Re: [SoX-users] How can I get SNR value of an audio?

[Fmiser <fm...@gm...>]

> xldelg wrote:

> Is there some methods in SoX that I can use to get the SNR
> value of an audio? If not, could you give me some advice to do
> this?

No, not really.

Signal to noise ratio (SNR) is usually used to describe a
device or circuit stage.  The electronics have a self-noise
that is always there.  The electronics also have a maximum
signal level that can be passed undistorted.  The ratio
between the self-noise and the max, expressed in dB, is the
signal to noise ratio.

Since it is effectivaly the ratio of no-signal to max-signal,
it cannot easily be extracted from an existing file with both
signal and noise.  And once the signal has passed through that
device or stage, the noise is now a part of the signal.

Also realize that for any signal except a test tone at the
maximum level, the SNR will change depending on the signal
level any give point in the file.

-- Philip