A Portable EEG Acquisition System

Abstract

The invention discloses a portable electroencephalogram acquisition system. The system comprises a control unit, wherein the control unit comprises an acquisition unit, a filtering device and a protection device; the acquisition unit is connected with the filtering device and the protection device; the acquisition unit comprises at least one synchronous acquisition chip, which is used for acquiring original electroencephalogram signals; the acquisition unit is connected with an electrode, the electrode comprises a plurality of gel electrodes, the gel electrodes are directly pasted onto the to-be-tested areas of a subject, and multichannel electroencephalogram signals can be acquired in different brain areas; the filtering device comprises a set of common-mode filters and a set of differential filters to carry out noise reduction processing on the original electroencephalogram signals acquired by the acquisition unit; and the protection device comprises at least three sets of transientvoltage suppression diodes, which are used for protecting the acquisition unit and preventing the acquisition unit from being electrically broken down. The system is simple in structure, convenient tomove and carry and high in electroencephalogram signal acquisition precision.

Description

technical field [0001] The invention relates to the technical field of signal acquisition, in particular to a portable electroencephalogram acquisition system. Background technique [0002] Electroencephalogram (Electroencephalogram, EEG) is a method of recording brain activity using electrophysiological indicators, which is a necessary basis for the diagnosis of epilepsy. etc. are also very helpful in diagnosis. EEG is still the most objective basis for studying sleep at present. By monitoring brain wave changes during sleep, different periods of sleep can be distinguished. [0003] The EEG collection device is a device that uses brain electrodes in contact with the scalp to collect EEG signals. The EEG signal acquisition method is mainly head-mounted. The experimenter wears a cap connected to multiple electrodes, and obtains EEG signals after long-term contact between the electrodes and the scalp. At present, there are two common EEG acquisition devices as follows. The ...

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Problems solved by technology

At present, there are two common EEG acquisition devices as follows. The traditional EEG signal acquisition device has the characteristics of high precision and stable signal acquisition, but at the same time, it also has the limitations of large size, high price, and inconvenient movement and portability; in recent years Recently, the method of collecting EEG signals using NeuronSky's EEG acquisition module TGAM has been more and more favored by researchers, but the TGAM EEG acquisition module has the disadvantages of low acquisition accuracy and excessive filtering. During the acquisition process, some valuable EEG information will be filtered out

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