Psophometer
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In telecommunications, a psophometer is an instrument that provides a visual indication of the audible effects of disturbing voltages of various frequencies.
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.
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This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
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