signal to noise ratio (SNR)
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muhammad nur adri nawi
on 14 Jan 2021
Commented: muhammad nur adri nawi
on 15 Jan 2021
How does matlab measure snr of an audio signal?
Why i got negative value of SNR in matlab, Because if i measure using sound level meter in real life the snr of an audio should be high?
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Accepted Answer
Daniel Pollard
on 15 Jan 2021
According to the documentation,
"r = snr(x,y) returns the signal-to-noise ratio (SNR) in decibels of a signal, x, by computing the ratio of its summed squared magnitude to that of the noise, y. y must have the same dimensions as x. Use this form when the input signal is not necessarily sinusoidal and you have an estimate of the noise."
In other words,
r can be negative because it's measured in dB, so if the sum of the squares of the noise y exceeds the sum of the squares of the signal x, the argument of the logarithm is between 0 and 1, so the logarithm is negative.
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