S / N ratio

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The dimensionless signal-to- noise ratio , symbol  D g , is one of the most important electroacoustic properties of a transmission system for acoustic signals. It is the ratio between noise and useful voltage , is determined on a logarithmic scale and given in  dB :



U g = noise voltage (e.g. in volts )
U n = useful voltage (e.g. in volts) as a reference value

The measurement of the noise power is made via a weighting filter , the frequency dependence of the ear sensitivity is adjusted (see curves of equal volume level ) and, depending on the transmission system ( radio or telephone differs).

The voltage of an interference voltage measured in the middle frequency range with a linear weighting filter is called the external voltage ; see also external voltage distance .

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