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FSK-SSVEP demodulation system and demodulation algorithm

A demodulation system and algorithm technology, applied in computing, computer components, pattern recognition in signals, etc., can solve the problems of low availability of collected signals and low demodulation accuracy.

Active Publication Date: 2018-12-18
CHONGQING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

Due to the randomness and non-stationarity of EEG signals, traditional demodulation methods cannot solve the problems of repeated information encountered in the demodulation process and the judgment conditions in the calculation process are too dependent on human subjective experience settings, which leads to the availability of collected signals. Low and the accuracy of demodulation is not high

Method used

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  • FSK-SSVEP demodulation system and demodulation algorithm
  • FSK-SSVEP demodulation system and demodulation algorithm

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Experimental program
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Embodiment

[0070] The electrodes of the electrode cap worn by the subject are arranged according to the international 10-20 system. According to the functional distribution of the brain area, the EEG signal acquisition device is integrated and installed on the occipital lobe of the electrode cap. Different LED lights on the stimulator represent According to different instructions, after receiving the start signal (voice prompt), the subjects began to watch a specific stimulus and began to collect EEG signals at the same time. in:

[0071] (1) For different subjects, select three frequencies with the best effect from the recognizable frequency range (5-20Hz) of SSVEP as their FSK encoding frequencies.

[0072] (2) In the selection of stimulation frequency, we should not only pay attention to the physiological factors of the subject itself, but also consider the influence of frequency doubling on the experimental results, so try to avoid even frequency values ​​when choosing stimulation fr...

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Abstract

The invention an FSK-SSVEP demodulation system and demodulation algorithm, belonging to the field of brain-computer interface. The system consists of three modules: an SSVEP stimulation generator, anEEG signal acquisition device and a signal processing. After receiving the start signal, the subjects gaze at a specific stimulus; the EEG signal is collected and the command signal is obtained through a demodulation algorithm, and the subjects are prompted to stop gazing at the visual stimulator, thus stopping the data acquisition. The EEG signal acquisition device is used for collecting the SSVEP EEG signal generated by the subject through the fixation stimulation device, and the collected EEG signal is wirelessly transmitted to the software signal processing platform of the intelligent terminal. After receiving the EEG signal, the software processing platform performs preprocessing on the stored signal, and FSK-SSVEP signal demodulation and command recognition, and finally analyzes theeffective components of EEG signals and judges the commands that the subjects are watching.

Description

technical field [0001] The invention belongs to the field of brain-computer interface and relates to a demodulation system and a demodulation algorithm of FSK-SSVEP. Background technique [0002] Brain-computer interface (Brain-computer Interface, BCI) is a communication system between a person and a computer or other electronic device, which allows people to transfer stimulation information generated by an external stimulator without the need for peripheral nerve and muscle activity. Or commands are sent directly from the human brain to the outside world. In the system, the EEG signal generated by the subject's gaze stimulation is translated into computer instructions through feature extraction to control electronic equipment, such as computers, robots, etc., which is a human-computer interaction technology. This technology is mainly used to reconstruct or reconstruct new neural pathways for some paralyzed patients who have basically lost their motor functions, so as to re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06F2218/16G06F2218/08
Inventor 赵德春王霞李文瀚王力程闪闪王怡
Owner CHONGQING UNIV OF POSTS & TELECOMM
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