Patent Document ID: 4705049
Application ID: 06892993
Patent Flag: 1

Claim One:
1. An electroencephalograph (EEG) system for the detection of a patient's brain waves, including: a series of electrodes adapted to be connected to a plurality of sectors of the patient's head to produce analog signals representing the patient's brain waves; amplifier means connected to the electrodes, including low-noise high-gain amplifiers to amplify the analog signals; analog/digital conversion means connected to the amplifiers to produce sets of digital data corresponding to the patient's brain waves; a digital filter means connected to said analog/digital conversion means to improve the signal-to-noise ratio of the digital data; digital data analysis means connected to the filter means to analyze the data on a statistical basis to produce analyzed data showing abnormalities and normalities in the brain waves; and display means to display the analyzed data; wherein said digital filter means is a digital comb filter which has self-optimizing means to automatically select the band pass frequencies constituting the teeth of the comb filter based on a comparison, at each tooth, of the phase variance parameter of digital data in the brain state of the presence and the brain state of the absence of a synchronized stimulus producing an evoked potential brain wave.