How to download the spectrogram data from Muse 2

[Premrique]

I recenetly bought a Muse 2 band and also your app 16€ on Apple store, I have to say the app is really good and user friendly.. I also have quite a lot of questions, although i can't ask all of them. I would like to know how we can download the spectrograhy data after a recording with the app.. Can we download the charts? Thank you James, its an apt avatar!

[James]

You can record the data by pressing the Red dot record button.
Note that you record the data and not the graphs.

If you want to record the graphs, you would need screen recording software; such as Reflector by Air Squirrels, which I can highly recommend.

Once you have recorded the data you can view it online here: https://mind-monitor.com/Chart.php
Or in Excel using the macro here: https://mind-monitor.com/Macro.php

If you want to re-create the spectrogram from data, this is a lot more complicated as it involves doing an FFT on the data. This can be done in MATLAB, but I'm not an expert on that, sorry!

[Premrique]

Well thank you very much for your reply! I've already ploted graphs using Chart and Macro, its a bit difficult to understand the data from the 4 sensors, eg. graphs with only AF7 AF8 has a higher alpha than the ones with TP9 TP10 of the same session data. Also in regards with the Absolute and relative brainwaves, what is the difference between them?

[James]

Absolute waves are individually calculated. Relative waves are affected by the other values.

For example, Relative Alpha goes up if Absolute Alpha goes up, but it also goes up if Beta Absolute goes down.

See here for more info: https://web.archive.org/web/20181115045 ... and_Powers

[BenJabituya]

I've got a different approach to creating the spectrograms which is to essentially export the RAW signal as a WAV file and then just open that up in an audio tool like audacity. Example python script and project folder:

https://github.com/jabituyaben/MuseDataProcessing

Can probably be made more efficient etc but the benefit of doing it this way is you don't have to worry about the FFT stuff or using MATLAB and the GUI tools for handling WAV files and messing with spectrograms allow more flexibility rather than having to code filters or views in each time.

[Goldenerriecher]

It looks like several mind monitor users are interested in downloading spectrograms. Given that the mind monitor app does produce a plot, wouldn't it be possible to save and export that plot as a jpg file? I know that the FFT stuff is complex, but I assume that mind monitor is doing an FFT already, otherwise there would be no spectrograms. If possible I would prefer not to have to buy reflector as an additional app.