| Transmission characteristics for cordless and mobile digital terminals |
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ITU-T Recommendation P.313 provides audio performance requirements for portable digital cordless and mobile handsets, headset and speakerphone sets. The requirements apply to narrow-band 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.Changes over the previous version of this Recommendation (2004) are as follows:
• Specifications for headset terminals have been added. These requirements are intended for mobile terminals which use headset.
• Specifications for hands-free terminals are recommended for handheld and desktop speakerphone set, and those for car mounted hands-free terminals will be removed to a separate Recommendation.
• The receiving masks for handset to use Type 3.2, Type 3.3 and Type 3.4 artificial ears are also recommended.Testing methods for handsets have been updated to use test signals defined in ITU-T Recommendations P.50 and P.501 |
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| Citation: |
https://handle.itu.int/11.1002/1000/9064 |
| Series title: |
P series: Telephone transmission quality, telephone installations, local line networks
P.300-P.399: Voice terminal characteristics |
| Approval date: |
2007-03-16 |
| Provisional name: | P.CMT |
| Approval process: | AAP |
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Status: |
Superseded |
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Maintenance responsibility: |
ITU-T Study Group 12 |
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Further details: |
Patent statement(s)
Development history
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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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P Suppl. 31 (01/2025)
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Subjective quality evaluation of audiovisual communication in videotelephony services
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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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