I am analyzing spectrum of recorded sound. For that purpose I am using Mathematica's built in functions Spectrogram and Periodogram. I have three questions regarding those:
What is the way to set desired range on frequency axis (y-axis) in Spectrogram's output, so that it "zooms in" to frequencies at specific interval? I managed to accomplish this with Show, but it removes my x axis ticks.
How to change tick positions on frequency axis (so for example that I have them every 200 Hz)?
- Regarding the Periodogram function, what y axis represents (what are the units)?
It seems to me like something in decibels, I looked in MMA's documentation, searched on internet, and I couldn't find answer. Documentation says:
plots the squared magnitude of the discrete Fourier transform (power spectrum) of list
And I understand that the periodogram tells me which frequency is most present. But what are the units?
Thank you for any helpful answers, comments or advices...