In Broadcast - October/November 2011 - 81


OCTOBER/NOVEMBER 2011 | WWW.INBROADCAST.COM

InTEST
Loudness Measuring In Workflows
By Ralph Bachofen, Triveni Digital
Ralph Bachofen, VP of sales and Head of Marketing, Triveni Digital

Inconsistent loudness levels have become so common a complaint in broadcast markets worldwide that lawmakers and regulators in a variety of countries have created guidelines and standards designed to mitigate the audio-level discrepancies that occur as television viewers move from channel to channel and as broadcasts shift between programming and advertisements.
In the US, audio loudness regulation has been introduced through the Commercial Advertisement Loudness Mitigation Act (CALM Act). In Europe, the EBU and AGCOM are addressing the same issue. In the realm of monitoring, this industry-wide trend in signal management has introduced yet another layer of DTV stream monitoring and analysis, formally requiring that loudness parameters be measured and standards met by broadcasters. As a result, broadcasters and TV stations must not only implement loudness monitoring systems, but also be able to demonstrate their compliance with current regulations. To aid broadcasters in adapting to new loudness regulations, Triveni Digital’s StreamScope provides comprehensive real-time analysis and verification of DTV transport streams with integrated loudness monitoring. Widely deployed to facilitate endto-end MPEG-2/MPEG-4 transport stream analysis and monitoring for DTV services carried by broadcast, cable, satellite, IPTV, or mobile networks, the StreamScope Analyzer has long included audio monitoring capabilities including dialnorm. The latest StreamScope software release extends these capabilities by allowing users to monitor and analyze audio loudness in the compressed domain according to ITU-R Recommendation BS.1770 (as required by ATSC Recommended Practice A/85, which emphasizes audio measurement, production, and monitoring techniques intended to ensure consistent loudness control across DTV content). With this loudness monitoring capacity, the broadcaster or TV station can continuously log and export accurate LKFS / LUFS loudness measurements of broadcasts in real time. Furthermore, these broadcast facilities can maintain evidence of compliance, which can be critical in forensic reporting to regulatory bodies. Using the StreamScope, operators can use a single GUI and screen to measure individual audio channel loudness, establish dialnorm loudness monitoring and error reporting, and plot loudness values.

Triveni Digital’s StreamScope MT-40

The StreamScope supports the AC-3, MPEG-1, AAC and AAC plus audio encoding formats, providing the user with an “Audio” tab – part of the Summary view, along with a “Thumbnails” tab and “Programs” tab – that displays the measured loudness for each program in the active input. In supporting the audio loudness measurement according to international standard ITU-R BS.1770-1, the system measures the loudness level on all audio PIDs in the transport streams being monitored in accordance with the standard and reports two loudness values in LKFS: shortterm loudness and long-term loudness. To measure and manage dialnorm levels, the operator can set the threshold on the loudness deviation from the dianorm value, as well as the threshold for the absolute loudness data. The StreamScope MT-40 decodes the dianorm value encoded in the AC-3 audio stream and compares the measured loudness with the dianorm value. In theory, the dialnorm value should be equal to the measured loudness, with small deviation. The monitoring system calculates the difference between the measured short-term loudness and the dialnorm value and triggers an alarm if the difference goes out of the boundary that has been set. The StreamScope also compares the measured loudness values with the absolute loudness thresholds set by the user and triggers an alarm if the loudness goes out of the bounding values. All of the audio loudness errors monitored by system are saved in the system database, they can be searched, viewed, and analyzed at a later time. By offering this essential information within the same interface that provides videohealth and stream-health data, the StreamScope system reduces the number of components required across the broadcast plant and simplifies the overall task of maintaining compliance with both new and established regulations for DTV delivery.

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Table of Contents for the Digital Edition of In Broadcast - October/November 2011

In Broadcast - October/November 2011
Contents
3Ality Digital Acquire Element Technica
RTL Choses Quantel
Studios In Production
MAM Questions Answered
Changing Faces of Post Production
Microphones In Action
New Developments in Audio for Television
Routers and Switchers
Loudness Measuring in Workflows
In Broadcast - October/November 2011 - In Broadcast - October/November 2011
In Broadcast - October/November 2011 - 2
In Broadcast - October/November 2011 - Contents
In Broadcast - October/November 2011 - 3Ality Digital Acquire Element Technica
In Broadcast - October/November 2011 - 5
In Broadcast - October/November 2011 - 6
In Broadcast - October/November 2011 - 7
In Broadcast - October/November 2011 - 8
In Broadcast - October/November 2011 - 9
In Broadcast - October/November 2011 - 10
In Broadcast - October/November 2011 - 11
In Broadcast - October/November 2011 - 12
In Broadcast - October/November 2011 - 13
In Broadcast - October/November 2011 - 14
In Broadcast - October/November 2011 - 15
In Broadcast - October/November 2011 - 16
In Broadcast - October/November 2011 - 17
In Broadcast - October/November 2011 - 18
In Broadcast - October/November 2011 - 19
In Broadcast - October/November 2011 - RTL Choses Quantel
In Broadcast - October/November 2011 - 21
In Broadcast - October/November 2011 - 22
In Broadcast - October/November 2011 - 23
In Broadcast - October/November 2011 - Studios In Production
In Broadcast - October/November 2011 - 25
In Broadcast - October/November 2011 - 26
In Broadcast - October/November 2011 - 27
In Broadcast - October/November 2011 - 28
In Broadcast - October/November 2011 - 29
In Broadcast - October/November 2011 - 30
In Broadcast - October/November 2011 - 31
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In Broadcast - October/November 2011 - 34
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In Broadcast - October/November 2011 - 43
In Broadcast - October/November 2011 - 44
In Broadcast - October/November 2011 - 45
In Broadcast - October/November 2011 - 46
In Broadcast - October/November 2011 - 47
In Broadcast - October/November 2011 - MAM Questions Answered
In Broadcast - October/November 2011 - 49
In Broadcast - October/November 2011 - Changing Faces of Post Production
In Broadcast - October/November 2011 - 51
In Broadcast - October/November 2011 - Microphones In Action
In Broadcast - October/November 2011 - 53
In Broadcast - October/November 2011 - 54
In Broadcast - October/November 2011 - 55
In Broadcast - October/November 2011 - 56
In Broadcast - October/November 2011 - 57
In Broadcast - October/November 2011 - 58
In Broadcast - October/November 2011 - 59
In Broadcast - October/November 2011 - 60
In Broadcast - October/November 2011 - 61
In Broadcast - October/November 2011 - 62
In Broadcast - October/November 2011 - 63
In Broadcast - October/November 2011 - New Developments in Audio for Television
In Broadcast - October/November 2011 - 65
In Broadcast - October/November 2011 - 66
In Broadcast - October/November 2011 - 67
In Broadcast - October/November 2011 - 68
In Broadcast - October/November 2011 - 69
In Broadcast - October/November 2011 - 70
In Broadcast - October/November 2011 - 71
In Broadcast - October/November 2011 - Routers and Switchers
In Broadcast - October/November 2011 - 73
In Broadcast - October/November 2011 - 74
In Broadcast - October/November 2011 - 75
In Broadcast - October/November 2011 - 76
In Broadcast - October/November 2011 - 77
In Broadcast - October/November 2011 - 78
In Broadcast - October/November 2011 - 79
In Broadcast - October/November 2011 - 80
In Broadcast - October/November 2011 - Loudness Measuring in Workflows
In Broadcast - October/November 2011 - 82
In Broadcast - October/November 2011 - 83
In Broadcast - October/November 2011 - 84
In Broadcast - October/November 2011 - 85
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