New Research on Audio Loudness for Mobile TV and Podcast
Thomas Lund reveals research results and offers a practical three-step guide to optimizing audio for a variety of mobile platforms and brands.
Our CTO for Broadcast & Production, Thomas Lund, has taken a
number of mobile devices, including Apple's iPhone and iPad, to the
test bench at the 'TC Lab'.
Based on the test results, he determines that -16 LUFS/LKFS is a suitable target level when making the transition from HD Audio to Mobile Platforms. It is not recommended that you push the level up further, but rather integrate a process of three simple steps to simulcast HD Audio to mobile that doesn't wash out the distinction between foreground and background sound.
It is also not recommended that you let audio sit as low as on regular TV, because some programs will not be able to play loudly enough for a listener on the move. This has happened to the author of the paper a number of times, which led him to carry out the experiment and come up with a practical guide to how this problem can be addressed.
Thomas Lund also elaborates on perception, clarity and speech intelligibility before concluding that the 400 ms sliding window of Momentary Loudness in EBU and ITU standards is a well-indicated choice.
The paper was originally written for the Broadcast Engineering Conference at the 2013 NAB Show at which the research results were presented for the first time.
About Thomas Lund
Thomas Lund was among the first to document the sonic consequences of the 'loudness wars' in music production, and for more than a decade, he has presented papers on loudness and true-peak level at relevant audio conferences around the globe, e.g. AES, InterBEE, NAB, Tonmeistertagung, and SET.
Drawing on a background in medical science, Lund has played a significant role in how broadcast standards have emerged and evolved away from proprietary technology and towards the transparent and facts-based solutions of today.