ITU-T Work Programme

[2013-2016] : [SG12] : [Q3/12]

[Declared patent(s)] - [Publication]

Work item:

P.313

Subject/title:

Transmission characteristics for cordless and mobile digital terminals

Status:

Approved on 2015-06-29 [Issued from previous study period]

Approval process:

AAP

Type of work item:

Recommendation

Version:

Rev.

Equivalent number:

Timing:

Liaison:

SG16, ETSI

Supporting members:

Summary:

ITU-T Recommendation P.313 provides audio performance requirements for portable digital cordless and mobile handsets, headset and speakerphone sets. The requirements apply to narrowband systems (3.1 kHz) regardless of the coding algorithm used in the terminal. Associated test methods are also given. Requirements are specified for the major electro-acoustic performance parameters affecting audio quality, including sending and receiving levels, frequency responses, noise, sidetone, stability, echo path and delay. The requirements given in this Recommendation should ensure satisfactory service quality in a high percentage of installations under normal conditions. Major changes over the previous version of this Recommendation (2007) are as follows: -Specifications for wideband handset, wideband headset and wideband hands-free terminals have been added. -The use of Type 1 and Type 3.2 artificial ears are removed from this Recommendation. -For handset terminals the test of Speech Quality in presence of ambient noise have been added. -For most of the test point is no longer ERP for receive but the diffuse-field. -Requirements for some test such as frequency response, distortion and linearity have been updated.

Comment:

Inclusion of wideband requirement and measurement method for new application.

Reference(s):

[TD 755-GEN (A5 TD)

]

[SG12-TD723/GEN (2015-05)

]

Historic references:

Contact(s):

Junjie Xia, Editor

Gaoxiong Yi, Editor

ITU-T A.5 justification(s):

[ETSI ES 202 396-1 V1.4.1 (2012-10) (awaiting validation)]

[ETSI TS 103 106 V1.2.1 (2013-03) (awaiting validation)]

[Submit new A.5 justification

]
See guidelines for creating & submitting ITU-T A.5 justifications

First registration in the WP: 2012-01-16 15:55:44

Last update: 2015-07-09 16:24:33

Committed to connecting the world

ITU-T work programme

[2013-2016] : [SG12] : [Q3/12]

[Declared patent(s)] - [Publication]