How to remove sounds below a certain volume threshold in audacity?

Question

Sound processing

There is a piece of the audio file...

The one on the left is noise. you have to get rid of it. In fact, everything that has such a volume value can be removed.
I tried Noise Removal, but here, what is on the left is what remains after using it.
As I understand it, here you need to remove the sound below a certain Threshold. What means can be used for this?

Answer 1

You are confusing noise reduction and clipping.
Or I misunderstood your question.

Answer 2

This is called either a gate or a pull-down expander.