Dolby Laboratories DP570 - Manual (Page 42)

30 Dolby ® DP570 Multichannel Audio Tool User’s Manual
Using the DP570 Features Monitoring Downmixes
4.6 Monitoring Downmixes
The DP570 allows you to audition various downmixes before finalizing the content.
Previewing downmix conditions is essential in providing the best possible audio quality in
listening environments with fewer speakers. Select a Downmix mode and make necessary
adjustments to the metadata or the source mix accordingly.
You can set up separate sets of speakers for different downmix conditions, sending a stereo
downmix to the left and right speakers in your 5.1 listening environment, then to a
different set of stereo speakers just by changing your speaker selection setting. It is a good
idea to have a low‐grade alternate speaker configuration set up to monitor the stereo and
mono downmixes to make sure program content plays appropriately in
“fidelity‐challenged” environments.
To monitor the various downmixes in the DolbyRemote 570 application, click any of the
buttons shown in Figure 4‐3, then adjust settings on the metadata tabs as necessary.
Figure 4-3 Downmix Options
4.7 Measuring and Setting the Dialogue Level
The dialogue level parameter, also known as dialogue normalization or dialnorm, is a vital
element in audio content creation. The proper dialogue level value ensures that the
consumer hears different programs at the same level. See
Dialogue Level on page 86 for a
detailed explanation of the dialogue level parameter. The dialogue level for each program
must be carefully measured and then appropriately set. This is easy using the control in the
Dialogue Level Set area of the DolbyRemote 570, shown in Figure 4‐4.
Figure 4-4 Measurement Control Options
4.7.1 Identifying Normal or Average Level Program Segments
To set the dialogue level parameter, the first and most important step is selecting audio clip
samples that represent the average loudness level of the program content. Remember that
the dialogue level parameter establishes the level for normal dialogue in the program;
quieter and louder scenes tend to show higher or lower measurements than the correct
value. Using more than one clip is worthwhile particularly in programs that feature