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 normalisation
PrestoSpace 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
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
0
26-27 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
0
26-27 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
