Installation
20
PlasmaWall XP Series Installation/Operation Manual
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Audio/Video
Synchronization Issues
Due to its extraordinarily high level of video processing performance, the DHD Controller
may distribute video signals with a perceptible level of audio latency. In order to easily
solve this issue, Runco recommends using the DHD 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 A/V receivers introduce additional latency that needs to be
compensated for during the installation. Table 3-2 shows the amount of possible audio
latency given different signal input timings.
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Table 3-2. Possible Audio Latency for Various Input/Output 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
