Real-time SSVEP measurements through Lock-in detection in FPGA-based platform
In this work, a method for measuring steady-state visually evoked potentials using the Lock-In technique is presented. The proposed method in- volves acquiring the electroencephalography signal through channel averaging from an ADS1299 sigma-delta converter, without the need for additional hardware...
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| Autores principales: | , , , |
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| Formato: | Objeto de conferencia |
| Lenguaje: | Inglés |
| Publicado: |
2023
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/160849 |
| Aporte de: |
| Sumario: | In this work, a method for measuring steady-state visually evoked potentials using the Lock-In technique is presented. The proposed method in- volves acquiring the electroencephalography signal through channel averaging from an ADS1299 sigma-delta converter, without the need for additional hardware to accommodate the signal and processing in real-time using an Intel MAX10 FPGA, while visual stimuli synchronized with the sampling and pro- cessing are generated. The result is a robust platform that allows determining a user's attention focus on visual stimuli flickering at 14.70, 16.67, and 19.23 Hz. The initial experimental tests of the system with three subjects validated the platform, obtaining an average signal-to-noise ratio of 3.2 in the detection, with a maximum of 6.2 in the case of an experienced SSVEP user. |
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