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Demodulation system and demodulation algorithm of fsk-ssvep

A demodulation system and algorithm technology, applied in computing, computer components, pattern recognition in signals, etc., can solve the problems of low demodulation accuracy and low usability of collected signals, so as to reduce power consumption and benefit signal Processing, volume reduction effect

Active Publication Date: 2022-01-28
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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  • Demodulation system and demodulation algorithm of fsk-ssvep
  • Demodulation system and demodulation algorithm of fsk-ssvep

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Embodiment

[0070] The electrode replacement method on the subject belt is arranged in accordance with the International 10-20 system. According to the brain function distribution, the EEG signal acquisition device integrates the installation of electrode cap pillow, different LED lamps on the stimulator Different instructions, the subject after receiving the start signal (voice prompt), starts watching a particular stimulus while starting to collect an eElectronic signal. in:

[0071] (1) For different subjects, the best frequency is selected from the SSVEP recognition frequency range (5-20 Hz) as its FSK coding frequency.

[0072] (2) In the selection of the stimulus, not only pay attention to the physiological factors of the test itself, but also considers the effect of multiplier on the experimental results, so the even frequency value is avoided when the stimulation frequency is selected.

[0073] (3) Digital communication with frequency shift keying. First translate the BCI command into...

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Abstract

The invention relates to a demodulation system and a demodulation algorithm of FSK-SSVEP, belonging to the field of brain-computer interface. The system consists of three modules: SSVEP stimulation generator, EEG signal acquisition device and signal processing. After receiving the start signal, the subject stares at a specific stimulus, collects EEG signals at the same time, obtains an instruction signal through a demodulation algorithm, and prompts the subject not to look at the visual stimulator, thereby stopping data collection. The EEG signal acquisition device is used to collect the SSVEP EEG signals generated by the subject through the gaze stimulation device. The collected EEG signals are transmitted wirelessly to the software signal processing platform of the intelligent terminal. After receiving the EEG signals, the software processes them. The platform preprocesses the saved numbers, demodulates the FSK-SSVEP signal and recognizes the instructions, and finally analyzes the effective components in the EEG signals and judges the instructions the subjects are looking at.

Description

Technical field [0001] The present invention belongs to the field of brain, involving the demodulation system and demodulation algorithm of FSK-SSVEP. Background technique [0002] Brain-Computer Interface (BCI), is a communication system between a person and a computer or other electronic device, which allows people to generate the external stimulator without the need for peripheral nerve and muscle activity. Or commands from the human brain to the outside world. In the system, the electromal signals generated by the trial stimulus are translated into computer instructions to manipulate electronic devices, such as computers, robots, etc., are human machine interactions. This technique is mainly used to resume the new neural pathways in some patients who have basically lost motion function. Improve their self-care ability. Brain interface technology is not only in medical rehabilitation, but also is also applied to daily life, military science and entertainment. With the continuo...

Claims

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Application Information

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Patent Type & Authority Patents(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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