Lesson 2
DESCRIBE THE COLOR BAR TEST SIGNALS
TASK
Describe and identify the four basic color bar test signals.
CONDITIONS
Given information and illustrations relating to the four basic color bar test
signals.
STANDARDS
Demonstrate competency of task skills and knowledge required for identification of
the color bars signals discussed in this lesson by correctly responding to 80
percent of the multiple-choice test questions covering the four basic color bar
test signals.
REFERENCES
None
Learning Event 1:
DESCRIBE THE ENCODED COLOR BARS TEST SIGNAL
1. The encoded color bars signal.
The Electronics Industries Association (EIA)
standard for the encoded color bars signal is established in their recommended
standard RS-189.
RS-189 provides the specification of the encoded color bars
signal and its various applications. Some of the most common uses of this signal
involve rapid checks of television transmitters, performing timing checks of
production switchers, leader reference signals on video tapes, and to serve as a
calibration signal for the adjustment of color monitors and encoders.
2. The encoded color bars signal consists of two major parts.
The first three-
fourths of the active scanning lines in each field are divided into seven equal
intervals.
These intervals represent one luminance interval and six chrominance
intervals. The intervals are arranged in descending order of luminance from left
to right as you observe a picture monitor or waveform monitor (fig 2-1).
a. The first interval, Gray (TV White), not to be confused with peak
or
reference white, has a luminance level of +77 IRE.
This luminance level
is
normally associated with nonmodulated
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