here is the example code I used.

audio = pydub.AudioSegment.from_mp3(f) 
audio = audio.set_channels(1) 
audio_array = np.array(audio.get_array_of_samples())
audio.frame_rate

I read mp3 file with pydub.AudioSegment.

Then I changed channels to 1.

(I forgot the code but when I checked channels, it was 2)

Then I changed it to array.

When I plotted array on matplotlib, I could see pulsation graph between value -20,000 and 20,000.

Here I am curious that what is the unit of these values on y-axis?

Just for reference.

audio.frame_rate value was 48,000.