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ITU-T P.57 (11/2005)

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仿　真　耳

本建议书规定了电话电声测量用的仿真耳的电声特性。规定了三种设备：一种用于测量传统型电话机的电话频带型、一种用于测量耳塞机的类型和一种可以逼真地重现人耳特性的类型。
后一种类型（类型3）规定有四种配置。第三种的要求（类型3.3 – 耳廓模拟器）在ITU-T P.57建议书中有稍许修改，规定了加装一个更柔软的弹性材料。
除此之外，所有耦合器的适用性描述已经改变，现在允许根据测试的听筒的类型，在可用性上有重叠

Citation:	https://handle.itu.int/11.1002/1000/8676
Series title:	P series: Telephone transmission quality, telephone installations, local line networks P.50-P.59: Objective measuring apparatus
Approval date:	2005-11-29
Approval process:	AAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 12
Further details:	Patent statement(s) Development history

EditionsRelated Supplement(s)Related technical papers and reports

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7	P.57 (02/2021)	Superseded	here	here	here
6	P.57 (12/2011)	Superseded	here	here	here
5	P.57 (04/2009)	Superseded	here	here	here
4	P.57 (11/2005)	Superseded	here	here	here
3.1	P.57 (2002) Cor. 1 (01/2005)	Superseded	-	-	here
3	P.57 (07/2002)	Superseded	here	here	here
2	P.57 (08/1996)	Superseded	here	here	here
1	P.57 (03/1993)	Superseded	-	here	here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