Transmission characteristics of hands-free telephones |
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This Recommendation updates and replaces Recommendation P.34 (1993). It recommends the transmission and quality characteristics of hands-free and loudspeaking terminals, whatever the type of terminal implementation.However, some paragraphs apply specifically to analogue terminals.The first part of this Recommendation recommends the transmission characteristics of hands-free terminals, as shapes for the response curves, sensitivity values, the test principles and methods, and the switching parameters.The second part recommends the test conditions, in particular the test table, the hands-free terminal positioning according to the type of application, the test room environment, the test signals and a calibration method for the artificial mouth.The third part proposes a set of parameters to qualify the conversation quality given by hands-free terminals. A test method is recommended for each parameter. Finally, the recommended values for some of these parameters are defined, according to a classification, based on the capability to work or not in full duplex. |
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Citation: |
https://handle.itu.int/11.1002/1000/3632 |
Series title: |
P series: Telephone transmission quality, telephone installations, local line networks P.300-P.399: Voice terminal characteristics |
Approval date: |
1996-08-30 |
Approval process: | TAP |
Status: |
Superseded |
Observation: | Formerly Rec. P.34, renumbered P.340 |
Maintenance responsibility: |
ITU-T Study Group 12 |
Further details: |
Patent statement(s)
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ITU-T Supplement
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Title
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Status
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Summary
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Table of contents
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Download
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P Suppl. 10 (11/1988)
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Considerations relating to transmission characteristics for analogue handset telephones
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In force
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-
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here
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here
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P Suppl. 16 (11/1988)
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Guidelines for placement of microphones and loudspeakers in telephone conference rooms and for group audio terminals (GATs)
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In force
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-
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here
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here
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P Suppl. 20 (03/1993)
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Examples of measurements of handset receive-frequency responses: dependence on earcap leakage losses
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In force
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-
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here
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here
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P Suppl. 23 (02/1998)
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ITU-T coded-speech database
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In force
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here
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here
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here
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P Suppl. 24 (10/2005)
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Parameters describing the interaction with spoken dialogue systems
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In force
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here
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here
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here
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P Suppl. 25 (01/2011)
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Parameters describing the interaction with multimodal dialogue systems
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In force
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here
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here
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here
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P Suppl. 26 (09/2017)
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Scenarios for the subjective evaluation of audio and audiovisual multiparty telemeeting quality
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In force
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here
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here
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here
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P Suppl. 28 (09/2020)
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Considerations for the development of new QoS and QoE related objective models to be embedded in Recommendations prepared by ITU-T Study Group 12
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In force
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here
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here
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here
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Title |
Approved on |
Download |
Implementers’ Guide for Recommendation ITU-T P.340
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2008-05-30
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here
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