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ITU-T P.79 (11/2007)

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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)。
Citation: http://handle.itu.int/11.1002/1000/9276
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
Ed. ITU-T Recommendation Status Summary Table of Contents Download
6 P.79 (11/2007) In force
here
here
here
5.4 P.79 (1999) Cor. 3 (01/2005) Superseded - - here
5.3 P.79 Annex G (11/2001) In force
here
- here
5.2 P.79 (1999) Cor. 2 (02/2001) Superseded - - here
5.1 P.79 (1999) Cor. 1 (10/2000) Superseded - - here
5.0 P.79 (1999) Erratum 1 (05/2000) Superseded - - here
5 P.79 (09/1999) Superseded
here
here
here
4 P.79 (03/1993) Superseded - - here
3 P.79 (11/1988) Superseded - - Not available
2 P.79 (10/1984) Superseded - - Not available
1 P.79 (11/1980) Superseded - - Not available