How to do an octave or third octave band A weighted sound analysis?

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Hello everyone,
I have been trying to find a way to get an analysis of my signal using A-weighted octave/third octave band.
What I already have is a singal of the sound pressure (Pa) vs time(s) and the sampling frequency.
The outcome should look like one of these examples:
spl_schröck.PNG spl_fkfs.PNG(The 5.6 or 8 kHz are the center frequencies, Terz means 'one third')
I would really appreciate if someone could help me! Unfortunately I have been looking everywhere and didnt find what I'm looking for.

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