amplitude of a pink noise wave file
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I created a pink noise wavfile using Adobe Audition. the wavfile has length of 50 seconds, two channels (I named them Left - Right) and went through a band pass filter of 50-2000Hz (those are the frequencies allowed to pass).
I want to find the amplitude of that signal and then find the corresponding dB level.
What I did so far:
x = abs(Left); %take the absolute values
Ampl_Abs = mean(x); %that should give mean ampl of the signal
find_dB_level = 20*log10(Ampl_Abs); %that should give me the dB level
I wasn't sure that that was the correct approach, so later I tried FFTing the signal and then retrieve all the info, but that gave me different numbers:
NFFT = 2^nextpow2(length(Left));
x = fft(Left,NFFT)/length(Left);
f = fs/2*linspace(0,1,NFFT/2+1);
title('Single-Sided Amplitude Spectrum of Left')
Is there a way to get all that info from Audition straight out? if yes, how?
Which is the best way to find the mean amplitude and the corresponding dB level?
Thank you in advance!