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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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    Hector Martin‏ @marcan42 13 Jul 2020
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    Riddle: what is this waveform, and what does it *sound* like? I knew what the answer was going to be, but it surprised me anyway.pic.twitter.com/024W9LWsqh

    7:37 AM - 13 Jul 2020
    • 12 Retweets
    • 81 Likes
    • Manfred hikari, Kanbaru enthusiast 🌟 other Andrea Emlyn #RejoinEU es Jacob Hurt Reynolds Mrpopo noom ㅤㅤㅤ
    18 replies 12 retweets 81 likes
      1. New conversation
      2. Hector Martin‏ @marcan42 13 Jul 2020
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        Zoom in on one cycle.pic.twitter.com/qBlCFr5jZz

        4 replies 0 retweets 17 likes
        Show this thread
      3. Hector Martin‏ @marcan42 13 Jul 2020
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        Okay, so @jix got it first without spoiling it too much, and @datenwolf said it out loud. The answer is that it sounds exactly the same as a square wave, because it is a square wave, with every frequency component phase shifted by 90 degrees.

        5 replies 5 retweets 35 likes
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      4. Hector Martin‏ @marcan42 13 Jul 2020
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        So take the Hilbert transform, or multiply every component of the (positive/real) FFT by i.

        3 replies 1 retweet 9 likes
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      5. Hector Martin‏ @marcan42 13 Jul 2020
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        That should be @jix_, dammit.

        0 replies 0 retweets 5 likes
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      6. End of conversation
      1. Ian Warmbeer‏ @FishermansEnemy 13 Jul 2020
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        Replying to @marcan42

        That looks like a Tan wave. No idea what it would sound like though.

        0 replies 0 retweets 1 like
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      1. New conversation
      2. Farce Majeure 🌹‏ @vathpela 13 Jul 2020
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        Replying to @marcan42

        At what frequency?

        1 reply 0 retweets 0 likes
      3. Hector Martin‏ @marcan42 13 Jul 2020
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        Replying to @vathpela

        Doesn't really matter, periodic waveforms sound similar no matter the pitch. Pick something like 440Hz if you must.

        1 reply 0 retweets 0 likes
      4. Show replies
      1. New conversation
      2. Jonathan Brodsky‏ @jonbro 13 Jul 2020
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        Replying to @marcan42

        It looks like it would be buzzy and full of high frequency, but I think that's just a visual trick and it sounds the same as a sine wave

        1 reply 0 retweets 5 likes
      3. Hector Martin‏ @marcan42 13 Jul 2020
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        Replying to @jonbro

        I don't think anything but a sine wave can sound like a sine wave, given that it's a pure tone!

        2 replies 0 retweets 6 likes
      4. Show replies
      1. New conversation
      2. Jannis Harder‏ @jix_ 13 Jul 2020
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        Replying to @marcan42

        If you turn it by 90 degree maybe you can fit a square peg into a uh somewhat round and spikey hole

        1 reply 1 retweet 16 likes
      3. Hector Martin‏ @marcan42 13 Jul 2020
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        Replying to @jix_

        You just knew this one didn't you.

        1 reply 0 retweets 5 likes
      4. Show replies

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