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Psophometer
In telecommunication, a psophometer is an instrument that provides a visual indication of the audible effects of disturbing voltages of various frequencies.
Note: A psophometer usually incorporates a weighting network[?]. The characteristics of the weighting network depend on the type of circuit under investigation, such as whether the circuit is used for high-fidelity[?] music or for normal speech.
Source: from Federal Standard 1037C
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