Looks like some FFT showing noise density vs frequency, but not total noise level inside the hole audio band.
Pretty useless without knowing the number of FFT bins.
Pretty useless without knowing the number of FFT bins.
Not just the number of bins, you need the window noise-equivalent bandwidth and sample frequency... All three are needed to translate between power spectrum and power spectral density plot. Excellent resource here: https://holometer.fnal.gov/GH_FFT.pdf
