EEG signal acquisition front-end circuit with multiple selection reference electrodes

Abstract

The application discloses an EEG signal acquisition front-end circuit with multiple selection reference electrodes. The EEG signal acquisition front-end circuit comprises a first channel reference electrode, a second channel reference electrode, a third channel reference electrode, a fourth channel reference electrode, a common reference electrode, a first channel measurement electrode, a second channel measurement electrode, a third channel measurement electrode and a fourth channel measurement electrode; a programmable control switch connected with the first channel reference electrode, the second channel reference electrode, the third channel reference electrode, the fourth channel reference electrode and the common reference electrode; and a first signal acquisition circuit, a second signal acquisition circuit, a third signal acquisition circuit and a fourth signal acquisition circuit. Obviously, the EEG signal acquisition front-end circuit can achieve that independence of data sampling among all the channels is guaranteed and the data sampling will not be interfered by other channels.

Description

technical field [0001] The present application relates to the technical field of signal acquisition, in particular to an EEG signal acquisition front-end circuit with multiple selection reference electrodes. Background technique [0002] In the existing EEG signal acquisition system, no matter how many channels there are, there is only one common reference electrode. The problem with this is that the common reference electrode can cause crosstalk between channels. For example, if an 8-channel acquisition device shares a reference electrode, it will cause mutual interference between the channels. If only the first channel works, the other channels cannot actually work normally due to poor contact. In fact, other channels may also be affected by the common reference electrode. The corresponding waveform is generated due to the interference of the interference, and the waveform makes it impossible to judge whether it is a waveform generated by real data or a waveform caused by...

AI Technical Summary

Problems solved by technology

The problem with this is that the common reference electrode can cause crosstalk between channels

For example, if an 8-channel acquisition device shares a reference electrode, it will cause mutual interference between the channels. If only the first channel works, the other channels cannot actually work normally due to poor contact. In fact, other channels may also be affected by the common reference electrode. The corresponding waveform is generated due to the interference of the interference, and the waveform makes it impossible to judge whether it is a waveform generated by real data or a waveform caused by crosstalk.

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