| 窄带数字扩音和免提电话终端的传输特性。 |
ITU-T P.342建议书说明数字免提和扩音电话终端的音频性能要求，这些终端使用ITU-T G.711（64千比/秒和56千比/秒均为PCM）和ITU-T G.726（32千比/秒ADPCM）规定的电话频段（300-3 400 Hz）和波形编码。本建议书不涉及使用波形编码以外编码且比特率低于32千比/秒的数字电话的音频性能要求。 |
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| Citation: |
https://handle.itu.int/11.1002/1000/9734 |
| Series title: |
P series: Telephone transmission quality, telephone installations, local line networks
P.300-P.399: Voice terminal characteristics |
| Approval date: |
2009-06-22 |
| Approval process: | AAP |
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Status: |
In force |
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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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