Dolby-E Automatic Header Alignment; Audio Delay Ranges; External Audio Processing Delay - Imagine communications HMX6803 Plus Installation And Operation Manual

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Dolby-E Automatic Header Alignment

When you embed Dolby E audio, the module automatically adjusts input audio delay such
that the Dolby E header resides on the line specified by the Dolby E Start Line parameter,
with a tolerance of ±1 line.
Start Line parameter.
Table 3-4 Dolby E Automatic Header Alignment by Video Standard
Video Standard
525
625
1080i/p/psF
720p
Audio Delay Depending on the amount of delay applied to the video stream, the available range for the
audio delay parameters varies. The ranges are listed in
Ranges
Table 3-5 Audio Delay Range Depending on the Amount of Video Delay
Condition
Video Delay greater than 31
frames
Video Delay less than 32
frames
For Dolby-E automatic header alignment to operate correctly, the input SDI must be
frequency locked to the same reference source as the Dolby-E source.

External Audio Processing Delay

Set the External Audio Delay parameter to the amount of processing delay that is
incurred by external audio before it enters the HMX6803+. While external audio delay is
not tracked by the audio synchronizer, an equivalent amount of video delay is applied to the
video path to realign the output video with the externally applied audio.
The Actual Video Delay Used parameter monitors the amount of additional video delay
applied. This parameter is a sum of this compensating video delay plus any video delay
applied using the Video Delay parameter, measured in frames.
Set the associated SRC (1-16) Ext Audio Align parameter to On. (To determine which SRC
is the source of the externally processed audio, check the parameter settings within the
Input > Audio > Routing menu.) This ensures the externally processed audio is realigned
with output video once it is output from the module (embedded or AES output).
EQ Pathological
PLL Pathological
Table 3-4
Range
13–25
9–30
15–54
20–71
Parameters
Input Audio Ch 1–16 Delay
Input Audio AES 1A–4B Delay
Input Audio Ch 1–16 Delay
Input Audio AES 1A–4B Delay
Installation and Operation Manual
shows the ranges and default values for the Dolby E
Default
15
11
19
25
Table 3-5.
Range
0 to 660.00 ms
0 to 1320.00 ms
HMX6803+ and OP+HMX+ 31