Loudness 201: Advanced Loudness Webinar
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Transcript of Loudness 201: Advanced Loudness Webinar
![Page 1: Loudness 201: Advanced Loudness Webinar](https://reader034.fdocuments.net/reader034/viewer/2022042507/559e99fc1a28ab0c208b47c2/html5/thumbnails/1.jpg)
Loudness 201
Review of Loudness 101 & Advanced Loudness Discussion
Andrew Sachs
VP. Product Management
Jennifer Knutel
Sr. Dir of Marketing
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How to Participate Today
1. Open and close your Panel
2. Submit text questions
1.
2. Submit text questions
• Q&A addressed at the end of today’s session
• Everyone will receive an email within 48 hours with a link to view a recorded version of today’s session
2.
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• Loudness 101 Review
– Why loudness?
– Specs/Regs including BS.1770-2,
– Gating – reflecting perception, avoid gaming
• Advanced Loudness
Agenda
• Advanced Loudness
– Changes in Regulations – ITU & Countries
– Network Certification – What is this?
– International Carriage Considerations
• Volicon Solution Overview
• Q&A
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Why Loudness?
• Tragedy of the Commons
• Level according to peaks
• Users pay more attention to loud content
– Advertising recognition is higher
– Advertisers KNOW and use this
Difference
is much
larger
than
with analogPGM
Ad
PGM
Ad
PGM
– Advertisers KNOW and use this
• Users feel they need to adjust volume
– Detracting from their overall QoE
– Solution:
• Level according to “loudness perception”
• Content flexibility with good user experience
– Now, what is “loudness perception”?
Volume
Adjustments
No Volume
Adjustments
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Loudness Specifications & Regulations
Specification
What is loudness?
Recommended
BS.1770-2 LKFS gated
Recommended
Practices
How to use loudness
Regulation
How it is enforced
R128Tech 3341/2/3 A/85 RP TR-B32
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Loudness Specification
• BS.1770-2 (03/2011) -Loudness, True Peak & Gating
– Not all frequencies are equal
– Not all (surround) channels are equal– Not all (surround) channels are equal
• Rear Surrounds are overweighted +1.5 dB
• LFE is not counted
– One loudness meas for all channels combined
– Gating to not count quiet periods
• Don’t allow gaming of measurement
• Level gating is in BS-1770-2, Dialog gating is not
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Gating Review - What’s the big deal?
• Gating is critical
– Ensure correlation with loudness perception
– Helps prevent gaming by advertisers
• Gating is specified 2/3 different ways:
– BS.1770-2, EBU, Most of the world – Cascaded level -10dB
x.y
LKFS
gate
– BS.1770-2, EBU, Most of the world – Cascaded level -10dB
– ATSC
• Short Form: No Gating, measure everything
• Long form (>2m) : Dialog Level – aka Dialog gating
• Measurements with different gating – need agreement with:
– Regulatory authority – What is being enforced
– Partners – Studio, Network, Broadcaster, Pay-TV operator
• Troubleshooting Apples v. oranges is not productive
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Changes in Regulations
• Many countries moving forward with loudness regulation
– Brazil, France, …
– Almost all countries are using EBU /BS.1770-2 measurements
– Commercial v. Channel is regulated by all
– Other different items may be regulated– Other different items may be regulated
• Absolute channel tolerance or channel to channel difference (many)
• 5 day channel loudness drift – Italy
• Max S Measurement, - France
• Min Loudness Range – France
• Enforcement is starting….
– Italy- active, US - Dec 2012, many in 2013
– Time to get real
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Considerations for International Carriage
• Content going to one country?
– Design and measure and alarm using local gating and regulations
• Content going to multiple countries?
– Same Gating – possibly different thresholds– Same Gating – possibly different thresholds
• Measure with one gating,
• Alarm on most restrictive thresholds
– Different Gating – e.g. Dialog and Cascaded level
• Measure content twice – once with each Gating
– Differences are unpredictable, no applicable rule of thumb
– -24 LKFS is NOT -23 LUFS!!!
• Apply tightest thresholds for each gating method (by country)
-24 LKFS ����
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ATSC Network Certification – Why?
• Where does the blame fall in the chain?
– Programmer, Network, Broadcaster, MVPD?
RegulatesProtectsEnforces
Network
MVPDCable
Satellite
IPTV
Broadcaster
ProgrammerCable
Network
Blame
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ATSC Network Certification – Why?
• To allow broadcasters and MVPDs to
– Guarantee what they deliver
– Respond to complaint inquiries
– Not redo work performed by others
• Two step process if you do insert ads
– Get certification on Network
– Or certify it yourself
– Guarantee your ad inserts are compliant
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ATSC Network Certification – What?
• Accessible
– Made generally available by Network (web)
– Allows all Broadcaster and MVPDS to access
• Content
– Not regulated – but must convince FCC/MVPDs
– Several approaches
– Legal statement certifiying compliance
– Measurements showing compliance
– Either require backup - Volicon!
PGM1 -23.6 LKFS
COM12 -24.0 LKFS
PGM2 -24.1 LKFS
>..
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ATSC Network Certification – Who
• Who is to provide certification?
– Anyone who wants to help their downstream partners
– Practically – (Cable) Networks
RegulatesProtects
Network
MVPDCable
Satellite
IPTV
Broadcaster
ProgrammerCable
Network
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Observer Loudness Monitoring
• Loudness measurements -LKFS and LUFS -with gating
• Short (S), Medium (M) and Interval (I) measurements
• Up to 7 Short-form Interval (SI) - e.g 10s, 15s, 20s, 30s
• Up to 7 Long-form Interval (LI) - e.g. 6h, 1d, 5d
• Loudness Range (LRA) to measure audio companding• Loudness Range (LRA) to measure audio companding
• Detailed 10Hz measurements - with Audio & Video
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Observer Loudness Monitoring
• Graphing of S, M and I measurements over time
� Multiple channel, multiple meas.
� Graph <=> video time navigation
• Export :
� Logged measurements as csv
� Affidavit - A/V with burned in measurements� Affidavit - A/V with burned in measurements
• Programs Certification Report
� With As-Run-Log Integration
� Loudness of Every Asset
• Alarming (SNMP, email, visual)
� Customizable alarming profiles based on SI and LI measurements
A/V affidavitWith meas Burn-in
export
CSV values report
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Observer Loggers with Loudness
• Software module available on
– Observer, Observer TS, RPM
• Observer family of products are loggers at the core
– Records audio, video & loudness measurements continuouslycontinuously
– 3 to 365 days of storage
• Logger + measurement is very powerful
– Speeds troubleshooting, unambiguous affidavit
– Eliminates Network � Station � MVPD back and forth
Loudness logging is not a sea of numbers. It means
recording the audio, video,
and the loudness measurements.
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• ATSC A/85 RP
• ITU BS. 1770-1 BS.1770-2
• EBU R128 Tech 3341 Tech 3342
• Tech 3343 Tech 3344
Loudness Detail - specs
BS.1770-1 BS.1770-2
a85 rp 2011
EBU R128 Tech 3341 Tech 3342
• Tech 3343 Tech 3344
• FCC Findings Dec 2011 –
• Cable Labs summary of CALM Act
– For Cable Operators only
17
Tech 3343
FCC Calm Act
11-182A1
Tech 3344
CALM act
summary
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Q&A
Please contact us for
additional product information
Andrew Sachs
VP. Product Management
Jennifer Knutel
Sr. Dir of Marketing
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For more information please
contact us ([email protected])
+1 781 221 7400
Andrew Sachs
VP. Product Management
Jennifer Knutel
Sr. Dir of Marketing