GUIDE TO INSTALLATION AND OPERATION
XVP-3901 |
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AUTO: Sample rate conversion is automatic, based
on the input audio type. Sample rate
conversion is enabled for PCM audio, and
bypassed for non-PCM audio.
5.6.4 Status tab
The Status tab reports the type of audio present at the input
and the Dolby-E alignment.
Audio Type Status:
•
PCM – the audio channel carries PCM audio
(orange)
•
Dolby E – the audio channel carries Dolby E
encoded audio (blue)
•
AC3 – the audio channel carries Dolby Digital (AC-3)
encoded audio (violet)
•
NPCM – the audio channel carries non-PCM other
than Dolby E or Dolby Digital (AC-3) (yellow).
Dolby-E Alignment:
•
When Dolby-E audio is present, this panel will
display the offset/delay between the Dolby-E and the
video output timing of the card. You may click the
Auto Align button to automatically adjust the audio
timing delay to ensure a perfect alignment with the
video. This is equivalent to changing manually the
audio delay in the audio processor. If you change
the output timing of the card or the video output
format, you may have to re-align the Dolby-E.
•
The offset is not available for any type of audio other
than Dolby-E.
The measured Dolby-E offset can be a positive OR a
negative value. A negative value indicates the Dolby-E is in
advance compared to the video and additional delay should be added to the audio channel pair.
A positive value indicates the Dolby-E is late compared to the video and the audio delay must be reduced for this
channel pair. Sometimes, the audio delay cannot be compensated because it would mean to have an audio delay
lower than the processing delay of the card. In this case, you have to add an extra frame delay to the video to provide
more range to the audio delay.
5.7 Dynamic Proc. panel
This panel provides controls for dynamic processing of the audio passing through the XVP-3901. The audio
processing (XVP-3901-OPT-AUD) and the dynamics processing (XVP-3901-OPT–DP) options must be activated to
access this functionality. Individual and independent controls are provided for each of the 32 channels.
These parameters affect the output audio channels (HD/SD embedded and AES), the audio channels assigned to the
Dolby-E/Digital encoder modules, as well as the audio channels sent to the DAP or UAP
companion cards.
Note that unlike the audio processing configuration, only one (1) dynamic processing configuration is saved by the
card, regardless of the input format (3G/HD or SD).
Figure 5.47 Audio Processing - Status tab