Requirements on Wideband Bluetooth Connection from FG Carcom Point of View

INTERNATIONAL TELECOMMUNICATION UNION FOCUS GROUP ON "FROM/IN/TO CARS COMMUNICATION II" TELECOMMUNICATION FG CarCom-OL-1 STANDARDIZATION SECTOR STUDY PERIOD 2005-2008 English only Original: English Lannion, 8-9 September 2008 OUTGOING LIAISON STATEMENT Source: ITU-T FG-CarCom (Lannion, 8-9 September 2008) Title: Requirements on Wideband Bluetooth Connection from FG CarCom Point of View

To: Bluetooth SIG, Car Working Group, Patric Lind (patric.lind@ sonyericsson.com) ITU-T SG 12 Q.7/12, ITU-T SG 16 3GPP SA4 3GPP2 TSGC SWG1.1, Chandrasekhar Sundarrama ([email protected]) Approval: Agreed to at FG CarCom meeting For: Information & Action Deadline: 18 December 2008 Contact: H.W. Gierlich Tel: +49 2407 57722 HEAD acoustics Fax: +49 2407 57799 Germany Email: [email protected] Contact: F. Goebel Tel: +49 160 8639088 Daimler AG Fax: Germany Email: [email protected] Please don’t change the structure of this table, just insert the necessary information.

ITU-T Focus Group “From/In/To Cars Communication II (FG CarCom)" is currently developing requirements and test specifications for wideband (50Hz - 7kHz) speech communication systems integrated and/or used in motor vehicles. This includes speakerphone hands-free systems as well as headphone hands-free systems. Within this task the Bluetooth connection between mobile phones and speakerphone/headset is of essential importance. We believe that only high quality wideband systems will be accepted and successful in the market since only with high quality systems the user will really benefit from wideband transmission. In order to achieve this goal the Bluetooth link is of major importance. From our point of view the Bluetooth connection needs to provide - low delay (<10ms) transmission - high audio quality Attention: This is a document submitted to the work of ITU-T and is intended for use by the participants to the activities of ITU-T's Focus Group on From/in/to cars communication II, and their respective staff and collaborators in their ITU-related work. It is made publicly available for information purposes but shall not be redistributed without the prior written consent of ITU. Copyright on this document is owned by the author, unless otherwise mentioned. This document is not an ITU-T Recommendation, an ITU publication, or part thereof. - 2 - FG CarCom-OL-1

- preferably no additional codec should be introduced (tandem-free operation) - if an additional codec is introduced this should provide o high quality in tandem operation with other wideband codecs (AMR-WB, G.722…) o high quality if exposed to all types of background noise o high quality packet loss concealment (without introducing additional delay) o no other signal processing except speech coding

In order to investigate and prove the performance of any codec chosen it is unavoidable to conduct appropriate subjective testing since currently there is no objective method capable to provide valid objective scores under all the conditions listed above. From our point of view ITU-T G. 722 would be a good choice since - it has been the reference codec in all AMR-WB investigations - it has been thoroughly tested subjectively in different tandem combinations, background noise conditions and with different languages (see e.g. 3GPP TR 26 976) - it is of low complexity - it is royalty free - is works on sample basis and therefore introduces low delay - it is chosen as the wideband codec in most VoIP connections and in NG-DECT (CAT-IQ) terminals - a PLC is available.

FG CarCom would be happy to support you in all questions concerning speech quality requirements for the new wideband Bluetooth connection to be specified. Further information about the tests and requirements from FG CarCom point of view can be found in ITU-T Rec. P.1100. We would appreciate you feedback on your further developments and decisions. ______