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ITU-T P.311 (06/2005)

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宽带（150 7 000 Hz）数字手持式话机的传输特性

修订的本建议书提供了宽带音频（7 kHz）手持式话机的音频性能要求，验证宽带音频性能的相应测试方法收录在附件A中。
规定了影响宽带音频的主要音频传输参数的要求和测试方法，包括电平、频率响应、噪声、失真、寄生信号、侧音、回波路径和时延。宽带音频和传统电话技术具有很大的不同，能显著提高质量。
本建议书主要修订部分采纳了宽带响度评定值算法，参见附件G/P.79。

Citation:	https://handle.itu.int/11.1002/1000/7823
Series title:	P series: Telephone transmission quality, telephone installations, local line networks P.300-P.399: Voice terminal characteristics
Approval date:	2005-06-06
Approval process:	AAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 12
Further details:	Patent statement(s) Development history

EditionsRelated Supplement(s)

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
4	P.311 (03/2011)	In force	here	here	here
3	P.311 (06/2005)	Superseded	here	here	here
2	P.311 (02/1998)	Superseded	here	here	here
1	P.311 (04/1995)	Superseded	-	-	here


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
P Suppl. 10 (11/1988)	Considerations relating to transmission characteristics for analogue handset telephones	In force	-	here	here
P Suppl. 16 (11/1988)	Guidelines for placement of microphones and loudspeakers in telephone conference rooms and for group audio terminals (GATs)	In force	-	here	here
P Suppl. 20 (03/1993)	Examples of measurements of handset receive-frequency responses: dependence on earcap leakage losses	In force	-	here	here
P Suppl. 23 (02/1998)	ITU-T coded-speech database	In force	here	here	here
P Suppl. 24 (10/2005)	Parameters describing the interaction with spoken dialogue systems	In force	here	here	here
P Suppl. 25 (01/2011)	Parameters describing the interaction with multimodal dialogue systems	In force	here	here	here
P Suppl. 26 (09/2017)	Scenarios for the subjective evaluation of audio and audiovisual multiparty telemeeting quality	In force	here	here	here
P Suppl. 28 (09/2020)	Considerations for the development of new QoS and QoE related objective models to be embedded in Recommendations prepared by ITU-T Study Group 12	In force	here	here	here
P Suppl. 31 (01/2025)	Subjective quality evaluation of audiovisual communication in videotelephony services	In force	here	here	here