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Kang, J.A.; Kim, H.K. Adaptive Redundant Speech Transmission over Wireless Multimedia Sensor Networks Based on Estimation of Perceived Speech Quality. Sensors 2011, 11, 8469-8484.

AMA Style

Kang JA, Kim HK. Adaptive Redundant Speech Transmission over Wireless Multimedia Sensor Networks Based on Estimation of Perceived Speech Quality. Sensors. 2011; 11(9):8469-8484.

Chicago/Turabian Style

Kang, Jin Ah; Kim, Hong Kook. 2011. "Adaptive Redundant Speech Transmission over Wireless Multimedia Sensor Networks Based on Estimation of Perceived Speech Quality." Sensors 11, no. 9: 8469-8484.


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