A Waveform Analyzer Applied to the Human EEG

This paper presents an approach to signal waveform analysis in the frequency range of 1 to 50 Hz. The technique is applicable to any waveform which is a single-valued function of time with continuous derivatives. The main application of this system has been on the human EEG. The analyzer, to be described, performs its analysis in the time domain and abstracts wave shape information from the original wave and from the successive mathematical derivatives of that wave. The output from this analyzer consists of six analog descriptors of the input EEG wave. These descriptors are basic amplitude and basic frequency of the original input wave, amplitude and frequency of the first derivative of the input wave, and amplitude and frequency of the second derivative of the input wave.