Recommendation ITU-T P.342 provides audio performance requirements for digital hands-free and loudspeaking telephony terminals using,in the telephone band (300-3400 Hz),the waveform encoding according to Recommendations ITU-T G.711 (PCM at both 64 kbit/s and 56 kbit/s) and ITU-T G.726 (ADPCM 32 kbit/s).This Recommendation does not deal with audio performance requirements for digital telephones using coding schemes other than waveform encoding and at bit rates lower than 32 kbit/s.
ITU-T P.342-2009 Referenced Document
ITU-T G.122-1993 Influence of National Systems on Stability and Talker Echo in International Connections Study Group 12
ITU-T G.223-1988 Assumptions for the Calculation of Noise on Hypothetical Reference Circuits for Telephony - International Analogue Carrier Systems (Study Group XV) 9 pp
ITU-T G.711-1988 PULSE CODE MODULATION (PCM) OF VOICE FREQUENCIES
ITU-T O.41-1994 Psophometer for Use on Telephone-Type Circuits - Specifications for Measuring Equipment - Equipment for the Measurement of Analogue Parameters (Study Group 4) 17 pp [Superseded: ITU-T P.53]
ITU-T P.310-2003 Transmission characteristics for telephone band (300-3400 Hz) digital telephones SERIES P: TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Subscribers' lines and sets Study Group 12
ITU-T P.340-2000 Transmission Characteristics and Speech Quality Parameters of Hands-Free Terminals Series P: Telephone Transmission Quality Telephone Installations Local Line Networks Subscribers' Lines and Sets Study Group 12; Covering Note: March 31 2004
ITU-T P.501-2000 Test Signals for Use in Telephonometry - Series P: Telephone Transmission Quality@ Local Line Networks Objective Measuring Apparatus
ITU-T P.51-1996 Artificial Mouth - Series P: Telephone Transmission Quality Objective Measuring Apparatus Study Group 12; 14 pp
ITU-T P.58-1996 Head and Torso Simulator for Telephonometry - Series P: Telephone Transmission Quality; Objective Measuring Apparatus Study Group 12
ITU-T P.581-2000 Use of Head and Torso Simulator (HATS) for Hands-Free Terminal Testing Series P: Telephone Transmission Quality, Telephone Installations, Local Line Networks Objective Measuring Apparatus Study Group 12
ITU-T P.64-2007 Determination of sensitivity/frequency characteristics of local telephone systems (Study Group 12)*， 2024-04-19 Update
ITU-T P.79-2007 Calculation of loudness ratings for telephone sets (Study Group 12)*， 2024-04-19 Update
ITU-T P.342-2009 history
2009ITU-T P.342-2009 Transmission characteristics for narrow-band digital loudspeaking and hands-free telephony terminals (Study Group 12)
2000ITU-T P.342-2000 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