Motivation

Multimedia evolution leads to an increase of the audio signal bandwidth in the New Generation Networks. Beside the existing NarrowBand and WideBand, a FullBand is being developped for next years.

This situation brings new challenges in terms of standardization which need to be covered during the next study period.
The extension of the bandwidth also leads to a need of the harmonization of the algorithms aiming to calculate Loudness Ratings for all wide-bands from NarrowBand to Full Band audio signals.

The following Recommendations, in force at the time of approval of this Question, fall under its responsibility:

P.16, P.32, P.48, P.51, P.52, P.53, P.54, P.55, P.57, P.58, P.61, P.64, P.75, P.76, P.78, P.79, P.360, P.380, P.Sup20

Question

Study items to be considered include, but are not limited to:

• What enhancements in the existing Recommendations P.57, P.58, P.51 and P.79 need to be defined in order to accommodate for the evolution in the frequency range of audio transmissions?
• Considerations on how to help measure and mitigate climate change.

Tasks

Tasks include, but are not limited to:

• Development of an algorithm aiming to calculate Loudness Ratings for all wide-bands from NarrowBand to Full Band audio signals aiming to revise Recommendation P.79.
• Improvement of the acoustic frontends, mainly artificial ears, in order to better match this extended frequency range, aiming to revise Recommendation P.57 and P.58.
• Investigation of the directivity of the artificial mouth, aiming to revise Recommendation P.51.
• Development of artificial noise-fields in laboratory conditions. This task could be a joint activity with Question 6/12.
• Clarification of the applicability of ERP/DRP and free field/diffuse field corrections.

An up-to-date status of work under this Question is contained in the SG 12 Work Programme http://www.itu.int/ITU-T/workprog/wp_search.aspx?isn_sp=545&isn_sg=551

Relationships

Recommendations: P.300 series

Questions: 3/12, 4/12 and 6/12

Standardization bodies: IEEE / TIA, ETSI, IEC TC 29, 3GPP