Work item:
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P.57
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Subject/title:
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Artificial ears
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Status:
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Approved on 2021-02-13 [Issued from previous study period]
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Approval process:
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AAP
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Type of work item:
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Recommendation
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Version:
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Rev.
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Equivalent number:
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-
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Timing:
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-
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Liaison:
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3GPP, ETSI
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Supporting members:
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-
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Summary:
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Recommendation ITU-T P.57 specifies the electro-acoustical 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 earphone 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.
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Comment:
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Improvement of the specifications for acoustic frontends, mainly artificial ears, in order to better match an extended frequency range and fit modern earphone devices, aiming to revise Recommendation P.57.
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Reference(s):
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Historic references:
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Contact(s):
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ITU-T A.5 justification(s): |
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First registration in the WP:
2012-07-20 12:22:39
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Last update:
2021-02-17 09:51:33
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