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ITU-T P.57 (02/2021)

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Status:	Superseded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	here	here	here
7	P.57 (02/2021)	Superseded	here	here	here
6	P.57 (12/2011)	Superseded	here	here	here
5	P.57 (04/2009)	Superseded	here	here	here
4	P.57 (11/2005)	Superseded	here	here	here
3.1	P.57 (2002) Cor. 1 (01/2005)	Superseded	-	-	here
3	P.57 (07/2002)	Superseded	here	here	here
2	P.57 (08/1996)	Superseded	here	here	here
1	P.57 (03/1993)	Superseded	-	here	here


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
P Suppl. 10 (11/1988)	Considerations relating to transmission characteristics for analogue handset telephones	In force	-	here	here
P Suppl. 16 (11/1988)	Guidelines for placement of microphones and loudspeakers in telephone conference rooms and for group audio terminals (GATs)	In force	-	here	here
P Suppl. 20 (03/1993)	Examples of measurements of handset receive-frequency responses: dependence on earcap leakage losses	In force	-	here	here
P Suppl. 23 (02/1998)	ITU-T coded-speech database	In force	here	here	here
P Suppl. 24 (10/2005)	Parameters describing the interaction with spoken dialogue systems	In force	here	here	here
P Suppl. 25 (01/2011)	Parameters describing the interaction with multimodal dialogue systems	In force	here	here	here
P Suppl. 26 (09/2017)	Scenarios for the subjective evaluation of audio and audiovisual multiparty telemeeting quality	In force	here	here	here
P Suppl. 28 (09/2020)	Considerations for the development of new QoS and QoE related objective models to be embedded in Recommendations prepared by ITU-T Study Group 12	In force	here	here	here

Title	Approved on	Download
Addition to Section 2.3 of the Handbook on Telephonometry	2000	here
Addition to Section 3 of the Handbook on Telephonometry	2000	here
Additions to the Handbook on Telephonometry	1999	here
Telephonometry	1992	here

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ITU-T Recommendations

ITU-T P.57 (02/2021)