Dolby Laboratories DP570 - Manual (Page 46)

34 Dolby ® DP570 Multichannel Audio Tool User’s Manual
Using the DP570 Features Setting Dynamic Range Control
3. The default measurement mode is Infinite. Click the Infinite or Short Term button to
move back and forth between the modes.
The software displays the level of the audio clip. This level is displayed until you start
a new measurement or change modes.
4. Repeat these steps with each audio clip selected. The DP570 should return similar
values for each of the clips. If the variation between the clips is 4 dB or less, select a
value for the dialogue level parameter within that range that best indicates the
average level of the program content. At any time, to use the measurement level
displayed on the software, click Accept, and the dialogue level parameter is set at that
level. To set the dialogue level parameter manually, click and drag the Dialogue Level
Set slider to the setting you want.
4.8 Setting Dynamic Range Control
You can choose dynamic range control (DRC) profiles for RF and Line modes. Use the
emulator to monitor the effects of each profile setting on the program content and select the
profile that best suits the material in each mode. Both RF and Line modes can be set to any
of the following profiles: None, Film Standard, Film Light, Music Standard, Music Light,
and Speech. Each profile is a set of compression parameters such as ratio, attack, and
release.
For detailed information, see Dynamic Range Control Profiles on page 89.
The Custom adjustment on the emulator allows you to simulate a consumer decoder with
the ability to vary the amount of DRC applied. This variation is to the Line mode profile
you have selected. Like all emulator controls, it does not affect the metadata or router
output streams.
To modify the default profile in the remote software, use the drop‐down lists and check
boxes on the Dynamic Range metadata tab.
4.9 Holding Metadata
The Metadata Hold button shown in Figure 4‐6 allows you to repeat the selected metadata
for as long as you like. When you press it, the DP570 “holds” the metadata for the current
frame and repeats it in each frame until you click the button again to turn the feature off.
Figure 4-6 Metadata Hold Button
Tip: If the DP570 measures more than a 4 dB difference in the audio clips, reconsider the
clips you have chosen, recalling that these clips should represent normal speech
level in your content.
Tip: Remember to set the dialogue level parameter properly before making judgments
about DRC.