Imagine communications Selenio 6800 HUC6800, Installation And Operation Manual

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26 HUC6800
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Installation and Operation Manual
Chapter 3: Operation
Audio Sync and Delay
Audio is synchronized to video by applying the same frame sync delay
and converter delay to the audio associated with that video path.
By changing the
Input Frame Delay control, you can adjust the frame
sync delay and trigger the audio to resynchronize with the video. The
audio synchronization will not occur immediately and will take roughly
10 seconds per frame of delay in order to prevent any audio “glitch.”
You can add additional delay using the
Audio Embedded Pair 1 Delay
to Audio Embedded Pair 4 Delay parameters.
The user delay is always applied in addition to the audio
synchronization and will cause an audio glitch to occur when the user
delay changes.
Video Frame Sync and Delay
The HUC6800
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and HUC6800
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C modules provide upconversion
from SD-SDI to user-selectable HD-SDI standards. During
upconversion, there is a certain amount of delay added to the SD-SDI
input signal in the main video processing path. The amount of delay to
the signal is dependent on the type of processing applied to it.
The SD-SDI input signal is
frame-synchronized to the genlock
reference. A user frame delay control is available to compensate for
other external processes. The user delay interface provides a delay
range between 0 to 6 frames in one-frame increments. This delay is
expressed in SD input units of 525 (NTSC) and 625 (PAL) frames.