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Presents 2006 IMTC Forum ITU-T Workshop

Presents 2006 IMTC Forum ITU-T Workshop. G.729EV: An 8-32 kbit/s scalable wideband speech and audio coder bitstream interoperable with G.729. Presented by Christophe Beaugeant On behalf of ETRI, France Telecom, Matsushita, Mindspeed, Siemens. G.729EV Standardization history.

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Presents 2006 IMTC Forum ITU-T Workshop

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  1. Presents 2006 IMTC Forum ITU-T Workshop

  2. G.729EV: An 8-32 kbit/s scalable wideband speech and audio coder bitstream interoperable with G.729 Presented by Christophe Beaugeant On behalf of ETRI, France Telecom, Matsushita, Mindspeed, Siemens

  3. G.729EV Standardization history • Standardization work conducted in SG 16, WP 3, Question 10 (Rapporteur: Claude Lamblin) • T0 (approval of Term of References) declared in November 2004 • Qualification test results in July 2005 • ETRI, France Telecom, Matsushita, Mindspeed, Siemens and VoiceAge qualified • These companies collaborated together to provide a single candidate • Optimization phase 08/05-01/06 • Quality assessment tests (02-03/06): G.729EV passed all the requirements. • Current status: under AAP procedure at the ITU-T Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  4. High level overview • 8-32 kbit/s scalable wideband (50-7000 Hz) extension of G.729 • Wideband: More natural voice, better intelligibility, enhance communication comfort • Scalability : flexibility; dynamic, simple and low cost bit rate adaptation • Robustness : packet loss protection and concealment integrated • Build upon a three-stage structure, with 12 embedded layers: • layers 1-2 : CELP, 50-4000 Hz, 8 -12 kbit/s • Layer 3 : TDBWE, 50-7000 Hz, 14 kbit/s • Layers 4-12: TDAC, 50-7000 Hz, 14 to 32 kbit/s 32 8 12 14 TDAC TDAC G.729a+ TDBWE EXT. Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  5. 12 EXT. Original spectrum 8 G.729EV bitrate flexibility G.729a+ • Embedded CELP stage generates layers 1 and 2 : narrowband synthesis (50-4000 Hz) at 8 and 12 kbit/s. • Layer 1 compliant with G.729 bitstream Encoded spectrum 2 3 4 5 6 7 1 Narrow band Wide band Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  6. Original spectrum 12 14 G.729EV bitrate flexibility TDBWE G.729a+ EXT. • Layer 3: Wideband Extension (TDBWE) • Wideband output (50-7000 Hz) at 14 kbit/s Encoded spectrum 2 3 4 5 6 7 1 Narrow band Wide band Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  7. 32 TDAC Original spectrum 12 14 G.729EV bitrate flexibility 24 TDBWE TDAC G.729a+ EXT. • Layers 4 to 12: Predictive transform coding referred as TDAC • Quality improvement from 14 to 32 kbit/s. • Encoding of the weighted CELP coding error in 50-4000 Hz band • Encoding input signal in 4000-7000 Hz band. Encoded spectrum 2 3 4 5 6 7 1 Narrow band Wide band Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  8. FEC encoder embedded 2 H (z) H (z) CELP encoder 1 h1 (8-12 kbit/s) + + - M W (z) LB U X MDCT TDAC encoder (16-32 kbit/s) MDCT TDBWE 2 n (-1) H (z) encoder H (z) h 2 2 (14 kbit/s) Encoder: High level overview Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  9. HPF embedded adaptive 2 G (z) + CELP decoder + 1 postfiltering (8-12 kbit/s) + pre/post-echo reduction D -1 W (z) E LB + + M -1 MDCT + TDAC decoder U -1 MDCT (14-32 kbit/s) X MDCT pre/post-echo reduction TDBWE 2 n (-1) G (z) decoder 2 (14 kbit/s) Decoder: High level overview Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  10. Quality of G.729EV • Listening tests (02-03/06): G.729EV passed all the requirements. • Advanced embedment of three technologies: • CELP : Good performance for Speech • Bandwidth Extension: reduced bit rate to switch to wideband • Transform Coding: high wideband quality with music and non speech signals • Quality equivalent or better than other speech coding standard • Optimum "state of the art" wideband quality for all types of signals (including music) at 32 kbps • High wideband quality of speech maintained at 14 kbps • Narrow band "PSTN quality" at 12 kbps (equivalent to G711) Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  11. Subjective tests Clean speech in Narrowband in French Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  12. Subjective tests Wideband clean speech in French Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  13. Objective Measurement Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  14. Subjective tests Wideband music at 32 kbit/s Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  15. Complexity of G.729EV • Complexity measured using ITU-T Software Tool Library STL2005 v2.1 . • Complexity figures of the G.729EV coder (encoder/decoder). Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  16. Foreseen application • Designed for packetized wideband voice (VoIP, VoATM, IP phone, private networks) • Applications requiring scalable wideband on top of G.729, • Easy integration with existing VoIP infrastructure and services, fast deployment • Extension to Multimedia services (Videoconference, VOD…) • High quality with graceful degradation from WB (face-to-face) quality to NB (telephone) quality • Advantage of Scalability: • Simple and low cost bit rate adaptation (very limited CPU) • Design for devices (gateways) that multiplex data/audio streams • Handling heterogeneous accesses/terminals • Optimization of bitrate to network capabilities (Network congestion) • Easy modification of bitrate by intelligent router (adjustment to network capabilities) • Voice messaging: capacity vs quality trade-off, access adaptation Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  17. Conversational e-Learning Contents IP Backbone WB VoIP & Conversational e-Learning service • Excellent voice quality to fixed users • Fittest quality and service connectivity to mobile users • Trial service will be deployed by KT in Q3/2006 Wireline(xDSL, FTTH, Cable) Service & QoS Manager Fixed User G.729EV 32kbits/s G.729EV 32kbits/s Public Wireless LAN Mobile Users G.729EV 8~32kbits/s For fittest quality WiBro (Portable Internet) Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  18. Enterprise – Branch A (LA) Enterprise – Headquarter (Seoul) IEEE802.11 b/g/e IEEE802.11 b/g/e AAA, Call Agent QoS Manager AP AP G.729 WiFi Phone G.729EV WiFi Phone or G.729EV WiFI + Mobile Flow-based QoS IP Network IEEE802.1 p/q IEEE802.1 p/q G.729EV Soft-phone G.729EV IP phone G.729-G.711 Gateways T1/E1 PSTN Analog phones (Seoul) Enterprise Wideband VoIP • Excellent voice quality among G.729EV terminals • Seamless interoperability of legacy G.729 VoIP users and facilities • Anticipated companies: Dacom, Netcodec, Essetel,Onnet,, Existing VoIP Facilities T1/E1 PSTN Analog phones (LA) Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  19. 24 kbit/s 14 kbit/s 14 kbit/s 32 kbit/s 14 kbit/s 12 kbit/s 12 kbit/s 32 kbit/s Intelligent service • Conference call with heterogeneous terminals • Adaptability to terminal capabilities • Adaptability to Up-link / Downlink voice Quality requirement Service Manager Fixed User AP G.729 EV Wifi phone G729 EV Wifi + Mobile G.729 EV IP phone G.729-G.711 Gateways PSTN Analog Phone Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  20. Conclusion • G729 EV : 8-32 kbit/s scalable codec for narrowband speech (8-12 kbit/s), wideband speech (12-32 kbit/s) and audio (32 kbit/s) • Good quality compared to existing codecs • Applications foreseen used the advantage of scalability • Codecs obtained through collaboration of ETRI, France Telecom, Matsushita, Mindspeed, Siemens and VoiceAge. • Quick development to fit to operators’ needs in the field applications over IP • Extension: Stereo coding, Super Wideband (32 kHz) Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  21. Back-up Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  22. Subjective tests Interfering Talker Background noise at 15 dB in NB in German Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

  23. Subjective tests Interfering talker background noise at 15 dB in WB in English Joint IMTC Forum and ITU-T Workshop – “H.323, SIP: is H.325 next?” – 9-11 May 2006 – San Diego, CA, USA

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