A Portable EEG Acquisition System with Real-time Marking Function

Abstract

The invention discloses a portable electroencephalogram collection system with a real-time marking function, and belongs to the field of marking. The portable electroencephalogram collection system comprises an N-channel integration electroencephalogram collection analog front end, a master controller, a communication module, an upper computer and a power module; the N-channel integration electroencephalogram collection analog front end is used for collecting electroencephalograms; the N-channel integration electroencephalogram collection analog front end is connected with the master controller through an SPI bus, and the master controller is connected and communicated with the upper computer through the communication module; the power module supplies power to the N-channel integration electroencephalogram collection analog front end, the master controller and the communication module; a real-time marking system is arranged inside the master controller; the hardware marking mode is adopted; compared with a traditional software marking mode, the marking signal real-time performance can be ensured, and the mark loss rate can be effectively decreased.

Description

technical field [0001] The invention belongs to the field of marking, in particular to a portable EEG acquisition system with real-time marking function. Background technique [0002] In recent years, Brain-Computer Interaction (BCI) technology has become a research hotspot in the field of related technologies in the world and has achieved rapid development. It uses electroencephalogram (Electroencephalogram, EEG) signals to achieve non-action human-computer interaction, which can provide patients with neuromuscular injuries a new type of communication tool that does not rely on normal peripheral nerve and muscle output channels, and can also provide assistance for normal people. Control channels or control channels in special environments have great social value and application prospects. [0003] BCI technology must use EEG signal acquisition equipment, which can amplify the EEG signal of the human body into a signal that can be recognized by the acquisition equipment. T...

AI Technical Summary

Problems solved by technology

Once the time delay is too large or the mark is lost, the host computer will not be able to extract the features

[0004] The traditional marking technology is implemented by inserting the marking signal directly into the data packet on the host computer. The disadvantages are that, first, the marking signal inserted on the software will be affected by data transmission and the cache speed of the host computer and lose its accuracy; Second, a data packet often contains multiple sampling point data, and the marking on the software cannot accurately locate the sampling point when the character flashes

The above two points can cause the loss and misalignment of the marker signal

Although the EEG acquisition devices disclosed in the Chinese patent (EEG acquisition device, publication number: CN103519807B) and the Chinese patent (publication number: CN105326499A) can collect EEG signals, they all use traditional signal conditioning modules such as preamplifiers , analog notch filter, etc. to achieve signal separation and acquisition, this setting is difficult to obtain high-precision EEG signals with a high common-mode rejection ratio, not only their common-mode rejection is relatively low, but the increase in analog devices not only increases the circuit volume and cost, and the noise of the device itself will also affect the quality of the EEG signal; although the EEG acquisition device disclosed in the Chinese patent (a miniature wearable EEG acquisition device, publication number: CN105395193A) can realize High-precision acquisition, marking of P300 signals cannot be realized, so integrated acquisition of P300 signals cannot be completed

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