The invention relates to a system for electromagnetic processing of an input wave involving receiving a modified signal derived from two or more signals that represent the input wave when combined; and regulating the modified signal using at least one analog signal containing a characteristic of the...http://www.google.com.au/patents/US7221915?utm_source=gb-gplus-sharePatent US7221915 - Electromagnetic wave transmitter, receiver and transceiver systems, methods and articles of manufacture
