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Non-invasive brain-computer interface system and coding method with time-varying coding

A non-invasive, brain-computer interface technology, applied in the input/output process of data processing, input/output of user/computer interaction, mechanical mode conversion, etc. , demodulation difficulties and other problems, to achieve the effect of improving the characteristics of EEG, improving the recognition efficiency, and reducing the difficulty of demodulation

Active Publication Date: 2020-07-10
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The present invention provides a non-invasive brain-computer interface system with time-varying encoding and an encoding method for the technical problems of difficult encoding, demodulation, and difficulty in adapting to the EEG characteristics of different users in the prior art.

Method used

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  • Non-invasive brain-computer interface system and coding method with time-varying coding
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  • Non-invasive brain-computer interface system and coding method with time-varying coding

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Embodiment

[0028] The non-invasive brain-computer interface coding method of variable time length coding is used for the human brain to send a binary code that is easy for the computer to recognize. The human brain generates two first-stage signals with fixed frequency and fixed stimulation time length, and two first-stage signals. The signals correspond to binary codes respectively. Several first-stage signals form a symbol, and the duration of the first-stage signal at the last bit of the symbol is extended to mark the interval between symbols.

[0029]Among them, the human brain generates two first-stage signals with fixed frequency and fixed stimulation time length. The stimulation unit trains the human brain in the following manner. The stimulation unit stimulates the human brain in a binary coded manner. The stimulation unit adopts There is only one identification of the binary code: "Bit 0" and "Bit 1", "Bit 0" and "Bit 1" have corresponding fixed frequency and corresponding fixed ...

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Abstract

The present invention belongs to the field of brain-computer interface, and for the technical problems that the method in the prior art has high coding difficulty, is difficult to demodulate, and is difficult to adapt to the brain-computer characteristics of users, provides a non-intrusive brain-computer interface coding method of variable-length coding. The method is used for that the human brain sends binary codes which are convenient for the computer to identify to the computer; the human brain generates two first phase signals with a fixed frequency and a fixed stimulation time length, the two first phase signals are respectively corresponding to the binary codes, and a plurality of first phase signals form a symbol; and the interval between the symbols is scaled by changing the time length of the first phase signal in the last bit of the symbol or inserting a coded target. The present invention also discloses a non-intrusive brain-computer interface system of variable-length coding.

Description

technical field [0001] The invention relates to the field of brain-computer interface, in particular to a non-invasive brain-computer interface system and a coding method with time-varying coding. Background technique [0002] Studies have shown that when receiving a fixed frequency of visual stimulation, the visual cortex of the human brain will produce a continuous response related to the stimulation frequency (at the fundamental frequency or double frequency of the stimulation frequency). This response is called Steady-State Visual Evoked Potentials, SSVEP. It can be reliably applied to brain-computer interface systems (BCIs). [0003] In order to receive, detect and analyze SSVEP signals, the prior art provides an FM-SSVEP stimulator system, a steady-state visual stimulator system based on fixed frequencies, which refers to the use of several fixed frequencies as stimulation signals , and then collect the EEG signals when the brain receives these stimuli, perform data ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/01
CPCG06F3/015
Inventor 赵德春赵兴王霞王怡
Owner CHONGQING UNIV OF POSTS & TELECOMM
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