30 September 1988
THE BASIC VIDEO SIGNAL
Describe the basic application of the video signals in television studios
and the relationship to studio timing.
Given information and illustrations relating to studio timing procedures.
Demonstrate competency of the task skills and knowledge by correctly
responding to at least 80 percent of the multiple-choice test covering the
principles of the video signal and the interconnection of studio equipment.
Learning Event 1:
DESCRIBE THE PRINCIPLES OF THE VIDEO SIGNAL
Light from a scene enters the studio camera through the lens and
creates a pattern of electrical charges on the pickup tube's target.
electron beam scans across the target and completes an electrical circuit
with the pattern of electrical charges on the tube target.
representing the scene in different degrees of lightness or darkness flow
from the target and become the video signal. In this way, the pickup tube
inside the camera changes the varying brightness of light that it "sees"
into varying electrical voltages called video (fig 1-1).
Varying video signal