AMDC: de-biasing AMBER visibilities for limiting magnitude sources

The AMBER instrument, the three beams interferometric combiner of the VLTI, occasionally suffers from a fringing artifact, called "correlated noise", likely induced by electromagnetic radio frequencies present in the lab. We analyse how this noise affects the extracted visibilities, becoming more important for fainter sources. This unwanted effect can cause an overestimate of the instrumental V-2 for low flux observations. We have developed a software tool, called "AMBER Detector Cleaner" (AMDC), which successfully removes this artifact and we present here the method on which it is based on some example results. Such software is made available to the community, so that AMBER users can perform optimal data reduction even for faint sources.