A cardiogoniometry or vector cardiography system wherein signals directly derived from the bioelectrical field are not directly processed as orthogonal data but are instead especially orthogonalized in an analog computing network. Orthogonalization is based on a derivation electrode configuration space...http://www.google.de/patents/US4697597?utm_source=gb-gplus-sharePatent US4697597 - Apparatus for cardiogoniometry
