Table of Contents

Loudness Meter

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.

Loudness Meter Monitoring

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.