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[[File:Psophometer IMG 1665.JPG|thumb|Psophometer]]

In [[telecommunications]], a '''psophometer''' is an instrument that measures the perceptible [[noise (signal processing)|noise]] of a telephone circuit.<ref name="Hickman, EW, 2001" />

The core of the meter is based on a [[true RMS voltmeter]], which measures the level of the noise signal. This was used for the first psophometers, in the 1930s.<ref name="IEEE, Psophometer" /> As the human-perceived level of noise is more important for telephony than their raw voltage, a modern psophometer incorporates a weighting network to represent this perception.<ref name="Hickman, EW, 2001" /><ref name="IEEE, Psophometer" /><ref name="CCITT, P53" /> The characteristics of the weighting network depend on the type of [[telecommunication circuit|circuit]] under investigation, such as whether the circuit is used to normal speech standards (300 Hz – 3.3 kHz), or for [[high-fidelity]] [[broadcast-quality]] sound (50 Hz – 15 kHz).<ref name="Hickman, EW, 2001" />

== Etymology ==
The name was coined in the 1930s, on a basis from {{langx|grc|ψόφος|psóphos|noise}}, itself derived from {{langx|grc|ψό||an exclamation of disgust}}.<ref name="OED, Psophometer" /> It is unrelated to {{langx|grc|σοφός|sóphos|wisdom}}.

The '-meter' suffix {{langx|grc|μέτρον|métron|tool for measuring}} was already widely used in English, but also derives originally from Greek.<ref name="OED, Psophometer" />

==See also==
*[[Psophometric voltage]]

==References==
{{Reflist|refs=

<ref name="Hickman, EW, 2001" >{{Cite magazine
|magazine=[[Electronics World]]
|date=March 2001
|author=Ian Hickman
|title=Balanced circuits
|pages=190–191
}}</ref>

<ref name="CCITT, P53" >{{Cite book
|title=Psophometer for use on telephone-type circuits
|publisher=[[CCITT]]
|id=Rec. P53
|year=1994
|orig-year=1970
|url=https://www.itu.int/rec/T-REC-P.53/en
}}</ref>

<ref name="IEEE, Psophometer" >{{Cite journal
|last1=Harbottle |first1=H.R.
|date=August 1938
|title=The circuit noise-meter (psophometer) and its applications
|journal=[[Journal of the Institution of Electrical Engineers]]
|volume=83 |issue=500 |pages=261–274
|doi=10.1049/jiee-1.1938.0142
}}</ref>

<ref name="OED, Psophometer" >{{Cite web
|title=Psophometer
|website=[[Oxford English Dictionary]]
|url=https://en.oxforddictionaries.com/definition/psophometer
|archive-url=https://web.archive.org/web/20171214071552/https://en.oxforddictionaries.com/definition/psophometer
|url-status=dead
|archive-date=December 14, 2017
}}</ref>

}}
*{{FS1037C}}

{{Electrical and electronic measuring equipment}}

[[Category:Electronic test equipment]]
[[Category:Noise (electronics)]]
[[Category:Measuring instruments]]

Psophometer - Revision history

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