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How does your device overcome the barrier of the mains power frequency being different (50 or 60 Hz) in different regions? Since brain gamma waves are 32-100 Hz
by TheJoeMan 4y ago
How does your device overcome the barrier of the mains power frequency being different (50 or 60 Hz) in different regions? Since brain gamma waves are 32-100 Hz you would need a high attenuation notch filter at the correct frequency.
Although for your sleep application, you may only be working with delta/theta waves.
- pedalpete 4y agoWe do need to filter for 50hz/60hz noise. The EEG front-ends include what's called RLD which is used to cancel common mode noise. But you are also correct we are currently only interested in the lower bands, mostly delta/theta/alpha, potentially beta when looking at wakefulness. We're not currently doing anything in gamma.