C2-4000 Series RGB Scaler Operation Manual
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16.4
Lines per Frame
This screen controls the total number of lines of video present in the image
and includes the vertical Sync pulse as well as the active video.
Adjustment is made by rotating the Menu Select knob until the above screen
is visible and then pressing the Menu Select knob. The brackets will flash and
you can make your adjustment as desired. Press the Menu Select knob a
second time to record your new value.
16.5
H/V Active
A Video frame includes both the active area (the portion of the image normally
containing useful visual information) as well as the area occupied by the
Vertical and Horizontal synchronizing pulses. A resolution value for a given
display standard only expresses the number of pixels visible in an image. The
well known 800 X 600 computer resolution standard simply means that there
are 800 pixels/line visible horizontally and there are 600 pixels/line visible
vertically.
The H/V active LCD screen provides a way to change the number of pixels
and lines. When parked on the above screen, press the Menu Select knob
and the brackets surrounding the Horizontal value will begin to flash. Make
your adjustment and press the knob again. The value will be recorded and the
flashing will cease. Rotate the Menu Select knob one detent to the right and
press the knob again. The brackets will be repositioned and you can now
adjust the Vertical value. Press the knob once more to record your new value.
16.6
H/V Start
There is a period of time between the end of a Horizontal Sync pulse and the
start of Active Video. This portion of the waveform signal is called the “Back
Porch”, a term originating with the television broadcasting industry and its RS-
170A specification. In practice, this will control where the video image starts
on the left side of the monitor without changing the width of the sync pulse
itself (another way to control where the image area starts).
By adjusting this parameter, you can control the start of the back porch (with
respect to the trailing edge of Horizontal Sync) and also its width. The place
where the Back Porch begins with respect to the Horizontal Sync pulse and
800 x 600 60 Hz
Lines/f [ 628] = 60.317 hz
800 x 600 60 Hz
H/V active [ 800] x 600
800 x 600 60 Hz
H/V Start [ 88] x 23
Summary of Contents for C2-4000 Series
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