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from yellow to orange, red, blue and ending in green. 'l'his method of pro
ducing the color signals is called off-set sub-carrier operation.
By referring to Fig. 18 you will see the vector display of the color infor
mation that can be obtained for a phase shift of any given number of degrees.
For example, 60
°
represents a + (I) signal. A 90
°
phase shift represents
+
(R-Y). 180
°
represents + (B-Y) and a +300
°
represents (G-Y). In
order to change a color rainbow signal to a color bar signal, we merely have
to blank out those portions of the rainbow display that we do not want and
BAR N.2.3
BRIGHT RED
T
9
o•
a:
+
-1?
8
.q�
%
'1<, �:.,
'1
J,
120
°
T--
0�_-_B_-_v ___ � ___ "-* __.B_-v_180•
f±l ��:
[__:JsLUE
HORIZONTAL
BLANKING
INTERVAL
,..o.
�
a:
I
210•
BAR Nl!.9
BLU1�4-GREEN
Figure 18--Vector display showing color bars and angular displacement for each bar
allow the portion of the rainbow that we do want to come through. This we
accomplish with the color bar slide enclosed in your accessory package. You
will note that there are ten light intervals and nine dark intervals equally
spaced on the slide. Each bright interval, or bar, represents a color phase shift
of 30
°
and is so placed on the slide as to give the colors as indicated in Fig.
19. You will note for example in Fig. 19 that the second bar is indicated as
orange and its color corresponds to
+
(I) since it is 60
°
from the reference
signal. The sixth bar for example, is a blue color and corresponds to
+
(B-Y)
34
Содержание 1076
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