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ITU-T P.342

2009 Edition, June 1, 2009

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Transmission characteristics for narrow-band digital loudspeaking and hands-free telephony terminals



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Description / Abstract:

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.