NoTube: Loudness Normalisation
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  • 1. WP 4Loudness Normalisation Peter Altendorf, IRT
  • 2. Technical Achievements• Provision of a Loudness Normalisation web service compliant with ITU and EBU for UC7a• Provision of Loudness Analysis results to support ads insertion in UC7b• Evaluation of Loudness Normalisation on the web 26-27 March 2012 NoTube 3rd review 2
  • 3. Loudness Normalisation Process Chain as Web Service Metadata Web service for implementation conversion of loudness normalisationPrestoSpace Webservice WP2 TVA Extract Demux Decompr. Synthesis Synthesis 1 Synthesis Recompr. Remux * Analysis 1 2 WP2 CRUD Service TVA 26-27 March 2012 NoTube 3rd review 3
  • 4. Normalisation Web Service – Demo Video –26-27 March 2012 NoTube 3rd review 4
  • 5. Normalisation Web Service – Demo –26-27 March 2012 NoTube 3rd review 5
  • 6. Loudness Web Evaluation26-27 March 2012 NoTube 3rd review 6
  • 7. Web Evaluation - Feedback• Feedback in the community: – Almost 100 participants from >20 countries – >240 views on notube.tv on Dec 1st 2011 (posting of the preliminary results in the blog)• Paper “User Evaluation on Loudness Harmonisation on the Web“ accepted for presentation at the AES 132nd Convention in Budapest, Hungary, 2012 April 26-29. 26-27 March 2012 NoTube 3rd review 7
  • 8. Web Evaluation – Loudness adaptation (descriptive) Preferences of Loudness Adaptations -7 LU (-30 LUFS) 0 LU (-23 LUFS) +4 LU (-19 LUFS) 100 90 80 70 60 % (N=94) 50 40 30 20 10 026-27 March 2012 NoTube 3rd review 8
  • 9. Web Evaluation – Loudness adaptation (analysis) -7 LU (-30 LUFS) 0 LU (-23 LUFS) +4 LU (-19 LUFS) 100 90 80 70 60 50 40 30 20 10 026-27 March 2012 NoTube 3rd review 9
  • 10. Web Evaluation – Loudness range adaptation (descriptive) Preferences of Loudness Range Adaptations 0 dB compression +15 dB compression +25 dB compression 100 90 80 70 60 % (N=94) 50 40 30 20 10 0 Knight and Day Offenbach Beethoven_Lang Lang Shostakovich BMW M5 26-27 March 2012 NoTube 3rd review 10
  • 11. Web Evaluation – Loudness range adaptation (analysis) 0 dB compression +15 dB compression +25 dB compression 100 90 80 70 60 50 40 30 20 10 0 26-27 March 2012 NoTube 3rd review 11
  • 12. Evaluation Summary• Loudness adaptation: – Homogeneous results for all listening parameters under test – Independence from the listening parameters (“age”, “speaker type” and “listening level”) – A strong background noise seems to increase the need for higher loudness levels  Verification of the sufficiently accurate approximation of the human loudness perception for broadcast audio signals by the algorithm defined in EBU R128 and ITU-R BS.1770-2.• Loudness range adaptation: – Results not as homogeneously – Tendency: Participants seem to prefer rather medium or even strong loudness range compression to uncompressed audio with high loudness range. 26-27 March 2012 NoTube 3rd review 12
  • 13. Conclusion• Proof of concept for loudness normalisation using dedicated metadata• Generic approach for loudness normalisation on the web is challenging and could not be achieved in the project• Evaluation shows applicability of ITU-R BS.1770 and EBU R-128 for web applications• Loudness Range for internet should not exceed 20LU (subject to further research) 26-27 March 2012 NoTube 3rd review 13