Grass Valley ADX-1901 - Manual (Page 25)

GUIDE TO INSTALLATION AND OPERATION
ADX-1901 | 21
Each of these has predetermined values for Target, Short Term Time Window and Relative Gating, as shown in the
table, and which are displayed in gray in their (inactive) pull-downs in the panel.
If you select Custom in the Meter Mode pull-down, these parameters can all be selected in order to define a custom
mode.
5.7 Downmix panel
This tab provides resources to control the downmix of a “5.1 channel”
surround-sound audio signal into an LoRo stereo pair. The 5.1
terminology refers to six discrete audio channels, with the low frequency
effect (LFE) channel of limited bandwidth designated as the “.1” channel.
The Input channels are automatically assigned to the 3/2 or 3/2L
program defined in the "Audio Program" tab. If no such program is
defined, the panel is inoperative and a warning is displayed:
Downmix:
Operating Mode: Use the pulldown to select the downmix operating
mode:
• OFF: Downmix is disabled. Input channels pass through
unchanged.
• Manual: Downmix follows the downmix parameters manually
configured by the user.
Level Normalization: use the pulldown to select the type of normalization to be applied on the downmix output level.
• OFF: Downmix output level is not normalized. Clipping may occur depending on the input channel levels and
the selected mix levels.
• Level A: Downmix output level is normalized based on the applied mix levels to provide a uniform output over
the range of mix levels available. Clipping will never occur, even with full scale input channels and mix
levels.
Output Channels: Select the audio channels whose content will be replaced by the output of the downmix processor
• 1-2
• 3-4
• 5-6
• 7-8
• This selection is not available when the Operating Mode is OFF (downmix disabled).
Manual Downmix Config
• When Manual Operating Mode is selected in the pulldown above, these controls are active.
Mode: this pulldown menu selects the downmix mode, which is forced to the default value:
• LoRo: Enables the downmix of 5.1 channels into an LoRo (Left only Right only) stereo pair, which is a
conventional stereo signal. The input signals on the channel pair selected as the Output Channels are
discarded.
Figure 5-11 Downmix tab