GUIDE TO INSTALLATION AND OPERATION
110
| XVP-3901
It must be noted that the MOD-LA-DUP-701 has only 6 outputs and the MOD-DOLBY-ENC-D-2/E has only 2 outputs.
In these cases, only the first 6 or 2 channels are used. The MOD-LA-ALC-X-YYY and MOD-JA-ALC-X-YYY modules
may have from 2 to 8 outputs depending on the model used.
The processing delay for all MOD-LA-ALC-X-YYY and MOD-JA-ALC-X-YYY modules is ¼ of a video
frame. To compensate for this processing delay, the user must increase the processing delay of
the card by +1 frame. This additional processing delay must be added manually in the Video
Output page under the Timing tab.
6.1 Dolby E and Dolby Digital (AC-3) decoder
•
Identified as MOD-DOLBY-DEC-2 on the module tab.
The decoder supports Dolby E, Dolby Digital or PCM
signals. Any other non-PCM signal will be lost through the
decoder module; its outputs will be muted.
For a Dolby E input signal, the decoder outputs a metadata
bitstream which may be used by the audio processing and
the audio modules, embedded in the SD outputs, or sent to
the RS-422 output. See the Dolby Metadata tab.
A selector is provided at the Decoder input, but the output
channels of the Decoder are mapped to channels 17 to 24
when module is in slot#1 or channels 25-32 when module is
in slot#2.
6.1.1 Control tab
The
Bitstream Detection Mode
dictates the action taken by
the decoder for each type of input bitstream.
In
Auto
mode, the decoder automatically recognizes and
decodes PCM, Dolby Digital or Dolby E input bitstreams. If
Dolby-E only
is selected, the decoder recognizes and
decodes only Dolby-E bitstreams; otherwise the decoder
outputs are muted. The same behavior applies for the
Dolby
Digital only
selection. If
Mute (OFF
) is selected, all outputs are muted for any type of input bitstreams; the Mute
mode disables the Dolby decoder.
The
Input Selection
determines the Dolby decoder input channel pair. See
Audio Processing/AES Inputs
for the
input selection from the audio card.
The
Decoder Status
section indicates the bitstream format detected at the decoder input. The possible values are:
Dolby-E (16, 20 or 24 bits), Dolby Digital (16 or 32 bits, Channel 1, 2 or both), PCM. The detected Dolby format will
give access to the corresponding tab in the row beside the Control tab.
The
Dolby Digital
section at the bottom of the tab is available only if the input bitstream is Dolby Digital, and the
Detection Mode is Dolby Digital or Auto.
•
Refer to ANNEX 5 at the end of this document:
Dolby Digital Main Channel Output Functions
.
The
Stream Select
parameter selects the stream number to be decoded when multiple Dolby Digital bitstreams are
embedded within a single channel pair.
Figure 5.49 Audio Modules - Dolby Decoder control
Figure 6.1 Audio Modules - Dolby Decoder - Control