how to determine SNR of an audio signal in MATLAB ?

how to determine SNR of an audio signal in MATLAB ?

Answer 1

[Rahul]

Hi @Noor Aliff,

In order to measure the 'Signal to Noise ratio' (SNR) of an audio signal, consider using the 'snr' function directly. The following MATLAB Answer expains this approach:

https://www.mathworks.com/matlabcentral/answers/1999653-how-to-measure-snr-signal-to-noise-ratio-of-a-audio-signal

As SNR is defined as the power ratio between a signal and the background noise, hence SNR can also be computed by comparing the power values of the signal and the noise as mentioned in the following MATLAB Answer:

https://www.mathworks.com/matlabcentral/answers/717213-signal-to-noise-ratio-snr

Here is an example:

[signal, fs] = audioread('audio_signal.wav');
[noise, fs_noise] = audioread('noise_signal.wav');

% Calculate the power of the signal
signalPower = sum(signal.^2) / length(signal);
noisePower = sum(noise.^2) / length(noise);

% Calculate SNR in dB
SNR = 10 * log10(signalPower / noisePower);

The following MathWorks documentations can be referred to know more:

'snr': https://www.mathworks.com/help/releases/R2021b/signal/ref/snr.html

Thanks.