Audio/Video Synchronization Issues - Runco Signature Cinema SC-30d Installation & Operation Manual

For best performance, always use "first-surface" mirrors in your
Tip
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.
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.
Table 3-5. Possible Audio Latency for Various Input Timings
Input Timing
480i
480p
576i
576p
720p/50
720p/60
1080i/25
1080i/30
1080p/24
1080p/50
1080p/60
Runco SC-30d/SC-35d Installation/Operation Manual
Possible Audio Latency (milliseconds)
133
83
160
100
100
83
160
133
125
80
67
27
Installation
Audio/Video
Synchronization Issues