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ITU-T P.57 (04/2009)

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Artificial ears
Recommendation ITU-T P.57 specifies the electroacoustical characteristics of artificial ears to be used for telephonometric measurements. Three devices are specified: a telephone band type for measurements on traditional telephone sets, an insert type and a type faithfully reproducing the characteristics of the human ear.The latter type (Type 3) is specified in four configurations. The requirements of the third one (Type 3.3 - Pinna simulator) have been slightly modified in this revision of Recommendation ITU-T P.57 by specifying its construction by a softer elastomer.Besides this, the description of the applicability of all couplers has been changed, now allowing for an overlap in their usability according to the receiver type under test.
Citation: http://handle.itu.int/11.1002/1000/9732
Approval date: 2009-04-29
Approval process:AAP
Status: Superseded
Maintenance responsibility: ITU-T Study Group 12
Further details: Patent statement(s)
Development history
[4 related work items in progress]
Ed. ITU-T Recommendation Status Summary Table of Contents Download
6 P.57 (12/2011) In force
here
here
here
5 P.57 (04/2009) Superseded
here
here
here
4 P.57 (11/2005) Superseded
here
here
here
3.1 P.57 (2002) Cor. 1 (01/2005) Superseded - - here
3 P.57 (07/2002) Superseded
here
here
here
2 P.57 (08/1996) Superseded
here
here
here
1 P.57 (03/1993) Superseded -
here
here