1. 2nd Workshop on Wideband Speech Quality - June 2005 1 2nd Workshop on Wideband Speech Quality in Terminals and Networks: Assessment and Prediction 22nd and 23rd June 2005 - Mainz, Germany A new codec within ITU-T: new bandwidth Catherine Quinquis - France Telecom R&D Vice-chair of 3GPP SA4 and co-rapporteur of ITU-T Q7/12 catherine.quinquis@francetelecom.comcatherine.quinquis@francetelecom.com

2. 2nd Workshop on Wideband Speech Quality - June 2005 2 A new codec within ITU-T: G722.1 Annex C  Extension toward higher frequency of existing transform codec G.722.1  Input/output signal bandwidth : [50 Hz;14 kHz]  The foreseen applications for the extension codec are:  Video conferencing  Hands-free teleconferencing  And internet streaming audio  Qualification in November 2004  Only one candidate (that passes the requirements)  Characterisation phase  Approval date : April 2005

3. 2nd Workshop on Wideband Speech Quality - June 2005 3 A new codec within ITU-T: G722.1 Annex C Characterisation methodology  Phase 1 dealing with the main foreseen application: audio conferencing  Clean speech (ACR method) Case of high quality sound recording with minimised room effect  Reverberant speech with background noise (DCR method) Case of typical audio conferencing systems (different room sizes, distances to microphone and types of background noise)  Phase 2 dealing with optional application :audio streaming  Mushra methodology Selected Anchors: 7 kHz and 10 kHz band limited signals  Music Classical, jazz, modern, singer, orchestral  Mixed content items Advertisement, film trailer, news music announcement

4. 2nd Workshop on Wideband Speech Quality - June 2005 4 A new codec within ITU-T: G722.1 Annex C Requirements  Terms of reference  Bit rates : 24 kb/s, 32 kb/s and 48 kb/s  Quality requirements  Clean speech Not worse than MPEG4 AAC-LD for the same bit rate at 99% confidence interval  Reverberant speech with background noise Not worse than MPEG4 AAC-LD for the same bit rate at 99% confidence interval  Characterisation  Comparison at 95 % confidence interval to avoid problems with Type I and type II errors. Type I error: reject a true null hypothesis (5% for 95% CI) Type II error: fail to reject a false null hypothesis The smallest Type I error is, the larger type II errors will be  Add comparison to existing 3GPP audio codecs operating at same bit rate Audio codec for MMS, PSS and MBMS services –Extended AMRWB (3GPP TS 26.304) –Enhanced aacPlus (3GPP TS 26.410) Comparison limited to 24 and 32 kbps, 3gpp audio codecs did operate above 36 kbps in mono.

5. 2nd Workshop on Wideband Speech Quality - June 2005 5 A new codec within ITU-T: G722.1 Annex C Phase 1 Characterisation results (1/4)  Clean Speech  All requirements are met; even better than MPEG4 AAC- LD at low bit rates (24 and 32 kbps)

6. 2nd Workshop on Wideband Speech Quality - June 2005 6 A new codec within ITU-T: G722.1 Annex C Phase 1 Characterisation results (2/4)  Reverberant speech with office noise  Reverberation: Small room (5 people) and microphone at 50 cm  All requirements are met; even better than MPEG4 AAC- LD at low bit rates(24 and 32 kbps)

7. 2nd Workshop on Wideband Speech Quality - June 2005 7 A new codec within ITU-T: G722.1 Annex C Phase 1 Characterisation results (3/4)  Reverberant speech with interfering talker  Reverberation: medium room (25 people) and microphone at 50 cm  All requirements are met; even better than MPEG4 AAC- LD at low bit rates(24 and 32 kbps)

8. 2nd Workshop on Wideband Speech Quality - June 2005 8 A new codec within ITU-T: G722.1 Annex C Phase 1 Characterisation results (4/4)  Reverberant speech with office noise and interfering talker  Reverberation: medium room (25 people) and microphone at 100 cm  All requirements are met; even better than MPEG4 AAC- LD at low bit rates(24 and 32 kbps)

9. 2nd Workshop on Wideband Speech Quality - June 2005 9 A new codec within ITU-T: G722.1 Annex C Phase 2 Characterisation results (1/3)  24 kbps  better than MPEG4 AAC-LD and about the same as 3GPP codecs  G722.1 annex C and MPEG 4AAC-LD and Enhanced aacPlus are more sensitive to content type than extended AMRWB

10. 2nd Workshop on Wideband Speech Quality - June 2005 10 A new codec within ITU-T: G722.1 Annex C Phase 2 Characterisation results (2/3)  32 kbps  better than MPEG4 AAC-LD and about the same as 3GPP codecs  G722.1 annex C and MPEG 4AAC-LD and Enhanced aacPlus are more sensitive to content type than extended AMRWB

11. 2nd Workshop on Wideband Speech Quality - June 2005 11 A new codec within ITU-T: G722.1 Annex C Phase 2 Characterisation results (3/3)  48 kbps  better than MPEG4 AAC-LD  3GPP codecs do not have 48 kbps with mono input signal.

12. 2nd Workshop on Wideband Speech Quality - June 2005 12 A new codec within ITU-T: G722.1 Annex C Extension of P.341  P.341  Need to extend the P.341 recommendation to the super wide band  filter simulating the terminal response has been made available in the STL with ITU-T SG16; this simulation was used for the characterization testing exercise. Frequency (Hz) P341 Extension: upper and lower limits P341 and its Extension

13. 2nd Workshop on Wideband Speech Quality - June 2005 13 A new codec within ITU-T: G722.1 Annex C E model  E model  An extension to wide band (50 Hz- 7 kHz) is been discussed  A new bandwidth (50 Hz – 14 kHz) is going to be used in the network: it should also be taken into account.  Only one codec has been tested in this bandwidth with some adaptation on MNRU range

14. 2nd Workshop on Wideband Speech Quality - June 2005 14 A new codec within ITU-T: G722.1 Annex C MNRU curve  MNRU adaptation  to get more score outside the saturation region, in G722.1 C characterisation test, lowest MNRU is 18 dB

15. 2nd Workshop on Wideband Speech Quality - June 2005 15 A new codec within ITU-T: G722.1 Annex C Thank you