| 车载超宽带和全频段免提通信 |
ITU-T P.1120建议书规定了车载超宽带(50 Hz至14 000 Hz)和/或全频段(20 Hz至20 000 Hz)免提通信的性能要求和测试方法。本建议书涵盖以下用于机动车中供驾驶时进行通信的系统:–内置式免提系统;–售后免提汽车配件;–单麦克风;–通过短程无线连接至免提系统连接的移动电话。本建议书解决完整系统的测试问题,以及带短距无线传输链路(用于免提系统与移动网络的互连)之免提话筒和电话子系统的测试问题。关于测试方面,本建议书描述了测试建立和建议的环境条件。本建议书中描述的方法、分析和性能参数基于ITU-T P.501、ITU-T P.502、ITU-T P.340和ITU-T P.581建议书中定义的测试信号和测试程序。 |
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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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