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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 3 Apr 2016
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      If you ever need an EKG like right *now*.pic.twitter.com/tAwtLufcF4

      18 replies 661 retweets 851 likes
    2. doragasu‏ @doragasu 3 Apr 2016
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      Replying to @marcan42

      @marcan42 Nice trick! What about EEG? (I'm working right now on non-perforant dry electrodes for EEG)

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 3 Apr 2016
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      Replying to @doragasu

      @doragasu I honestly know nothing about EEG, where should I stick the jack plug? :-)

      1 reply 0 retweets 0 likes
    4. doragasu‏ @doragasu 3 Apr 2016
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      Replying to @marcan42

      @marcan42 You need 2 at the very least. You can put them on a headband. The problem with these hacks is they're dangerous (no isolation).

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 3 Apr 2016
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      Replying to @doragasu

      @doragasu Well you always need 2 (hand is - for the EKG). TBH I think consumer safety stds should be enough to touch a mic in to your head!

      1 reply 0 retweets 0 likes
    6. doragasu‏ @doragasu 3 Apr 2016
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      Replying to @marcan42

      @marcan42 I know, but EEG requires differential measurements, so you need 2 electrodes per channel, plus the reference.

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 3 Apr 2016
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      Replying to @doragasu

      @doragasu why? if you're just measuring the potential difference between two points, you shouldn't need a separate reference.

      1 reply 0 retweets 0 likes
    8. doragasu‏ @doragasu 3 Apr 2016
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      Replying to @marcan42

      @marcan42 Him, for single channel measurements you might be right. But you usually use several channels on EEG, with a single reference.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 3 Apr 2016
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      Replying to @doragasu

      @doragasu Of course, for several channels it makes practical sense to have a separate reference (even for a single channel, to reduce noise)

      9:56 PM - 3 Apr 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Hector Martin‏ @marcan42 3 Apr 2016
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          Replying to @marcan42

          @doragasu This thing actually has a differential input, so I could get a cleaner signal that way (need to break out a TRS jack though)

          2 replies 0 retweets 0 likes
        2. doragasu‏ @doragasu 3 Apr 2016
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          Replying to @marcan42

          @marcan42 Whats the input impedance of that thing? The stratum corneum has a very high impedance. Standard electrodes use gel...

          1 reply 0 retweets 0 likes
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