Evaluation of the Momentary Time Scale for Live Loudness Metering

Allan J, Berg J. Evaluation of the Momentary Time Scale for Live Loudness Metering. J Audio Eng Soc. 2020;68(3):193-222. doi:10.17743/jaes.2020.0003

@article{Allan2020_20729,
  author = {Allan, Jon and Berg, Jan},
  title = {{Evaluation of the Momentary Time Scale for Live Loudness Metering}},
  journal = {Journal of the Audio Engineering Society},
  volume = {68},
  number = {3},
  pages = {193--222},
  year = {2020},
  month = mar,
  publisher = {Audio Engineering Society},
  doi = {10.17743/jaes.2020.0003},
  url = {https://doi.org/10.17743/jaes.2020.0003}
}

TY  - JOUR
TI  - Evaluation of the Momentary Time Scale for Live Loudness Metering
AU  - Allan, Jon
AU  - Berg, Jan
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 68
IS  - 3
SP  - 193
EP  - 222
PY  - 2020
DA  - 2020/03/06
DO  - 10.17743/jaes.2020.0003
UR  - https://doi.org/10.17743/jaes.2020.0003
PB  - Audio Engineering Society
LA  - en
AB  - Different ballistic definitions for the momentary time scale used in live loudness measurement were evaluated. Definitions from the ITU and EBU were compared as well as a faster version of the ITU version, two asymmetric time scales and the deprecated ballistics, defined in EBU Tech 3205-E, for peak program meters. The goal was to identify the ballistics definition that would function as the best complementary tool to a short-term time scale. Engineers within the broadcast industry and students in audio technology performed an audio alignment task in a simulated live broadcast environment using one ballistics definition per trial. Fader movements and output levels were recorded. After each trial, a set of assessment scales were rated by the subjects. Some results were: a decay time constant of 250 ms yielded better representation of the low-level parts of the dynamics in the signal compared to a 400-ms time constant; the present ITU version of the momentary time scale yielded an estimated less eye fatigue; effects on the resulting output levels, related the gate in ITU-R BS.1770 in conjunction with live compensation of unadjusted audio material were shown.
ER  -