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ITU-T - P.341

(Pre-Published) Transmission characteristics for wideband digital loudspeaking and hands-free telephony terminals

active, Most Current
Organization: ITU-T
Publication Date: 1 March 2011
Status: active
Page Count: 26
scope:

This Recommendation provides audio performance requirements and test methods for loudspeaking and hands-free telephones capable of transmitting an audio bandwidth extending beyond the conventional telephony bandwidth of 300 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, videoconferencing and multimedia applications.

The requirements listed in this Recommendation are primarily applicable to telephones using G.722 encoding at 64 kbit/s, but should also be used as the basis of requirements for other wideband audio encoding schemes. This is still under study in ITU-T Study Group 12.

General information on hands-free terminals, which includes switching characteristics, can be found in [ITU-T P.340] and information on acoustic echo controllers in [ITU-T G.167].

For loudspeaking telephones which do not provide full hands-free operation, the relevant parts of this Recommendation may be used.

Conventional telephone band (300 Hz-3400 Hz) digital hands-free telephones using encoding according to [ITU-T G.711] and [ITU-T G.726] are covered by [ITU-T P.342]. Audio performance requirements for wideband headset terminals are included in [ITU T P.311]. Specifications for car mounted wideband hands-free terminals are included in [ITU-T P.1110]. Transmission characteristics for narrow-band cordless and mobile digital terminals are included in [ITU-T P.313].

Document History

P.341
March 1, 2011
(Pre-Published) Transmission characteristics for wideband digital loudspeaking and hands-free telephony terminals
This Recommendation provides audio performance requirements and test methods for loudspeaking and hands-free telephones capable of transmitting an audio bandwidth extending beyond the conventional...
June 1, 2005
Transmission characteristics for wideband (150-7000 Hz) digital hands-free telephony terminals
A description is not available for this item.
September 1, 1999
Transmission Characteristics for Wideband (150-7000 Hz) Digital Hands-Free Telephony Terminals - Corrigendum 1 - Series P: Telephone Transmission Quality, Telephone Installations, Local Line Networks - Subscribers' Lines and Sets
A description is not available for this item.
February 1, 1998
Transmission Characteristics for Wideband (150-7000 Hz) Digital Hands-Free Telephony Terminals - Series P: Telephone Transmission Quality, Telephone Installations, Local Line Networks - Subscribers' Lines and Sets
A description is not available for this item.
January 1, 1995
Transmission Characteristics of Wideband Handsfree Telephones - Telephone Transmission Quality (Study Group 12) 17 pp
A description is not available for this item.

References

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