Skip to content
  • Home Home Home, current page.
  • Moments Moments Moments, current page.

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

Tweets

Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

Tweets

  • © 2018 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Kia‏☆‏ @alt_kia Jan 27

      oh and this applies with PWM used to drive LEDs too. No, seeing some meme based on misinterpreted flicker fusion data doesn’t mean you can drive LEDs at absurdly low rates, especially if there’s any relative motion between the LED and the observers

      3 replies 1 retweet 24 likes
      Show this thread
    2. Kia‏☆‏ @alt_kia Jan 27

      for images with high spatial frequencies (the fancy word for "sharp edges", which are present in most images except like, uniform sheets of colour); human vision can distinguish between constant light and time-modulated light up to like, 500ish [sic] Hz:https://www.nature.com/articles/srep07861 …

      2 replies 13 retweets 32 likes
      Show this thread
    3. Kia‏☆‏ @alt_kia Jan 27

      For spatially-uniform visual field, yes, flickering light becomes indistinguishable from constant light at very low framerates, but...that's not what the human vision system is designed for. Images you see -- whether outside or looking at computer or driving -- have lots of edges

      2 replies 4 retweets 26 likes
      Show this thread
    4. James Wu‏ @analogist_net Jan 27
      Replying to @alt_kia @puellavulnerata

      Additionally, saccadic suppression https://www.researchgate.net/publication/258169425_Flicker_can_be_perceived_during_saccades_at_frequencies_in_excess_of_1_kHz … gets you out to >1kHz - that’s why you notice flicker more with quick glances, because our visual system performs “strobe freezes”.

      2 replies 5 retweets 22 likes
    5. James Wu‏ @analogist_net Jan 27
      Replying to @analogist_net @alt_kia @puellavulnerata

      Also detailed in “critical flicker fusion is a seductive but misleading concept” https://www1.essex.ac.uk/psychology/overlays/2014-222.pdf …

      1 reply 0 retweets 4 likes
    6. Ken Martin‏ @kpmartin Jan 27
      Replying to @analogist_net @alt_kia @puellavulnerata

      I notice this all the time on freeways… rear LED running lights that flicker rather than stay on steadily can make a kind of jarring staccato when scanning the roadway. I always wonder who thought that might be a good idea when their whole purpose is visibility during scan.

      1 reply 0 retweets 11 likes
    7. Kia‏☆‏ @alt_kia Jan 27
      Replying to @kpmartin @analogist_net @puellavulnerata

      I'd noticed it too; it's really bad and I legitimately think that flickering lights of that sort are unacceptable on vehicles and manufacturers should be made to put capacitors on those LEDs

      2 replies 0 retweets 10 likes
    8. Rich Felker‏ @RichFelker Jan 29
      Replying to @alt_kia @kpmartin and

      Whhaaaaat?! Are they literally pinching a few pennies leaving out caps in a $20k+ vehicle?

      3 replies 0 retweets 1 like
    9. Rich Felker‏ @RichFelker Jan 29
      Replying to @RichFelker @alt_kia and

      I'm too occupied by their simulating police lights in my mirror (chromatic aberration + discrete spectrum + extreme blue freq = UHG) to notice if those awful things are flashing too...

      1 reply 0 retweets 3 likes
    10. Crissa Kentavr‏ @CrissaKentavr Jan 29
      Replying to @RichFelker @alt_kia and

      Flickering attracts attention so there is no advantage to smoothing anything but headlights.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jan 29
      Replying to @CrissaKentavr @alt_kia and

      No, it's nowhere near that simple. Read the thread.

      10:23 PM - 29 Jan 2018
      • 3 Likes
      • Chris Allen ΧΡ (👻, SC, LP & 🏴) Irenes (many) (high-minded engineer) Andreⓐ
      1 reply 0 retweets 3 likes
        1. New conversation
        2. Crissa Kentavr‏ @CrissaKentavr Jan 29
          Replying to @RichFelker @alt_kia and

          Err, it is. Flicker attracts attention, it doesn’t black out objects at that speed. For most lighting and displays you don’t want to trigger motion sensation, but indicators are fine with that outcome.

          2 replies 0 retweets 0 likes
        3. Kia‏☆‏ @alt_kia Jan 29
          Replying to @CrissaKentavr @RichFelker and

          we’re talking about flickering at PWM frequency (not meant to be visible, is above 60Hz, but nevertheless becomes visible due to phantom array effects / incomplete saccadic masking), not the intended-to-be-visible (~10 Hz) on-and-off blinking. blinking is fine, visible PWM is not

          2 replies 0 retweets 5 likes
        4. Crissa Kentavr‏ @CrissaKentavr Jan 29
          Replying to @alt_kia @RichFelker and

          But it’s irrelevant to some applications; indicators being one of them. So taillights are not something it’s an important factor. Driving is not supposed to be comforting or non-fatiguing. It’s about being safe. Not everyone can or should drive.

          1 reply 0 retweets 0 likes
        5. Dolores  🏴 ✨‏ @AmbrosialArts Jan 29
          Replying to @CrissaKentavr @alt_kia and

          Gotta induce seizures in everyone, that'll improve safety in driving.

          1 reply 0 retweets 5 likes
        6. Crissa Kentavr‏ @CrissaKentavr Jan 29
          Replying to @AmbrosialArts @alt_kia and

          I’d love to see evidence of more than a one in a million chance of that first, pls. Visibility saves far more lives than are being suggested are being affected by this.

          1 reply 0 retweets 0 likes
        7. Dolores  🏴 ✨‏ @AmbrosialArts Jan 29
          Replying to @CrissaKentavr @alt_kia and

          "evidence of more than a one in a million chance" I thought this was unsubstantiated claims to safety hour. You're proposing the flicker attracting attention is better than discomfort induced by it when we live in a world where driver discomfort and fatigue are real factors.

          1 reply 0 retweets 4 likes
        8. Dolores  🏴 ✨‏ @AmbrosialArts Jan 29
          Replying to @AmbrosialArts @CrissaKentavr and

          If attracting attention was always preferable then every car would have sirens on at all times and be covered in constantly blinking lights, but obviously it's not because that also disrupts people who have to experience that in their sensorium, not just drivers but pedestrians.

          2 replies 0 retweets 2 likes
        9. Sam Schinke‏ @sschinke Jan 29
          Replying to @AmbrosialArts @CrissaKentavr and

          Yikes. And every car being the same extreme demand for attention raises the threshold for higher priority signals. Noticing a turn signal or brake light or emergency vehicle will be harder if tail lights are all strobing.

          1 reply 0 retweets 1 like
        10. 3 more replies

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2018 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info