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    Compressor adds odd order harmonics and limiter issues ?

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    • lalalandsynth
      lalalandsynth last edited by lalalandsynth

      Just stumbled on this , wondering why this is ?
      When engaging the compressor I see these added odd order harmonics.

      Comp Harmonics.gif

      This is when going for faster attack.
      Comp Harmonics Attack.gif

      Decreasing Release time .
      Comp Harmonics Release.gif

      I wonder if its normal ?

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      • lalalandsynth
        lalalandsynth last edited by lalalandsynth

        The limiter has strange behaviour as well.
        Threshold at 0.0dB so no limiting is happening
        Scrolling through the attack has major glitches/zipper noise.
        And for the test signal the signal drops at 0.49 ms attack.
        Limiter.gif

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        • SteveRiggs
          SteveRiggs @lalalandsynth last edited by

          @lalalandsynth

          I also just had a bug report back about the compressor and limiter. They said the sound breaks up if they are on the wrong settings.

          Did you ever find out if there is a certain range that works without these things happening?

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          • Christoph Hart
            Christoph Hart last edited by

            Yeah, changing the limiter's attack time will switch the internal processing at a random value (a few milliseconds) and introduce a big delay, so I'm not really surprised that it works weird.

            Did you drive the sine wave into saturation with the compressor? Because if yes, it should be obvious that it will create harmonics...

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            • lalalandsynth
              lalalandsynth @Christoph Hart last edited by

              @Christoph-Hart said in Compressor adds odd order harmonics and limiter issues ?:

              Yeah, changing the limiter's attack time will switch the internal processing at a random value (a few milliseconds) and introduce a big delay, so I'm not really surprised that it works weird.

              Did you drive the sine wave into saturation with the compressor? Because if yes, it should be obvious that it will create harmonics...

              I think I took care of not doing that, been some time since i did this , will test again .

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              • J
                jariseon @lalalandsynth last edited by

                iiuc mdaLimiter.cpp swaps attack and release param indices, which probably needs to be reflected in MdaEffectWrapper.h

                also, the desmos plots below show mappings from unity range to the synthesis range (equations taken from mdaLimiter.cpp). the release nonlinearity / black curve looks kind of suspicious to me. haven't analyzed the actual dsp algorithm though, so maybe it is just fine.

                https://www.desmos.com/calculator/gkttms7sbn

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