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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 30 Mar 2018
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      Replying to @scanlime @mikelectricstuf and

      I don't think bringing it up at all is the issue; in this case I think you jumped to assuming malicious intent. I agree it's a stupid/insensitive joke, but I think he's poking fun at those who have (unfortunately) co-opted the term "trigger" to mean "think I don't like".

      1 reply 1 retweet 8 likes
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    3. Hector Martin‏ @marcan42 30 Mar 2018
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      Replying to @scanlime @mikelectricstuf and

      You used the words "out of his way" and "deliberate"; that implies intent. Sure, intent does not matter if you look at it from purely the point of view of impact, but it does when you're trying to establish a dialogue about the issue.

      1 reply 0 retweets 6 likes
    4. Hector Martin‏ @marcan42 30 Mar 2018
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      Replying to @marcan42 @scanlime and

      This is what I mean by loop gain. These days a lot of discussions seem to start right off the bat with effectively "Look at how evil this person is". People are immediately boxed as the "other side". This is not conducive to productive dialogue. It just brews more disagreement.

      2 replies 0 retweets 8 likes
    5. Kate Temkin‏ @ktemkin 30 Mar 2018
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      Replying to @marcan42 @scanlime and

      There’s a serious and real problem with this idea, though: When we force people to constrain their tone— to minimize ‘loop gain’— we’re also effectively forcing victims to expend mental energy to massage their arguments into a form that shows no upset. It’s inherently silencing.

      2 replies 0 retweets 7 likes
    6. William D. Jones‏ @cr1901 30 Mar 2018
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      Replying to @ktemkin

      Tfw the tweet youre replying to said runaway _negative_ feedback and I can't overlook it XD. More seriously, well said and I totally agree with you :).

      1 reply 0 retweets 1 like
    7. Hector Martin‏ @marcan42 30 Mar 2018
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      Replying to @cr1901 @ktemkin

      Yes, negative. An underdamped negative feedback control loop turns into an oscillator. The problem I'm referring to is *opposing* sides taking turns to shout louder.pic.twitter.com/5MU5Mgp27n

      1 reply 0 retweets 0 likes
    8. William D. Jones‏ @cr1901 30 Mar 2018
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      Replying to @marcan42 @ktemkin

      Closed loop gain has to be > 1 when phase of feedback is > 180 relative to input for oscillation to occur. Phase > 180 means multiply gain by -1, so negative becomes positive feedback.

      2 replies 0 retweets 0 likes
    9. Hector Martin‏ @marcan42 30 Mar 2018
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      Replying to @cr1901 @ktemkin

      That's a frequency-dependent analysis, yes. Usually the steady-state construction has negative feedback, which then becomes a positive gain of >1 at a given frequency due to loop delay putting the feedback out of phase.

      1 reply 0 retweets 0 likes
    10. William D. Jones‏ @cr1901 30 Mar 2018
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      Replying to @marcan42

      I don't understand what you're talking about unfortunately/how steady state plays into it. I'm thinking mainly in terms of phase margin (a freq-dependent analysis?)

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 30 Mar 2018
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      Replying to @cr1901

      I'm talking about the problem of control system stability. A closed loop control system has negative feedback (take the error signal, invert it, apply it to the input somehow), but that can yield positive gain at certain frequencies because there is loop delay.

      7:08 PM - 30 Mar 2018
      2 replies 0 retweets 0 likes
        1. Hector Martin‏ @marcan42 30 Mar 2018
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          Replying to @marcan42 @cr1901

          If you want a trivial discrete time example: x -= 2.1 * x; is obviously an oscillator with unbounded increasing amplitude even though the feedback is negative.

          0 replies 0 retweets 0 likes
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        2. William D. Jones‏ @cr1901 30 Mar 2018
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          Replying to @marcan42

          My perspective is that the moment the fed back input is more than 180 out of phase with the orig input then you have positive feedback. But that's only "bad" if the fed back gain is > 1. But now I'm doubting myself and will need to bow out. It was me being pedantic anyway :)

          1 reply 0 retweets 0 likes
        3. William D. Jones‏ @cr1901 30 Mar 2018
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          Replying to @cr1901 @marcan42

          You weren't even supposed to see my reply :o! I knew it was unhelpful outside of a joking context.

          1 reply 0 retweets 0 likes
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