Adding two signals at a certain SNR
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I need to add two signals (one is the noise, the other is the speech) at a certain SNR.
How can I do this?
I found on Mathworks but I do not understand it and I am reluctant to using it
noise = noise / norm(noise) * norm(signal) / 10.0^(0.05*snr);
noisy = signal + noise;
Could you please explain it to me?