Grass Valley DAP-1781 - Manual (Page 49)

GUIDE TO INSTALLATION AND OPERATION
DAP-1781 | 49
LoRo:
This mode enables the downmix of 5.1
channels into an LoRo stereo pair,
which is a conventional stereo signal.
The LoRo downmixing process adds a
latency of 41.7 µs (2/48000 samples)
through the card. To keep control on
the processing delay, the tracking
delay has to be larger than 3 ms and
with a stand alone card select a fixed
delay larger than 3 ms.
4.7 upMAX
TM
Linear Acoustics Upmixer
Option
This optional upMAX
TM
Upmixer module supports
under license the Linear Acoustic upMAX
TM
5.1
channel surround-field synthesizer. This processing
creates downmix compatible Left, Right, Center,
Surround and LFE channels from the two channel
main input.
The Operating Mode pull-down box offers four
different processing solutions:
• PASS Mode
Select the input channel pair to the L/R, C/LFE, Ls/Rs
inputs with the pull-down menus. These channels are
passed through unaltered and are assigned to CH9 to
CH14 with the indicated mapping.
• UPMIX Mode
Select the input channel pair to the L/R input with the
pull-down menu. The resulting 5.1 channels are
assigned to CH9 to CH14 with the indicated mapping.
• AutoMAX/AutoMAX-II TM
Mode
Select the input channel pair to the L/R input with the
pull-down menu. The resulting 5.1 channels are
assigned to CH9 to CH14 with the shown mapping.
Additionally the channels selected at the C, LFE, Ls
and Rs inputs are summed with the outputs of the
upmixing process.
This mode also allows a 5.1 audio present at the input to pass through. It will auto switch between a stereo
and a 5.1 audio source to provide a 5.1 output at all times.
• Set up the transition between the two modes to be unobtrusive by selecting transition speeds for each
case – upmix-to-pass and pass-to-upmix – using the two AutoMAX-II Transition Speed pulldowns
• Use the 5.1/2.0 Detection Threshold slider to set the level at which some 5.1 channels are considered
to be silent, identifying the input as 2.0