Implement an alternative to SNR function

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Hasan Ghorbani el 21 de Sept. de 2015

Comentada: Walter Roberson el 24 de Sept. de 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?

Walter Roberson el 22 de Sept. de 2015

hint:

sum(x.^2)

Hasan Ghorbani el 24 de Sept. de 2015

Editada: Hasan Ghorbani el 24 de Sept. de 2015

Thansk. Am I right by using following code:

x_snr_db = 20 * log10( sum(x.^2) / sum((alpha * v).^2) );

Walter Roberson el 24 de Sept. de 2015

Where did the 20 come from?

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