This invention provides a novel technique separating two mixed signals. The method is particularly useful for fetal electrocardiogram estimation. A maternal electrocardiogram signal recorded at the thorax area is nonlinearly mapped onto an electrocardiogram signal recorded at the abdomen using polynomial...http://www.google.de/patents/US7474915?utm_source=gb-gplus-sharePatent US7474915 - Separating mixed signals containing a distorted signal
