2nd Workshop on Wideband Speech Quality - June nd Workshop on Wideband Speech Quality in Terminals and Networks: Assessment and Prediction 22nd and 23rd June 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

2nd Workshop on Wideband Speech Quality - June A new codec within ITU-T: G722.1 Annex C  Extension toward higher frequency of existing transform codec G  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

2nd Workshop on Wideband Speech Quality - June 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

2nd Workshop on Wideband Speech Quality - June 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 ) –Enhanced aacPlus (3GPP TS ) Comparison limited to 24 and 32 kbps, 3gpp audio codecs did operate above 36 kbps in mono.

2nd Workshop on Wideband Speech Quality - June 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)

2nd Workshop on Wideband Speech Quality - June 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)

2nd Workshop on Wideband Speech Quality - June 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)

2nd Workshop on Wideband Speech Quality - June 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)

2nd Workshop on Wideband Speech Quality - June 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

2nd Workshop on Wideband Speech Quality - June 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

2nd Workshop on Wideband Speech Quality - June 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.

2nd Workshop on Wideband Speech Quality - June 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

2nd Workshop on Wideband Speech Quality - June 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

2nd Workshop on Wideband Speech Quality - June 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

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