电话机响度评定值的计算 |
ITU-T P.79建议书描述主要用于市话电话系统的响度评定值优选计算方法(这些系统的发射频率范围不超过180-4500 Hz)。电话机响度评定值的作用有两个:首先,使传输规划人员有完善措施保障电话机在网络中的性能;其次,有助于在电话机之间做出有效和毫无歧义的比较。因此,为避免困惑,本建议书的该版本仅包含用于这些用途的电话机响度评定值。ITU-T P.79建议书的现有版本旨在澄清附件A和附件G的应用领域。本建议书在附件A中对适用于窄带和“双模”窄带/宽带端到端传输(包括终端)的窄带响度评定值做出说明。附件G只适用于宽带终端之间端到端的宽带传输(100 Hz至7 kHz)。 |
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Citation: |
https://handle.itu.int/11.1002/1000/9276 |
Series title: |
P series: Telephone transmission quality, telephone installations, local line networks P.70-P.79: Measurements related to speech loudness |
Approval date: |
2007-11-13 |
Provisional name: | P.XXE |
Approval process: | AAP |
Status: |
In force |
Maintenance responsibility: |
ITU-T Study Group 12 |
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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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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