Grass Valley AAP-1741 - Manual (Page 23)

GUIDE TO INSTALLATION AND OPERATION
AAP-1741 | 19
3.3.4.2 UP/DOWN-MIX – UP-MIX tab:
This feature is used to create from a stereo source a
multi channel compatible audio signal with up to six
channels: Left, Right, Center, Left Surround, Right
Surround and the Low Frequency Effect.
The selection of the stereo source is done with the
two pull down boxes Left Source and Right Source.
The pull down box Type offers three different
standard mixes and a custom position. The proposed
standard mixes are named Speech, Music and
Movie
. For each standard, an Effect slider allows to
keep the Effect very light, with the slider down to 0, or
emphasized when going to 10.
The Custom position leaves all the settings available
to the user for specific needs.
3.3.4.3 UP/DOWN-MIX – DOWN-MIX tab:
This tab provides resources to control the downmix of
a “5.1 channel” surround-sound audio signal into an
LtRt or LoRo stereo pair. The 5.1 terminology refers
to six discrete audio channels, with the low-frequency
channel of limited bandwidth designated as the .1
channel.
The default source channels are CH9 to CH14, an
input Shuffler allows any combination of the input
channels. The Down-mix stereo pair is mapped into
audio channels 15 and 16.
The mixing configuration is defined with pull down
boxes.
Mode:
• OFF disables the audio down-mix. The audio
channels 15 and 16 pass through
unchanged.
• LtRt: enables the down-mix of 5.1 channels
into an LtRt matrix surround encoded
stereo pair. The input signals on
channels 15 and 16 are discarded.
• LoRo: enables the down-mix of 5.1 channels
into an LoRo stereo pair, which is a
conventional stereo signal. The input
signals on channels 15 and 16 are
discarded.