While EBU R128 aims to measure global perceived loudness, irrespectively of the audio material, Dolby Dialogue Intelligence is a patented technology designed to specifically measure the perceived loudness of dialogue elements in the audio. It is therefore targeted towards broadcast applications.
Dialogue Intelligence replaces EBU R128’s level-based gate with a speech-content ratio based gate. The algorithm computes several low-level features for the incoming signal in speech channels. These are then combined into an overall speech percentage figure. When speech content is detected, Integrated Loudness </link> is computed from the speech channels which have a speech content ratio above a certain threshold (see Dolby Dialog Intelligence</link>).
When other material is detected, i.e. not speech, standard EBU R128 Integrated Loudness </link> computation is employed.
The current speech content is displayed as text below the current gate status.
Additionally, color coding indicates the speech content ratio.
Speech : speech content present
: high speech content
: medium speech content
: low speech content
: other material present
The sophistication of the algorithms employed in Dialogue Intelligence incur an overall latency of 2048ms (approx. 2s).
When Dialogue Intelligence is enabled, the display of other Loudness </link> values is compensated to make sure meter readings are consistent. Other</link> real-time meter (RMS</link>, TruePeak) displays are not compensated, as we feel in this case maintaining the best reactivity to the incoming signal is more important.
All meter statistics are time-aligned.
Channels</link> taken into account by the algorithm are determined based on the current channel configuration.
For mono/stereo signals, all channels are taken into account. For surround configurations, only Left/Right and Center channels are taken into account, if present.
Dialogue Intelligence computation only affects I (Integrated) Loudness </link> values. Toggling Dialogue Intelligence on and off forces a reset of the meter values.
Created under license from Dolby Laboratories Licensing Corporation. Use of this Software does not convey a license nor imply a right under any patent, or any other industrial or intellectual property right of Dolby Laboratories.
Dolby and the double-D symbol are registered trademarks of Dolby Laboratories. Dialogue Intelligence is a trademark of Dolby Laboratories.
PATENT LIST - DIALOGUE INTELLIGENCE
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