HD3G7 HD 3 Gb/s SDI Video Generator
Cr/R/Z Parameter
This parameter displays one of the three signal components: the C
r
component for
a YC
b
C
r
sample structure, the R component for a GBR sample structure, or the
Z component for an XYZ sample structure. Use the left (
◄
) or right (
►
) arrow
button to set the component to
ON
or
OFF
.
NOTE.
When the sampling structure for the current format uses the YCbCr color
space, the default settings only enable the Y channel. This results in the familiar
black to white zone plate patterns. When the RGB color space is used the default
settings enable all three channels, also resulting in the black to white zone plate
patterns. A colored zone plate pattern can be created by enabling or disabling
individual channels. When the XYZ color space is used, the resultant patterns will
show some chroma in all combinations of the X/Y/Z channel settings, due to the
inherent encoding of this color space.
Waveform Shape
Parameter
Use the Waveform Shape parameter to set the waveform to a Sine, Triangle,
or Square wave.
T Reset Parameter
Use the T Reset parameter to reset the time coordinate (t in the zone plate
equation) of the pattern to zero. When the T Reset parameter is
fi
rst set to
Enable
the time coordinate is reset to zero and there is no apparent motion in the zone
plate, even if any of the time coef
fi
cients (K
XT
, K
YT
, K
T
, or K
T
2
) are non-zero.
Enabling the T Reset parameter does not set the other parameters to zero.
If you then alter any of the K parameters, the temporal (t) coordinate will be
allowed to change to match. Subsequent changes to K parameters will
fi
rst reset
the time coordinate (t), and then allow it to change with the K parameter.
Disable
allows the zone plate time coordinate to increment continuously. When
T Reset is set to
Disable
resetting all of the time coef
fi
cients (K
XT
, K
YT
, K
T
, and
K
T
2
) to zero will stop the apparent zone plate motion but the temporal coordinate
will remain where it is, even if it has moved to an off-screen position. You must
Enable
the T Reset parameter to reset the temporal coordinate to zero.
To completely disable all motion and reset the pattern, set all of the time related K
parameters to zero and set the T Reset parameter to
Enable
.
Using Zone Plate Signals
Here is an example of how you can use zone plate signals to simplify a common
task.
One common task is measuring the horizontal frequency response of a system.
With a typical swept-frequency generator you would apply a signal such as a
1 MHz to 30 MHz sweep with markers every 5 MHz. Then you try to estimate the
frequency of the 3 dB roll-off point by interpolating the position of the 3 dB point
between the markers.
3–160
TG700 TV Signal Generator Platform User Manual
Содержание TG700
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