What are the iOS libraries for frequency sound processing and by what methods is it performed?

Question

iOS

The idea is to find a library for iOS that can do something like this:
There is an audio track and a graph of the noise reduction coefficient versus the frequency of the sound.

It is necessary to impose a noise isolation effect on this sound track (according to the schedule).
I found two libraries, but I can't figure out which methods/classes contain what I need.
1. bartolsthoorn.github.io/NVDSP
2. audiokit.io/docs/index.html
Guys, please help.