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alt_kia's profile
Kia‏☆
Kia‏☆
Kia‏☆
@alt_kia

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Kia‏☆

@alt_kia

⁂ dysfunctional Verilog programmer ✦ shockingly nice under the circumstances ✦ patreon: https://www.patreon.com/user?u=12717330  ⁂

Joined April 2013

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    1. whitequark‏ @whitequark Oct 25

      i rewrote my super sketchy MFM demodulator delay-locked loop implementation to use a way more proper phase-locked loop and now it can *very* reliably lock onto the clock from anywhere on the disk without any MFM-specific knowledge other than permitted time between transitionspic.twitter.com/Ka0m3Vbbsz

      2 replies 2 retweets 27 likes
      Show this thread
    2. whitequark‏ @whitequark Oct 25

      i found a specific case where my PLL fails. namely, a zeroed sector is like... 1010101010... with (say) bit time of 30 it locks onto a pattern that it thinks is 100100100... with bit time of 20. tfw the digital logic does exactly what you told it to do and it is INFURIATING.

      3 replies 1 retweet 11 likes
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      Kia‏☆‏ @alt_kia Oct 25
      Replying to @whitequark

      ah so thats why everyone talks about wanting to reduce low freq components with scramblers and other techniques...

      10:09 AM - 25 Oct 2018
      • 4 Likes
      • Peter Barfuss 𒀱 Sera ⚧ whitequark
      1 reply 0 retweets 4 likes
        1. New conversation
        2. Peter Barfuss 𒀱‏ @bofh453 Oct 25
          Replying to @alt_kia @whitequark

          OHH. Okay yeah now that makes sense for me too.

          1 reply 0 retweets 2 likes
        3. Kia‏☆‏ @alt_kia Oct 25
          Replying to @bofh453 @whitequark

          Kia‏☆ Retweeted Kia‏☆

          https://twitter.com/alt_kia/status/1049720746388291584 … yeah if there’s not enough transitions then you have to go open loop

          Kia‏☆ added,

          Kia‏☆ @alt_kia
          love to use an inadequate scrambler which pathologically stresses the receiver's clock-recovery system if certain cursed colours are sent down the link pic.twitter.com/kYmIim0Ldc
          0 replies 1 retweet 3 likes
        4. End of conversation

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