Implement an alternative to SNR function

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Hasan Ghorbani
Hasan Ghorbani il 21 Set 2015
Commentato: Walter Roberson il 24 Set 2015
Folks,
I have x as following:
[x,Fs] = audioread(strcat(PathName,FileName));
And some noise in the form of alpha*v as below:
rng('default');
alpha=0.2;
v = randn(size(x));
I don't have Signal Processing toolbox to use snr() function. How can I find SNR as given in this equation?

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Walter Roberson
Walter Roberson il 22 Set 2015
hint:
sum(x.^2)
  2 Commenti
Hasan Ghorbani
Hasan Ghorbani il 24 Set 2015
Modificato: Hasan Ghorbani il 24 Set 2015
Thansk. Am I right by using following code:
x_snr_db = 20 * log10( sum(x.^2) / sum((alpha * v).^2) );
Walter Roberson
Walter Roberson il 24 Set 2015
Where did the 20 come from?

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