Electroencephalogram signal acquisition device and method

Abstract

The invention discloses an electroencephalogram signal acquisition device and method. The electroencephalogram signal acquisition device comprises a connecting electrode, a pre-amplification module, apost-amplification module, a data processing control circuit and an impedance excitation circuit; the connecting electrode transmits an electroencephalogram signal at the position in contact with scalp to the pre-amplification module; the pre-amplification module sends the electroencephalogram signal after primary amplification to the post-amplification module; the post-amplification module performs secondary amplification on the electroencephalogram signal after primary amplification, converts the electroencephalogram signal after secondary amplification into a digital signal, and sends thedigital signal to the data processing control circuit; the data processing control module is used for sending the digital signal or extracting a characteristic value in the digital signal, and sendingthe characteristic value and the digital signal to an external controller; and the data processing control module also receives a control instruction sent by the external controller, and sends a control signal to the impedance excitation circuit according to the control instruction, so that the impedance excitation circuit outputs an impedance detection signal to the connecting electrode according to the control signal.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of biological information, and in particular, to an EEG signal acquisition device and method. Background technique [0002] The EEG signal is a bioelectric signal obtained by conducting the spontaneous bioelectric activity signal of the brain through the arrangement of electrodes and amplified by the EEG acquisition device. Because EEG signals can be collected non-invasively on the scalp, the method is simple and does not damage the human body. It is widely used in brain disease diagnosis, psychological state testing, and brain-computer interface systems. [0003] However, the EEG signal is extremely weak, and it needs to be multiplied by the EEG signal acquisition equipment before it can be accurately acquired. At present, the EEG signal acquisition equipment for scientific research and the medical EEG signal acquisition equipment are large in size and inconvenient to carry, while the...

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Problems solved by technology

[0003] However, the EEG signal is extremely weak, and it needs to be multi-amplified by the EEG signal acquisition equipment to accurately obtain it.

At present, the EEG signal acquisition equipment for scientific research and medical EEG signal acquisition equipment are large and inconvenient to carry, while the portable EEG signal acquisition equipment is small in size, but the circuit performance is reduced, and there is a problem of poor quality of the collected EEG signals. In this way, the EEG signal acquisition equipment cannot take into account both portability and signal quality, which limits the application of EEG signal acquisition equipment in actual scenarios

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