Audio encoding based on the empirical mode decomposition

National audienceThis paper deals with a new approach for perceptual audio encoding, based on the Empirical Mode Decomposition (EMD). The audio signal is decomposed adaptively into intrinsic oscillatory components by EMD called Intrinsic Mode Functions (IMFs), which can be fully described by their extrema. These extrema are encoded after an appropriate thresholding scheme controlled by a psycho-acoustic model. The decoder recovers the original signal after IMFs reconstruction by means of spline interpolation and their summation. The proposed approach is applied to different audio signals and results are compared to wavelets and to MPEG1-layer3 (MP3)approaches. Relying on exhaustive simulations, the obtained results show that the proposed compression scheme performs better than the MP3 and the wavelet approach in terms of bit rate and audio quality

Watermark-Aided Pre-Echo Reduction in Low Bit-Rate Audio Coding

International audienc

Watermark-Aided Pre-Echo Reduction in Low Bit-Rate Audio Coding

International audienc

High-frequency tonal components restoration in low-bitrate audio coding using multiple spectral translations

International audienc

Radical surgery decreases overall morbidity and recurrence compared with conservative surgery for liver cystic echinococcosis: systematic review with meta-analysis

Background: This systematic review with meta-analysis aimed to investigate whether radical surgery (RS) for liver cystic echinococcosis (LCE) is superior to conservative surgery (CS) to decrease morbidity, mortality and recurrence. Methods: MEDLINE, Embase, the Cochrane Library, Scopus, INIST, Ovid, Science Direct, Google Scholar, Springer link, clinical key, and web of science were searched up to April 13th, 2018. Adults of either sex operated on for symptomatic but non-complicated LCE were included. The quality of studies was assessed using the Jadad scoring system or the Methodological Index for Non-Randomized Studies index when appropriate. Meta-analyses were performed with a Mantel-Hansel method for random-effects. Results: One randomized controlled trial, one retrospective comparative study using propensity-matching analysis for comparison and 14 retrospective comparative studies were included (3,771 patients). This meta-analysis showed that there were statistically significantly fewer biliary leakage +/- fistula [odds ratio (OR) =0.35; 95% CI, 0.21-0.60, P=0.00001], overall morbidity: (OR =0.49; 95% CI, 0.40-0.59, P=0.00001), and recurrence: (OR =0.17; 95% CI, 0.11-0.26; P<0.00001) in RS compared to CS. Conclusions: This meta-analysis showed that there were statistically significantly fewer biliary leakage +/- fistula, overall morbidity and recurrence in RS compared to CS. In the absence of large-scale RCTs, this meta-analysis suggests that RS is superior to CS in treating hydatid disease of the liver