X75HD/X75SD Installation and Operation Manual 77
Chapter 4: System Installation and Connections
To trigger external devices, use the two RCA-jack GPI outputs provided
on the Multi I/O breakout cable. Configure the functionality of this
output by navigating to System Config>Setup>GPO Output.
SD Audio Delay Output
This BNC connector provides the varying width TTL pulse that is
directly proportional to input-to-output propagation delay of the
selected SDTV signal path. Some external audio synchronizer devices
can use this pulse signal to auto-synchronize the audio signal to the
video.
HD Audio Delay Output
This BNC connector provides the varying width TTL pulse that is a
direct output from the HDTV frame synchronizer output. The pulse
width is directly proportional to the frame synchronizer's
input-to-output propagation delay. Some external audio synchronizer
devices can use this pulse signal to auto-synchronize the audio signal to
the video.
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