A signal is sampled and the samples are divided into windows. One of at least three values is associated with a respective window based on whether the samples in the window are relatively constant, incremental or decremental, to thereby generate an approximation vector. Locations of thresholds in the...http://www.google.de/patents/US7583819?utm_source=gb-gplus-sharePatent US7583819 - Digital signal processing methods, systems and computer program products that identify threshold positions and values
