EEG Signal Processing with Nithura | ECE243

Computer Organization, Signal Processing, FPGA Development

EEG Signal Processing on the FPGA in C

We implemented a system to display and process EEG signals on VGA using an FPGA. The system could handle an array of 420 data points (typically with a mean of 500) and perform various signal processing operations controlled by switches:

Signal Processing Operations:

• Find Maxima and highlight on VGA
• Find Minima and highlight on VGA
• Display Mean on Hex display
• Find Line of Best Fit and draw on VGA
• Compute FFT and show on VGA (frequency domain)
• Apply Moving Average filter
• Apply Median Filter
• Apply Low Pass Filter on FFT
• Apply High Pass Filter on FFT
• Clear Screen

Control Features:

• Start/End drawing mode
• Mouse input for signal generation (worked in cpulator)
• Key 1 to bypass starting screen
• Input default signal
• Change Signals using Key 4 + Switches [0-6] to load preset values from mindbigdata.com/opendb