A full-bandwidth EEG signal acquisition device

Abstract

The invention discloses a full-bandwidth brain electrical signal obtaining device. The full-bandwidth brain electrical signal obtaining device is characterized in that an anti-shaking electrode comprises an electrode body, gel and an insulation layer, a direct current attenuator circuit only attenuates direct current and low frequency portions of an input signal, the amplitude of the direct current and low frequency portions is amplified and then is kept within the system A / D collecting amplitude value range, and the overflowing phenomenon does not appear; an amplification filter circuit comprises a secondary amplification circuit and a low pass filter circuit, and an upper computer restores the direct current portion through a digital compensation algorithm and is reconstructed with an alternating current portion to form an original brain electric signal. The full-bandwidth brain electrical signal obtaining device can meet the requirement for standard EDF format storage and has the advantages of being high in precision, full in bandwidth, strong in anti-jamming capacity, complete in data restoration and the like, and the direct current attenuation signal can be automatically reconstructed into the original full-bandwidth brain electrical signal under the conditions that the amplitude value range is from minus 100 mV to plus 100 mV and the precision is 0.3 mu V.

Description

technical field [0001] The invention belongs to the field of biomedical engineering, and relates to a technology for collecting and processing bioelectrical signals, in particular to a device for acquiring full-bandwidth electroencephalogram signals. Background technique [0002] Due to technical limitations and backward cognition in EEG research, the bandwidth of traditional EEG signal acquisition equipment is usually set to 0.5-50Hz, and signals outside this range are considered useless signals or interference signals. With the rapid development of technology and EEG research work, especially for immature brain, epilepsy and other brain states, it is found that low-frequency signals (<0.1Hz) in EEG, even DC components and high-frequency signals are very high. research value. Therefore, it is necessary to have an acquisition device that can acquire DC components to high-frequency components to realize the complete acquisition of EEG signals. [0003] Because the amplit...

AI Technical Summary

Problems solved by technology

This device can avoid the poor contact between the electrode and the scalp during measurement, but its disadvantages are: it cannot effectively reduce the interference of external high-frequency signals on the DC part of the EEG signal, and cannot achieve accurate acquisition of the full-bandwidth EEG signal

It uses implantable electrodes, which have a certain degree of damage to the experimental subjects; at the same time, the method of collecting the DC and AC parts separately cannot realize the real full-bandwidth EEG signal collection.

There are several main problems in the acquisition of full-bandwidth EEG signals, that is, the low-frequency EEG signal has poor anti-interference ability, the DC part of the EEG signal exceeds the acquisition range after being amplified, and the acquired data cannot be saved in the standard EDF format.

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