P.342-2009

Transmission characteristics for narrow-band digital loudspeaking and hands-free telephony terminals (Study Group 12)


 

 

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标准号
P.342-2009
发布日期
2009年06月01日
实施日期
2010年02月23日
废止日期
中国标准分类号
/
国际标准分类号
/
发布单位
ITU-T - International Telecommunication Union/ITU Telcommunication Sector
引用标准
28
适用范围
This Recommendation provides audio performance requirements for hands-free and loudspeaking telephones using@ in the telephone narrow-band (300-3400 Hz)@ the waveform encoding according to [ITU-T G.711] (PCM at both 64 kbit/s and 56 kbit/s) and [ITU-T G.726] (ADPCM 32 kbit/s). Audio performance requirements for headset terminals are included in [ITU-T P.310]. IP terminals are not included in this Recommendation. Audio performance requirements for digital telephones using coding schemes other than waveform encoding and at bit rates lower than 32 kbit/s are under study.




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