HD3G7 HD 3 Gb/s SDI Video Generator
K
XY
Parameter
Display name:
KXY (V Ch. H Freq.)
Units:
c/aph per active picture height (c/aph
2
)
The K
XY
(V Ch. H Freq.) parameter sets the change in horizontal frequency
as a function of the vertical position in the video frame. To see the effects of
this parameter, set the waveform monitor to view one selected line only. Then,
with K
XY
set to approximately 25 (all other coef
fi
cients left at 0.0), look at line
waveforms from top to bottom of the frame. The horizontal frequency increases
slightly on each succeeding line, reaching 25 c/aph on the last line of active video.
The result can be thought of as a vertically arranged “sweep” signal.
K
Y
Parameter
Display name:
KY (V Freq.)
Units:
cycles per active picture height (c/aph)
The K
Y
(V Freq.) parameter sets the initial
vertical
frequency of the pattern (it is
analogous to K
X
rotated 90° clockwise). To see the effects of this parameter, set
it to a low number and adjust a waveform monitor to view one or two
fi
elds of
the HD3G7 output. The variation in the (dc) voltage level from line to line will
give the
fi
eld waveform the appearance of a sampled sine wave, especially at a
K
Y
of around 5 to 10 c/aph (the sinusoid can become dif
fi
cult to discern at higher
frequencies). Note that in the Y (vertical) parameters, the c/aph units translate
directly into visible cycles down the frame.
The Vertical Sine zone plate is a “K
Y
-only” zone plate. (See Figure 3-79.)
Figure 3-79: A “K
Y
-only” zone plate
K
Y
2
Parameter
Display name:
KY^2 (V Sweep).
Units:
c/aph per active picture height (c/aph
2
)
The K
Y
2
(V Sweep) parameter sets the increase (or decrease) in vertical frequency
down the frame. (K
Y
2
compares to K
X
2
as K
Y
compares to K
X
.) Again, a good way
to see the effect of K
Y
2
is to view the
fi
eld on a waveform monitor. With KY set to
0.0, a K
Y
2
coef
fi
cient of 10 will result in the apparent vertical sine wave changing
from DC to 10 c/aph from the top of the picture to the bottom.
To center the “DC point” at mid-screen, set K
Y
2
to –2 times K
Y
.
TG700 TV Signal Generator Platform User Manual
3–157
Summary of Contents for TG700
Page 1: ...xx TG700 TV Signal Generator Platform ZZZ User Manual P071197003 071 1970 03...
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Page 67: ...Operating Basics...
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