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Runco SC-30d/SC-35d Installation/Operation Manual 27
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Audio/Video
Synchronization Issues
Due to its extraordinarily high level of video processing performance, the Dimension Digital
Controller may distribute video signals with a perceptible level of audio latency. In order to
easily solve this issue, Runco recommends using the Dimension Digital Controller with a
high-quality audio receiver that has the ability to effectively synchronize audio and video
signals.
Most mainstream audio receiver/switchers have the ability to synchronize the audio and
video to the Advanced Television Systems Committee (ATSC) prescribed tolerances.
According to the ATSC, the sound program should never lead the video program by more
than 15 milliseconds, and should never lag behind the video program by more than 45
milliseconds.
In addition, many video displays and A/V receivers introduce additional latency that needs
to be compensated for during the installation.
Table 3-5 shows the amount of possible audio latency given different signal input timings.
For best performance, always use “first-surface” mirrors in your
rear-projection installation (as opposed to conventional,
“second-surface” mirrors with the reflective surface behind a
transparent substrate such as glass or acrylic).
First-surface mirrors provide a strict reflection without the
“ghosting” effect seen with a second surface mirror, where a faint
secondary reflection could be observed coming from the front
surface of the glass.
This is especially critical for 3D viewing; with a conventional
second-surface mirror, the resulting image quality may be
unacceptable.
Tip
Table 3-5. Possible Audio Latency for Various Input Timings
Input Timing Possible Audio Latency (milliseconds)
480i 133
480p 83
576i 160
576p 100
720p/50 100
720p/60 83
1080i/25 160
1080i/30 133
1080p/24 125
1080p/50 80
1080p/60 67