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Noise at 20 Hz and 40 Hz?
Posted: Sat May 21, 2022 9:07 am
by musicaux
When measuring, 60 Hz of noise is generated in my country. So it also appears on Mind Monitor when 60 Hz is not filtered.
However, once in dozens of times, noise occurs and continues even in 20 Hz and 40 Hz. I googled it, and the term 'subharmonics' seems to be the most similar to this phenomenon, but does subharmonics occur in a normal home environment? Then, the reason why it doesn't appear well on Mind Monitor is because Mind Monitor filters that frequencies?
I wonder if anyone had seen this noise before.
Have a good day!
Re: Noise at 20 Hz and 40 Hz?
Posted: Sat May 21, 2022 11:15 am
by James
Power line noise at 50/60Hz (depending on what you select in settings) is filtered from the calculated brainwaves, but you will always see all noise in the discrete frequency graph as this is unfiltered.
I'm not sure what the 20 & 40Hz noise would be.
Re: Noise at 20 Hz and 40 Hz?
Posted: Thu Jan 05, 2023 1:11 am
by larryz
I have this issue on 30 and 60. Now I am sure 60hz is noise, but not sure about 30 in this picture. How to filter them in the settings ?
Re: Noise at 20 Hz and 40 Hz?
Posted: Thu Jan 05, 2023 3:13 pm
by Keleko84
I also share this noise. It's our link to the collective. I think it means your always broadcasting at that freq.
- Screenshot_20220721-195136~2-01.jpeg (217.89 KiB) Viewed 1900 times
Re: Noise at 20 Hz and 40 Hz?
Posted: Thu Jan 05, 2023 3:15 pm
by Keleko84
Additionally it seems anyone I have attached mind monitor too also shares this freq. It's essentially like your concentrating really hard, but it appears to be passive
Re: Noise at 20 Hz and 40 Hz?
Posted: Thu Jan 05, 2023 3:22 pm
by James
50/60Hz is powerline noise. Move away from power lines / lights etc and it'll go away. Test outside your house has lots of unsheilded power lines
This won't affect your brainwave readings as it's outside of their frequency bands.
I'm not sure about the 32Hz noise @larryz is seeing though.
Re: Noise at 20 Hz and 40 Hz?
Posted: Fri Jan 06, 2023 12:33 am
by larryz
James wrote: ↑Thu Jan 05, 2023 3:22 pm
50/60Hz is powerline noise. Move away from power lines / lights etc and it'll go away. Test outside your house has lots of unsheilded power lines
This won't affect your brainwave readings as it's outside of their frequency bands.
I'm not sure about the 32Hz noise @larryz is seeing though.
The 32Hz is not always there, only obvious when I am in very good meditation status, so I am not sure about it. Will try more on both muse1 and s.
BTW，I want to know the definition of Gamma bands in MindMonitor， 25~100Hz ?
Re: Noise at 20 Hz and 40 Hz?
Posted: Fri Jan 06, 2023 12:58 am
by James
Re: Noise at 20 Hz and 40 Hz?
Posted: Fri Jan 06, 2023 9:55 pm
by larryz
Thanks, James!