In this paper, a packet loss concealment (PLC) algorithm is proposed to improve the quality of decoded speech when packet losses occur in a codeexcited linear prediction (CELP)-type speech coder. The proposed PLC algorithm is based on artificial bandwidth extension (ABE) from narrowband to wideband, consisting of packet loss concealment in the narrow-band, ABE in the modified discrete cosine tr...

In this paper we propose a novel error concealment algorithm for block-based video transmission over errorprone networks. In particular, we develop a spatial error concealment technique which combines edge-preserving interpolation and texture analysis and synthesis, providing a reconstruction of lost macroblocks optimized for visual perception. In particular, the algorithm recovers image edges ...

In this paper we present a voicing controlled, speech parameter based frame loss concealment for frames that have been encoded with the Adaptive Multi-Rate (AMR) speech codec. The missing parameters are estimated by interpolation and extrapolation techniques that are chosen in dependence of the voicing state of the speech frames preceding and following the lost frames. The voicing controlled co...

Error concealment techniques are useful in video transmission over channels that introduce bit errors. The efficiency and result of error concealment technique, however, rely on the error detection capabilities of video decoders. A novel error detection technique employing fragile watermarking is proposed in this paper. By embedding a fragile watermark on the quantized DCT coefficients and exam...

In this paper we present a voicing controlled, speech parameter based frame loss concealment for frames that have been encoded with the Adaptive Multi-Rate (AMR) speech codec. The missing parameters are estimated by interpolation and extrapolation techniques that are chosen in dependence of the voicing state of the speech frames preceding and following the lost frames. The voicing controlled co...

In this paper, we consider the costs and benefits of transactions privacy. In the environment we consider, privacy is the concealment of potentially useful information, but concealment also potentially bestows benefits. In some versions of the environment, the standard Coasian logic applies: given an unambiguous initial assignment of rights and sufficient flexibility in contracting, efficiency ...