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ITU-T P.57 (08/1996)

Artificial ears

This Recommendation 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 fourth one (Type 3.4), which is a new addition to this Recommendation, consists in a Simplified (e.g. geometrically describable) Pinna Simulator. Also the requirements for Type 3.2 (Telecom Pinna) are improved, taking into account the experience gained by the manufacturer in the proserial production of the device.Another important improvement introduced in the revision of this Recommendation is the specification of a new calibration methodology and the definition of input impedance requirements for Type 1 Artificial Ear (IEC 318).

Citation:	https://handle.itu.int/11.1002/1000/3636
Series title:	P series: Telephone transmission quality, telephone installations, local line networks P.50-P.59: Objective measuring apparatus
Approval date:	1996-08-30
Approval process:	TAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 12
Further details:	Patent statement(s)

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7	P.57 (02/2021)	Superseded	here	here	here
6	P.57 (12/2011)	Superseded	here	here	here
5	P.57 (04/2009)	Superseded	here	here	here
4	P.57 (11/2005)	Superseded	here	here	here
3.1	P.57 (2002) Cor. 1 (01/2005)	Superseded	-	-	here
3	P.57 (07/2002)	Superseded	here	here	here
2	P.57 (08/1996)	Superseded	here	here	here
1	P.57 (03/1993)	Superseded	-	here	here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