Wireless input system based on steady-state visual-evoked potentials
First Claim
1. A wireless BCI input system associated with a mobile intelligent device implementing steady-state visual evoked potentials (SSVEP), the system comprising;
- a SSVEP keyboard configured to represent characters and stimulate SSVEP signals such that the mobile intelligent device is controlled by a user via a virtual button; and
an EEG headband configured to acquire EEG signals, extract SSVEP signals, analyze the EEG signals, identify user intention, and communicate with the mobile intelligent device via Bluetooth connection, wherein;
the SSVEP keyboard comprises;
a flash light generator configured to generate flash light,a casing configured to isolate light sources, anda mask configured to representing characters, wherein;
the flash light generator comprising a NE555 chip, resistances, and capacitances,the flash light generator is capable of generating a square wave with a constant frequency to drive light-emitting diode (LED) flashing,LEDs are isolated with opaque plastic materials, the mask is a translucent mask covering on the LEDs, andthe translucent mask forms a drawer-like structure with the SSVEP keyboard and is replaceable;
the EEG headband comprises;
an EEG acquisition module configured to acquire a user scalp EEG signal by amplification, filtration, and AD-conversion,an EEG analysis module configured to extract SSVEP signals and to perform classification,a communication module configured to transfer classification results to the mobile intelligent device, anda headband on which the EEG acquisition module, the EEG analysis module and the communication module are fixed, wherein;
the EEG acquisition module comprises;
three electrodes, andan electric circuitry that comprises a two-stage amplifier with gain of about 1000, a band-pass filter with passband of about 5-40 Hz and an AD-converter with a rate of 512 Hz, two of the three electrodes embedded in the headband and are connected to amplifier input, and the other electrode embedded in an ear clip and connected to ground,the EEG analysis module comprises;
a single-chip computer that runs an analysis program configured to buffer data, remove DC components, eliminate baseline drift, execute time-frequency transformation, extract features, identify none-control state, and perform classification, the communication module comprises;
a Bluetooth module, and
an antenna, wherein the communication module is configured to send characters or control commands to the mobile intelligent device via Bluetooth communication protocols.
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Abstract
A wireless BCI input system for mobile intelligent devices is described. The system may include an SSVEP keyboard for stimulating SSVEP signals and an EEG headband for acquiring EEG signals. The SSVEP keyboard may include sixteen virtual buttons and a mask that can be replaced to change functions of the virtual buttons. The EEG headband may include an EEG acquisition module, an EEG analysis module, and a Bluetooth communication module, which are used for acquiring EEG signals, determining the user'"'"'s input intentions, and sending characters or controlling commands to a matched mobile intelligent device via Bluetooth connection.
8 Citations
4 Claims
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1. A wireless BCI input system associated with a mobile intelligent device implementing steady-state visual evoked potentials (SSVEP), the system comprising;
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a SSVEP keyboard configured to represent characters and stimulate SSVEP signals such that the mobile intelligent device is controlled by a user via a virtual button; and an EEG headband configured to acquire EEG signals, extract SSVEP signals, analyze the EEG signals, identify user intention, and communicate with the mobile intelligent device via Bluetooth connection, wherein; the SSVEP keyboard comprises; a flash light generator configured to generate flash light, a casing configured to isolate light sources, and a mask configured to representing characters, wherein; the flash light generator comprising a NE555 chip, resistances, and capacitances, the flash light generator is capable of generating a square wave with a constant frequency to drive light-emitting diode (LED) flashing, LEDs are isolated with opaque plastic materials, the mask is a translucent mask covering on the LEDs, and the translucent mask forms a drawer-like structure with the SSVEP keyboard and is replaceable; the EEG headband comprises; an EEG acquisition module configured to acquire a user scalp EEG signal by amplification, filtration, and AD-conversion, an EEG analysis module configured to extract SSVEP signals and to perform classification, a communication module configured to transfer classification results to the mobile intelligent device, and a headband on which the EEG acquisition module, the EEG analysis module and the communication module are fixed, wherein; the EEG acquisition module comprises; three electrodes, and an electric circuitry that comprises a two-stage amplifier with gain of about 1000, a band-pass filter with passband of about 5-40 Hz and an AD-converter with a rate of 512 Hz, two of the three electrodes embedded in the headband and are connected to amplifier input, and the other electrode embedded in an ear clip and connected to ground, the EEG analysis module comprises; a single-chip computer that runs an analysis program configured to buffer data, remove DC components, eliminate baseline drift, execute time-frequency transformation, extract features, identify none-control state, and perform classification, the communication module comprises;
a Bluetooth module, and
an antenna, wherein the communication module is configured to send characters or control commands to the mobile intelligent device via Bluetooth communication protocols. - View Dependent Claims (2, 3, 4)
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Specification