Operation, cont’d
ISS 506 Integration Seamless Switcher • Operation
3-10
These lines appear as fuzzy vertical bars when an alternating pixels pattern is
applied. When the total pixels setting is improperly adjusted, the entire image can
have a noisy or darkened appearance. Adjusting the phase corrects this.
As an approximate setting, multiply the active pixels setting (see “Active Pixels and
Active Lines submenus”, below) by a factor of 1.3.
If the input pixel clock rate is known, the input total pixels setting can be calculated
with this equation: total pixels = input pixels clock ÷ input horizontal scan rate.
Once a preliminary setting is saved, some faint vertical lines may remain. Adjust
the total pixels variable as necessary until the lines are completely out of view or
as far apart as you can make them. If one line remains, it can be moved out of
view using the Phase submenu (see “Preview and Program Phase submenus” on
page 3-9).
N
The active pixels and total pixels adjustments are interactive. Setting one of
these variables may require adjusting the other.
Active Pixels and Active Lines submenus
Two submenus define the active (image) area of the input (figure 3-7):
• Active pixels — The number of pixels per line that are inside the input active
area. The baseline for the active pixels adjustment is the right edge of the
image. This value is often referred to as “horizontal resolution”.
• Active lines — The number of lines per frame that are inside the input active
area. The baseline for the active lines adjustment is the bottom edge of the
image. This value is often referred to as “vertical resolution”.
For interlaced input signals, this variable refers to the total number of lines
per frame after de-interlacing, not the number of lines per field.
Active Pixels
Active
Lines
Incorrect Active Area
Active Area
Blanking Area
Figure 3-7 — Incorrect active area setting
Select the desired submenu. Rotate the Adjust [ knob while the Input format
submenu is active to select an input to configure. Rotate the Adjust { knob to set
the Active Pixels or Active Lines variable.
