User Manual

10
iLM8 – Live User Manual
Work Cited:
1. Fletcher, H. & Munson, W. A. (1933). Loudness, its Definition, Measurement, and Calculation.
2. Allen, J (2010 May 20). Nonlinear Cochlear Signal Processing.
3. Johnston, J. (2006). Loudness Tutorial.
4. Jones, B. L. & Torick, E. L. (1982). A New Loudness Indicator for Use in Broadcasting.
5. Nielsen, S. H. & Skovenborg, E. (2004). Evaluation of Different Loudness Models with Music and Speech
Material.
Using iLM8 - Live to Control Loudness
!
The most valuable tools in determining loudness in your program material include:
• iLM8 - Live Intelligent Loudness Meter – Operators should position iLM8 - Live at various places
within the signal flow to objectively verify that audio loudness levels are within tolerance.
Limited operator training is required to learn the basics of perceptual loudness measurement
and management.
• A Listening Ear – No amount of metering can replace the value of active listening. Broadcasters
should use trained technicians who work in listening environments that accurately represent the
consumer’s expected environment as a final line of defense against inappropriate loudness.
When measuring live content in real-time, operators can use short-term smoothed loudness
measurements to confirm that the mix or overall program audio is adhering to broadcaster-established
guidelines or a governing body’s mandated target. However, when content is stored for playback at a
later time, an opportunity is created for non-real-time loudness measurement.
Each Leq(x) revision results in a different level of correlation between the objective measure and
the human listener’s assessment of loudness. The lowest mean error score was achieved by the
Neural Loudness Measure