A neural network system and unsupervised learning process for separating unknown source signals from their received mixtures by solving the Independent Components Analysis (ICA) problem. The unsupervised learning procedure solves the general blind signal processing problem by maximizing joint...http://www.google.com/patents/US5706402?utm_source=gb-gplus-sharePatent US5706402 - Blind signal processing system employing information maximization to recover unknown signals through unsupervised minimization of output redundancy 
