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The Loudness Meter provides a standard way to measure the loudness level and loudness range of an audio signal. It is based on the following standards:
EBU R128
ITU-R BS.1770-3
For more information about the loudness, refer to Monitoring the Signal Level.
The Loudness Meter displays the following elements:
|
Interface Element |
Description |
|---|---|
|
Capture |
Starts or stops the integrated loudness capture. The capture is applied on the integrated loudness and the loudness range. It does not have an impact on the momentary or short-term loudness. |
|
Reset |
Resets the current capture. This is equivalent of clicking Capture twice to start and stop the capture. Reseting the capture resets the integrated loudness and the loudness range. |
|
Momentary |
Loudness level calculated using a sliding rectangular time window of length 0.4 seconds. The measurement is not gated. |
|
Short-term |
Loudness level calculated using a sliding rectangular time window of length 3 seconds. The measurement is not gated. |
|
Integrated |
Loudness level calculated during the capture time. The integrated loudness uses gating (all values below -70 LUFS are ignored) and is a long term measurement (an integration over the entire capture time) based on the momentary loudness. The measurement starts when clicking the Capture button, and stops when clicking it again. Clicking the Reset button restarts the capture. |
|
Loudness Range (LRA) |
Loudness range is a statistic calculation of the material's dynamic range corresponding to the integrated loudness measurement using gating (all values below -70 LUFS are ignored). Loudness range measures the variation of loudness on a macroscopic time-scale, in units of LU (Loudness Unit). The measurement starts when clicking the Capture button, and stops when clicking it again. Clicking the Reset button restarts the capture. |
The following loudness levels can be captured in time, in the Performance Monitor:
Momentary Loudness Level - Sync Group 1
Momentary Loudness Level - Sync Group 2
Momentary Loudness Level - Sync Group 3
Momentary Loudness Level - Sync Group 4
Short-Term Loudness Level - Sync Group 1
Short-Term Loudness Level - Sync Group 2
Short-Term Loudness Level - Sync Group 3
Short-Term Loudness Level - Sync Group 4
For more information, refer to Measuring the Loudness in Wwise.
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