Rt lt lf r sr sl – Grass Valley DAP-1781 User Manual
Page 48
GUIDE TO INSTALLATION AND OPERATION
48 | DAP-1781
Table 3: Current Downmix Settings
Legend
Follow Metadata Config
Default Config
Manual Config
Metadata
Status
Metadata Parameters
Downmix Configuration
Current Downmix Settings
Input
Primary/
Backup
Metadata
Input
Primary/Backup
Metadata Prog 1
Ext BSI *
Backup
Metadata Prog 1
Ext BSI *
Operating
Mode
Reversion
Mode
Downmix
Mode
Dialnorm
Center and
Surround Mix
Levels
Present
Downmix mode
= Lt/Rt
Follow
Metadata
Lt/Rt
Metadata
Metadata
Present
Downmix mode
= Lo/Ro
Follow
Metadata
Lo/Ro
Metadata
Metadata
Present
Downmix mode
= Not indicated/
Reserved
Follow
Metadata
Default
Metadata
Metadata
Present
Ext BSI
does not exist
Follow
Metadata
Default
Metadata
Default
Absent
Downmix mode
= Lt/Rt
Follow
Metadata
Backup
Metadata
Lt/Rt
Metadata
Metadata
Absent
Downmix mode
= Lo/Ro
Follow
Metadata
Backup
Metadata
Lo/Ro
Metadata
Metadata
Absent
Downmix mode
= Not indicated/
Reserved
Follow
Metadata
Backup
Metadata
Default
Metadata
Metadata
Absent
Ext BSI
does not exist
Follow
Metadata
Backup
Metadata
Default
Metadata
Default
Absent
absent **
Follow
Metadata
Backup
Metadata
Default
Default
Default
Absent
Follow
Metadata
Default
Default
Default
Default
Manual
Manual
Manual
Manual
* Metadata Prog 1 Ext BSI: Metadata Program 1 AC-3 Extended Bitstream Information, Preferred Stereo
Downmix Mode.
** The selected Backup Metadata source in the Metadata panel is either an external input (RS-422, Decoder,
A-BUS) that currently does not contain metadata or Blank (no metadata is generated).
Downmix Modes: Additional Information
LtRt:
This mode enables the downmix of 5.1
channels into an LtRt matrix surround
encoded stereo pair.
This LtRt downmixing process adds a
16.7 ms processing (801/48000 samples),
the minimum delay becomes 18.9 ms
(16.7 ms + 2.2 ms).
To keep control on the latency, when
coupled to a video card, the tracking delay
has to be larger than 19 ms, and with a
stand alone card select a fixed delay
larger than 19 ms.
LtRt
Normalized
+
C mix
+
+
+
LF mix
C
L
+
S mix
O
R mix
L mix
+
+
-
Rt
Lt
LF
R
SR
SL