Is there a way to show gain has been added to a signal?

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Moasis3141
Moasis3141 2018-1-27
评论： Star Strider 2018-1-28
I have an audio file that produces a 13230080x2 matrix. The first column represents the raw data, the second column represents the same data with 6dB of gain. Am I able to graphically show that gain has been added to that signal?

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Star Strider
Star Strider 2018-1-27
I would take the fft (link) of both, express them both as decibels (using 20*log10(abs(x)) where ‘x’ is each signal) and then plot them together (using the hold function).
You should be able to see the gain.
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Moasis3141
Moasis3141 2018-1-28
%%Representing gain
%Extracting gained and ungained columns
y_ungained = y_air_raw(:,1);
y_gained = y_air_raw(:,2);
%Performing fft on both
fft_gained = fft(y_gained);
fft_ungained = fft(y_ungained);
%Transforming each signal to decibels
deci_gained = 20*log10(abs(fft_gained));
deci_ungained = 20*log10(abs(fft_ungained));
%Plotting each signal
figure(1)
plot(deci_gained)
hold on
plot(deci_ungained)
%Finding the difference
diff = deci_gained - deci_ungained;
figure(2)
plot(diff)
This is what my code looks like currently
Star Strider
Star Strider 2018-1-28
My guess is that your signals are simply very noisy, and the noise is obscuring the details. If you take the mean of your ‘diff’ variable, you will quite likely see the difference, because ‘diff’ does not appear to be symmetric about 0, instead having a positive bias.

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