
Installation
D-73d Series Installation/Operation Manual 29
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.
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
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