Measuring microphone Signal to Noise ratio (SNR) with A-weighting

1. How do you calculate the signal-to-noise ratio SNR?
2. What is the minimum SNR standard for mic intelligibility?
3. Which SNR signal to noise measurement is preferred?

How do you calculate the signal-to-noise ratio SNR?

So, if your SNR measurements are already in decibel form, then you can subtract the noise quantity from the desired signal: SNR = S - N. This is because when you subtract logarithms, it is the equivalent of dividing normal numbers. Also, the difference in the numbers equals the SNR.

What is the minimum SNR standard for mic intelligibility?

True SNR is the actual ratio of signal level to noise level, and this affects all microphones. As mentioned above, an SNR of 74 dB and higher would be considered good.

Which SNR signal to noise measurement is preferred?

ANLs were highest for speech (mean = 7.2 dB), followed by music with lyrics (6.1 dB), and music without lyrics (2.5 dB). Preferred SNRs were highest for music with lyrics (mean = 2.3 dB), followed by speech (1.2 dB), and music without lyrics (-0.1 dB).