Old 12-03-2019, 05:34 AM   #1
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Default compression question again (release)

PLease confirm if this is true or not "the compression still works and compresses even when the signal falls below the threshold"

if not...i don't see and can't understand why release would be doing anything to the signal

if yes please further explain so i can understand

thank you
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Old 12-03-2019, 05:48 AM   #2
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Yes, the compression (that is, gain reduction) will still be active when the signal goes below the threshold. The release time determines how quickly the signal below the threshold goes back to its original level.

This image shows what's going on with a 440Hz sine wave that has a sudden increase and decrease in its volume, going through ReaComp :



Just as a tip : It's useful to use sines or other very simple signals as inputs to better see what is happening with various processings.
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Old 12-03-2019, 06:06 AM   #3
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Quote:
Originally Posted by Xenakios View Post
Yes, the compression (that is, gain reduction) will still be active when the signal goes below the threshold. The release time determines how quickly the signal below the threshold goes back to its original level.

This image shows what's going on with a 440Hz sine wave that has a sudden increase and decrease in its volume, going through ReaComp :



Just as a tip : It's useful to use sines or other very simple signals as inputs to better see what is happening with various processings.
thanks Xenakios

whats one reason we would like to keep compressing below the threshold? i.e long release time?

why there's any such thing as compressing below the threshold when we set the compressor to work only above a threshold in the first place
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Old 12-03-2019, 06:19 AM   #4
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Quote:
Originally Posted by read View Post

why there's any such thing as compressing below the threshold when we set the compressor to work only above a threshold in the first place
The compression (gain reduction) can't just be suddenly stopped when the signal goes below the threshold, that would cause a click in the sound. The same is true if you would be doing manual volume automation, very sudden changes in the volume envelope can cause clicks/pops in the sound. Of course these things are not necessarily easily audible with "real life" signals.
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Old 12-03-2019, 06:25 AM   #5
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Quote:
Originally Posted by Xenakios View Post
The compression (gain reduction) can't just be suddenly stopped when the signal goes below the threshold, that would cause a click in the sound. The same is true if you would be doing manual volume automation, very sudden changes in the volume envelope can cause clicks/pops in the sound. Of course these things are not necessarily easily audible with "real life" signals.
so this statement is true?

the compression still pushes the level down (even if its lower than the threshold) until the release stage has been completed.

this will help me understand better
much appreciated Xenakios
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Old 12-03-2019, 06:30 AM   #6
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Quote:
Originally Posted by read View Post
so this statement is true?

the compression still pushes the level down (even if its lower than the threshold) until the release stage has been completed.
When the signal goes below the threshold, the release stage starts ramping the gain back up to the original level. (So it's not a constant gain reduction during the release stage.)
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Old 12-03-2019, 06:41 AM   #7
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right, thank you!
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Old 12-03-2019, 11:36 AM   #8
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Realize also that the actual instantaneous level can go below the threshold hundreds or thousands of times each second. Attack, release, and RMS time help to smooth that out. With all three at 0 you have waveshaping/distortion.
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Old 12-03-2019, 05:18 PM   #9
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Quote:
whats one reason we would like to keep compressing below the threshold? i.e long release time?

why there's any such thing as compressing below the threshold when we set the compressor to work only above a threshold in the first place
Depending on the particular compressor and the sound you want, you can set very-short release times. When working with files (i.e. not in real-time) it's even possible to have "look ahead" and negative attack or release times.


Limiting is a special kind of compression with very-fast attack & release.
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