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Evaluation of loudness meters using parameterization of fader movements
Luleå University of Technology, Department of Arts, Communication and Education, Media, audio technology and experience production and theater.
Luleå University of Technology, Department of Arts, Communication and Education, Media, audio technology and experience production and theater.
2014 (English)In: Audio Engineering Society Convention 135, Audio Engineering Society, Inc., 2014, p. 652-662Conference paper, Published paper (Refereed)
Abstract [en]

The EBU recommendation R 128 regarding loudness normalization, is now generally accepted and countries in Europe are adopting the new recommendation. There is now need to know more about how and when to use the different meter modes, Momentary and Short term, proposed in R 128, as well as to understand how different implementations of R 128 in audio level meters affect the engineers' actions. A method is tentatively proposed for evaluating the performance of audio level meters in live broadcasts. The method was used to evaluate different meter implementations, three of them conforming to the recommendation from EBU, R 128. In an experiment, engineers adjusted audio levels in a simulated live broadcast show and the resulting fader movements were recorded. The movements were parameterized into "Fader movement", "Adjustment time", "Overshoot", etc. Results show that the proposed parameters produced significant differences caused by the meters and that the experience of the engineer operating the fader is a significant factor

Place, publisher, year, edition, pages
Audio Engineering Society, Inc., 2014. p. 652-662
National Category
Other Humanities not elsewhere specified
Research subject
Audio Technology
Identifiers
URN: urn:nbn:se:ltu:diva-27749Local ID: 14947d71-d2fa-430c-b522-85af46ad4ae2OAI: oai:DiVA.org:ltu-27749DiVA, id: diva2:1000938
Conference
Audio Engineering Society Convention : 17/10/2013 - 20/10/2013
Note
Godkänd; 2014; 20140403 (johsod)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2019-01-05Bibliographically approved
In thesis
1. Evaluation of Live Loudness Meters
Open this publication in new window or tab >>Evaluation of Live Loudness Meters
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Discrepancies in loudness (i.e. sensation of audio intensity) has been of great concern within the broadcast community. For television broadcast, disparities in audio levels have been rated the number one cause to annoyance by the audience. Another problem area within the broadcast and music industry is the loudness war. The phenomenon is about the strive to produce audio content to be at least as loud or louder to any other audio content that it can easily be compared with. This mindset, when deciding for audio level treatment, inevitably leads to an increase in loudness over time, and also, as a technical consequence, a decrease of utilized dynamics. The effects of the loudness war is present in both terrestrial radio transmissions as well as in music production and in music distribution platforms.

The two problems, discrepancies in loudness and the loudness war, both emanate from the same source; regulations of audio levels and the design of measurement gear have not been amended to cope with modern production techniques. At the time when the work on this thesis started, the ruling technical recommendations for audio level alignment were based on peak measurement. This measured entity has poor correspondence to loudness. To counter the above described problems, the European Broadcasting Union (EBU) and the International Telecommunication Union (ITU) has developed new recommendations for audio alignment, EBU R 128 and ITU-R BS.1770. The new definitions for loudness measurement constitutes simplified models on the human perception of audio intensity. When using the new recommendations in production, the problems have been shown to diminish.

For an engineer in a live broadcast scenario, measurement equipment also need to be updated in real-time to illustrate a time-variant loudness of the signal. EBU and ITU also has regulated how this type of measurement gear should behave. EBU Tech 3341 and ITU-R BS.1771 define properties for live loudness meters. These recommendations has since the time of publication been implemented in measurement equipment from manufacturers and become available in production facilities.

This thesis investigates the conceptions that have led up to the present recommendations for live loudness meters. It maps out the (at the time) present ways to evaluate the same. Emanating from this knowledge, a new methodology to evaluate loudness meters is proposed that combines qualities from former methods to achieve an alternative balance between ecological validity and control in the experiment design. The methodology includes a procedure to capture data from engineers’ actions and the resulting audio levels from simulated broadcast scenarios. The methodology also incorporates a way to process this type of data into different parameters to be more accessible for interpretation. It presents an approach to model the data, by the use of linear mixed models, to describe different effects in the parameters as the result of the meters’ characteristics. In addition, a review on publications that examine the engineers’ own requests for beneficial qualities in a loudness meter has been condensed and revised into a set of meter criteria that specifically is designed to be applied on the outcome of the mixed models. The outcome of the complete evaluation yields statements on meter quality that are different and complementary to formerly proposed methods for meter evaluation.

The methodology has been applied in two different studies, which also are accounted for in the thesis. The conclusions from these studies has led to an increased understanding of how to design live loudness meters to be satisfactory tools to the engineer. Examples of findings are: the effect of the speed of the meter, as being controlled by one or several time constants, on the readability of the meter and the dispersion in output levels – some tested candidates, with higher speed than the present recommended ones, has been shown to be adequate as tools; the three-second integration time has been shown to generate a smaller dispersion in output levels than the 400 ms integration time; the effect of the gate in BS.1771 on the resulting output levels– the gate generally leading to an increase in output levels. The acquired knowledge may be used to improve the present recommendations for audio level alignment, from EBU and ITU.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2019
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
loudness, loudness metering, live loudness meter, loudness meter, audio level alignment, R 128, hörstyrka, mätning av hörstyrka, loudnessmätare, hörstyrkemätare, nivåjustering, R 128, upplevd ljudnivå
National Category
Media Engineering Other Humanities not elsewhere specified
Research subject
Audio Technology
Identifiers
urn:nbn:se:ltu:diva-72465 (URN)978-91-7790-296-6 (ISBN)978-91-7790-297-3 (ISBN)
Public defence
2019-03-01, L165, Snickargatan 20, Piteå, 13:00 (English)
Opponent
Supervisors
Funder
Interreg Nord
Available from: 2019-01-07 Created: 2019-01-05 Last updated: 2019-02-14Bibliographically approved

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