This Recommendation provides audio performance requirements and test methods for digital handset and headset telephones capable of transmitting an audio bandwidth extending beyond the conventional telephony bandwidth of 300 Hz to 3400 Hz, to a bandwidth of approximately 100 Hz to 8000 Hz. Such telephones are known as wideband audio telephones, and will make use of digital encoding schemes such as in [ITU-T G.722]. IP terminals may support other coding algorithms. Wideband audio telephones are expected to be used in new services such as high quality audio conferencing, video conferencing and multimedia applications.
ITU-T P.311-2011 Referenced Document
ITU-T G.1020-2006 Performance parameter definitions for quality of speech and other voiceband applications utilizing IP networks study group 12
ITU-T G.122-1993 Influence of National Systems on Stability and Talker Echo in International Connections Study Group 12
ITU-T G.711-1988 PULSE CODE MODULATION (PCM) OF VOICE FREQUENCIES
ITU-T G.722-1988 7 kHz Audio-Coding within 64 kBit/s - General Aspects of Digital Transmission Systems; Terminal Equipments Study Group XV and XVIII; Covering Note May 30, 2003
ITU-T G.729.1-2006 G.729-based embedded variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729 Study Group 16; Incorporated Amendment 1: 1/13/2007 and Amendment 2: 2/13/2007
ITU-T I.412-1988 ISDN USER-NETWORK INTERFACES INTERFACE STRUCTURES AND ACCESS CAPABILITIES
ITU-T P.50-1999 Artificial Voices Study Group 12; Covering note: 5/25/2000
ITU-T P.51-1996 Artificial Mouth - Series P: Telephone Transmission Quality Objective Measuring Apparatus Study Group 12; 14 pp