DLV1280-DX User Manual - Christie Digital Systems

OPERATIONPixel Phase(SHORT CUT: Press Pixel and adjust the bottom slidebar.)Pixel phase adjusts the phase of the pixel sampling clock relative to the incomingsignal. It is used primarily for adjusting RGB inputs.NOTE: Adjust pixel phase after pixel tracking is properly set.Adjust pixel phase when the image (usually from an RGB source) shows shimmer or“noise”. Pixel phase adjustment is done most effectively from within a proper testpattern, such as a smooth gray consisting of a clear pattern of tiny black and whitedots, or a similar graphic image, such as the Windows shutdown screen. Adjust untilthe image is stable and each dot is clearly defined. Using the numbers on the slidebaras a guide, you will notice that you can actually stabilize the image at more than onepoint—i.e., you may find that the image appearance at "11" is identical to the imageappearance at "38", thus you can select either setting.If, after properly adjusting both pixel tracking and phase, the image still appears“noisy”, adjust Filter as described below.FilterThis option applies a low pass filter to the input signal. Filter removes highfrequencies which can improve pixel phase noise but which also reduces signalbandwidth. Note that most signals will not require any filter adjustment—use thefilter option only if standard pixel tracking and phase adjustments do not adequatelyclear up a “noisy” signal. For best results:1. Optimize Pixel Tracking and jot down thevalue.2. Optimize Pixel Phase3. If the image is still too noisy, return to PixelTracking and “mis-adjust” so that 2 verticalbands of noise appear, separated by a goodcenter band. See right.4. Adjust Filter to maximize the width of the goodarea. See right.5. Return Pixel Tracking to its correct setting fromStep 1.6. Readjust Phase.NOTE: “Filter” affects only the current signal.H-Position(SHORT CUT: Press Position and adjust the top slidebar.)This option moves image right or left.NOTE: The value shown represents where the approximate center of the image lies inrelation to the total number of pixels available horizontally. This varies widelyaccording to the signal—watch the image while adjusting.DLV1280 DX User’s Manual 3-25