An electroencephelograph (EEG) signal analysis system automatically determines and displays, on a real-time basis, the frequency content of spontaneous EEG signals from the brain. The analog EEG signals from a plurality of channels are sampled and converted to digitized EEG waveforms during a continuing...http://www.google.com/patents/US4579125?utm_source=gb-gplus-sharePatent US4579125 - Real-time EEG spectral analyzer
