Dolby Laboratories DP570 - Manual (Page 62)

50 Dolby ® DP570 Multichannel Audio Tool User’s Manual
Using the DP570 in Live Remote Broadcast Using the DP570 with Other Dolby Equipment
6.2.2 Monitoring the Dialogue Level
As you work, check the dialogue level indicators—the yellow numbers shown in
Figure 6‐3—frequently. Make adjustments to the mix to keep the dialogue level value
(during periods of representative speech) within a few decibels of your target.
6.2.3 Monitoring Downmixes
Check downmixes occasionally and make sure the announcer and other important speech
elements are not buried during stereo downmixing or Pro Logic decoding.
6.3 Using the DP570 with Other Dolby Equipment
The Cat. No. 549 GPI/O Controller allows quick changes of downmix and compression
modes while monitoring. The DP570 can be used either with the DP569 Dolby Digital or
DP571 Dolby E Encoders by attaching the metadata connectors.
6.4 Using Unity Gain Mode
Unity Gain mode, detailed in Unity Gain Mode on page 39, allows the output of the DP570
to match preprocessed signals to simplify comparisons during the mixing process.
6.5 Monitoring Metadata
The following highest‐priority parameters have the greatest impact on your work. We
suggest you address them in this order:
1. Program configuration: the number of type of programs included in the Dolby E
stream.
2. Channel mode: the number of audio channels in the program; set it once for each
program.
3. Dialogue level: the dialnorm parameter. Compare the measured value (shown in
yellow numbers) to the dialnorm metadata parameter value (shown in green
numbers) periodically as you work.
4. Compression mode: select one that sounds best; None is not recommended as it may
cause peak limiting in a consumerʹs decoder during downmixing. For more
information on compression modes, see
Dynamic Range Control on page 88. Set it
once for each program.
5. Surround –3dB flag on 5.1 programs only: this parameter should be set to Disabled.
6. Downmix parameters: set according to taste.
• Center downmix level
• Surround downmix level
• Preferred stereo downmix
Note: Ensure that these parameters are set correctly because other parameters depend on
them.