Calculation of loudness ratings for telephone sets |
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This Recommendation describes the preferred method for calculating loudness ratings mainly in the case of local telephone systems which transmit a band of frequencies not exceeding about 180-4500 Hz.The purpose of using loudness ratings for telephone sets is two-fold: first, to provide the transmission planner with an adequate measure of how the sets perform in the network; second, to enable valid and unambiguous comparison between sets. Therefore, to avoid confusion, this version of this Recommendation contains only those telephone set loudness ratings which are of interest for these purposes.The improvement of the new version of this Recommendation is the addition of Annex G, which gives the W weights to extend the use of the general algorithm in the Recommendation for calculating sending and receiving loudness ratings of wideband (100 to 8000 Hz) terminals. |
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Citation: |
https://handle.itu.int/11.1002/1000/4750 |
Series title: |
P series: Telephone transmission quality, telephone installations, local line networks P.70-P.79: Measurements related to speech loudness |
Approval date: |
1999-09-30 |
Provisional name: | P.XXE |
Approval process: | TAP |
Status: |
Superseded |
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 |
Addition to Section 2.3 of the Handbook on Telephonometry
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2000
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here
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Addition to Section 3 of the Handbook on Telephonometry
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2000
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here
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Additions to the Handbook on Telephonometry
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1999
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here
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Telephonometry
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1992
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here
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