(under subclass 340) Subject matter where a signal to be demodulated is compared point to point with an internally generated reference signal which is constructed in such a way that it is at all times a prediction of what the signal to be demodulated should be at that time.
SEE OR SEARCH CLASS
370, Multiplex Communications,
320, 335, 342, 441, 479, and 515 for correlation detection in multiplex environment.
708, Electrical Computers: Arithmetic Processing and Calculating,
300+, for digital filters, per se, subclasses 422+ for digital correlators, subclasses 813+ for analog correlation, and subclass 819 for analog filtering.
