Aperiodic analysis system, as for the electroencephalogram

Surgery – Truss – Pad

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A61B 504

Patent

active

042156971

ABSTRACT:
An aperiodic signal is preliminarily processed by an active network to provide three relatively separate components that include: slow waves (waveform cycles or fragments of equivalent frequency from 1 to 8 hertz), fast waves (waveform cycles or fragments of equivalent frequency from 8 to 30 hertz), and a signal component which may contain spikes (fast, large, sharp single waves). The component signals or waves are applied to individual detector circuits which indicate amplitude and period (or equivalent frequency) information for detected waves and the amplitude for recognized spikes, as well as the time of their occurrence. Detected waves (including spikes) produce representative trigger signals which are applied through a multiplexer to a storage device, specifically a cathode ray tube on which the waves and spikes are representatively displayed and stored to complete a static picture which indicates an internal of the waveform. As disclosed, a representation or picture is generated on the storage tube by controlling the horizontal and vertical amplifiers and appropriately blanking the beam to develop a composite display that summarizes many seconds of the aperiodic signal. The display is a three-dimensional representation with each wave represented by a line that extends in one dimension to indicate amplitude. The position of the line in another dimension indicates the period or equivalent frequency, and its position in the third dimension indicates the time of occurrence of the wave.

REFERENCES:
patent: 3123768 (1964-03-01), Burch et al.
patent: 3186403 (1965-06-01), Bassett
patent: 3774593 (1973-11-01), Hakata et al.

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