Transmission Characteristics for Telephone Band (300 - 3400 Hz) Digital Loudspeaking and Hands-Free Telephony Terminals - Series P: Telephone Transmission Quality, Telephone Installations, Local Line Networks Subscribers' Lines and Sets Study Group 12
This ITU-T Recommendation provides audio performance requirements for loudspeaking and handsfree telephony terminals using, in the telephone band (300-3400 Hz), the waveform encoding according to ITU-T Recommendations G.711 [3] (PCM at both 64 kbit/s and