A method and system is shown for encoding data representing knots on an outline defined relative to a coordinate plane and for generating a series of signals representing nodes on the locus of a curve partially defined by said set of knots, involving, selecting sets of coordinates on said outline, to...http://www.google.de/patents/US4686636?utm_source=gb-gplus-sharePatent US4686636 - Method and apparatus for generating a set of signals representing a curve
