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ITU-T P.57 (02/2021)

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Artificial ears
Recommendation ITU-T P.57 specifies the electro-acoustical characteristics of artificial ears to be used for telephonometric measurements. Four devices are specified: a telephone band type for measurements on traditional telephone sets, an insert earphone type, a type faithfully reproducing the characteristics of the human ear and a type faithfully reproducing the characteristics of the human ear including an average adult human ear canal.
Citation: https://handle.itu.int/11.1002/1000/14599
Series title: P series: Telephone transmission quality, telephone installations, local line networks
  P.50-P.59: Objective measuring apparatus
Approval date: 2021-02-13
Approval process:AAP
Status: Superseded
Maintenance responsibility: ITU-T Study Group 12
Further details: Patent statement(s)
Development history
Ed. ITU-T Recommendation Status Summary Table of Contents Download
8 P.57 (06/2021) In force
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7 P.57 (02/2021) Superseded
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6 P.57 (12/2011) Superseded
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5 P.57 (04/2009) Superseded
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4 P.57 (11/2005) Superseded
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3.1 P.57 (2002) Cor. 1 (01/2005) Superseded - - here
3 P.57 (07/2002) Superseded
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2 P.57 (08/1996) Superseded
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1 P.57 (03/1993) Superseded -
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