30 September 1988
VIDEO SIGNAL TIMING
Describe timing system designs which use delays, synchronizing generators,
and multiple studio timing.
Given information on timing requirements of the video signal.
Demonstrate competency of the task skills and knowledge by correctly
responding to at least 80 percent of the multiple-choice test covering the
components of video signal timing requirements.
Before the actual assembly of a teleproduction facility can begin, a system
plan must be completed. This can only be accomplished when studio timing
requirements are defined. It is necessary to know the timing requirements
of the equipment to be installed.
This information is usually available
from the manufacturer's specifications manual. Most newer source equipment
locks to color black.
This implies the device has its own internal sync
generator. Typically, this source equipment will have adjustments to allow
the video output timing to be adjusted relative to the reference color
black. You should verify that the adjustment range is sufficient for your
Learning Event 1:
DESCRIBE THE COMPONENTS USED FOR MULTIPLE SYSTEM TIMING
The ability to "lock-to-color-black" has not always existed.
early years of television, cameras needed separate horizontal and vertical
"drive pulses" from the sync generator to drive their scanning circuits.
Sync, blanking, and subcarrier also were needed.
System design required
that all drive pulses be advanced by the path length of the camera.
delay from pulse input to video output may have been as long as one
microsecond (a very long delay).