Question 3/12 - Speech transmission characteristics of speech terminals for fixed circuit-switched, mobile and packet-switched (IP) networks
(Continuation of Question 3/12 and part of Question 2/12)
Motivation
During the previous study period, Q.3/12 produced a new Recommendation (P.300) and the revision of three existing Recommendations (P.310, P.313, and P.350). The weighted terminal coupling loss TCLw for digital handsets in P.310 was increased to meet the G.131 requirement for the control of talker echo and improve quality at all user-controlled earpiece volume settings. P.313 now includes transmission characteristics for mobile hands-free terminals, (in addition to transmission characteristics for mobile and cordless handsets.) The small size of many mobile and cordless terminals can now be taken into account in P.350.
Voice terminals directly interfacing with packet-switched networks (VoIP) have additional considerations, including packet loss and delay. A new recommendation for VoIP terminals has been the focus of Q. 2/12 (P.1010).
The work defined in this Question remains an important area for international telecommunication standardization due to the increase use and design variations of handset, headset, and hands-free terminals for use on mobile and IP networks. Furthermore, speech characteristics for new terminals will fall under this question.
The following major Recommendations, in force at the time of approval of this Question, fall under its responsibility:
P.300, P.310, P.311, P.313, P.341, P.342, P.350, P.370, P.Sup10, P.sup16, G.136.
Question
Study items to be considered include, but are not limited to:
- What enhancement or new Recommendation needs to be developed to defined headset transmission characteristics for mobile and cordless terminals?
- Should there be separate transmission characteristics for cordless and mobile terminals?
- What enhancements to existing Recommendations need to specify the performances of noise reduction and other acoustic enhancement devices within terminals?
- What enhancements to existing Recommendations are needed to specify the performance of mixed operation between Narrow band and Wide band terminals in teleconferencing situations ?
- What transmission characteristics and measurement methods are needed for cordless and mobile terminals using Multi Rate Codecs for narrow band and wide band applications?
- What speech transmission characteristics are needed for multimedia terminals?
- What kind of simple alignment methodology for PC VoIP using different coders is needed?
- What new test methods and signals, such as ones defined in P.501 and P.502, are appropriate for testing transmission characteristics of terminal equipment?
- What speech transmission characteristics are needed for VoIP terminals?
- What are the characteristics and the test methods for terminals implementing Super Wide-Band and full band?
- How can VoIP terminals be tested, considering the assessment methods developed for VoIP gateways under Question 2/12?
- What speech transmission characteristics and measurement methods are needed for terminals using new access techniques (e.g., power line access,
WLAN, etc.)?
- What other changes and/or improvements can be done for the existing Recommendations (P.300, P.310, P.311, P.313, P.340, P.341, P.342, P.350, P.370)?
Tasks
Tasks include, but are not limited to:
- Contribution to the enhancement of ITU-T Recommendation P.1010.
- Contribution to enhancement of ITU-T Recommendation G.172.
- Revision of ITU-T Recommendation P.313 to include speech transmission characteristics for headset terminals.
- Revisions of ITU-T Recommendations of wide band terminals (P.311 and P.341) to update LR requirements.
- Possible revisions of ITU-T Recommendations P.310, P.342 and G.136.
- New recommendation on super wideband and full band terminals.
Relationships
Recommendations: P.330, P.340, P.501, P.502, P.1010, G.131
Questions: 2/12, 5/12, 6/12 and 10/12
Study Groups: SG 15
Standardisation bodies: IEEE, VDA, TIA, 3GPP, ETSI
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