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Wireless input system based on steady-state visual-evoked potentials

  • US 9,927,872 B2
  • Filed: 10/27/2015
  • Issued: 03/27/2018
  • Est. Priority Date: 07/20/2015
  • Status: Active Grant
First Claim
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1. A wireless brain computer interface (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 represent characters, wherein;

    the flash light generator comprising a NE555 chip, resistances, and capacitances,the flash light generator generates 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 is located below a top window and above a bottom window of the casing of 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 consisting of a frontal electrode that is attached to a forehead of the user, an occipital electrode that is attached to an occipital area of the user, and an ear-clip electrode that is clipped to the left ear lobe of the user, andan electric circuitry that comprises a two-stage amplifier with magnification of 1000 times of the original voltage, a band-pass filter with passband of about 5-40 Hz and an AD-converter with a rate of 512 Hz,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, andan 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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