AnsweredAssumed Answered

How is hold implemented in peak compressors?

Question asked by J3627 on Apr 10, 2013
Latest reply on May 27, 2014 by J3627

Using the peak compressor, if I turn off the decay time (instant change to unity gain), and then choose specific values of hold in ms, I get big glitches in the output.

 

2013-04-10 14_48_00-Adobe Audition - 15 ms hold timer.wav.png

 

If I choose other values, I don't get the glitches.  For 50 Hz waveform (20 ms wavelength, or 10 ms from peak to peak in abs(signal)):

  • 10 ms no glitches
  • 15 ms glitches
  • 20 ms no glitches
  • 23 ms glitches
  • 25 ms glitches
  • 30 ms no glitches
  • 32 ms glitches
  • 33 ms glitches

 

These glitches aren't as obvious at lower decay values, but they're still visible in the THD residual.

 

I suspect the hold is triggered from a peak, and then after the hold period, it returns to the original gain, regardless of whether any more peaks have occurred during the hold.  Is that true?

 

The way I think it should work is that the hold timer is reset every time there's a peak, so if your decay speed is set to 8686 (instant), but your hold time is longer than half a wavelength of a continuous signal, the hold timer should repeatedly be reset by the peaks of the waveform and the gain should stay constant.

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