DVDO VP50 owner manual Sync Type, Output Level, Framerate Conversion

A video projector can also be used in conjunction with an anamorphic lens. An anamorphic lens allows the user to focus the maximum resolution and brightness into a specified area, either 16:9 or 2.35:1. The most common configuration is a constant image height (CIH) system with a 16:9 projector, an anamorphic lens and a 2.35:1 screen. In this configuration, the anamorphic lens can either be fixed or motorized. If the lens is fixed then the proper ‘Lens’ mode is ‘Mode 1’ when the content has a 2.35:1 aspect ratio, or higher, and ‘Mode 2’ is for content that has an aspect ratio less than 2.35:1.

Panamorph “Lens” modes defined:

Mode 1: Content is displayed by the projector vertically stretched by 33%.

Mode 2: Content is horizontally squeezed by 25%. This mode is necessary for fixed-lens applications with 16:9 projector/2.35:1 screen and 4:3 projector/16:9 screen configurations.

In a CIH system with a motorized lens, it should only be used when the input content has a 2.35:1, or higher, aspect ratio. The proper mode to use with a motorized anamorphic lens is ‘Mode 1 – Auto’. In this mode, the proper ‘Lens’ mode is automatically selected based upon the selected Active AR on the input. If the Active AR is 2.35:1 or above, “Mode 1” is activated, if the Active AR is below 2.35:1, “None” is selected. With this mode selected, the ‘Display’ and ‘Screen’ options will also be grayed out. If the motorized anamorphic lens also has a 12V trigger, it can be automated by connecting to Trigger #2 on the back panel, and setting the ‘Output Setup _Trigger 2’ setting to ‘Lens’.

When the Display Aspect Ratio is not the same as Active Output Aspect Ratio and the Lens mode is set to ‘None’, the mask is set to blanking levels and always centers the position of the active area over the display area. Image shift allows you to adjust the location of the image on your screen both horizon- tally and vertically when the ‘Screen’ aspect ratio is not equal to the ‘Display’ aspect ratio. The example below shows 16:9 projector (1.78:1) and a 2.35:1 screen, you can shift the image to match the exact location of your screen. In this situation, the image is shifted down putting all of the mask at the top of the projected image.

Sync Type

The Sync Type option sets the synchronization signal type of the output format. Press the P or Q button to show the current sync type. Press the same button again to move to the next sync type. Currently, the iScan supports seven sync types:

•Bi-levelbi-level sync on green/luma

•Tri-leveltri-level sync on green/luma

•CSync Composite Sync (on the H sync BNC connector)

•H+V+ Positive Hsync and Positive Vsync

•H+V- Positive Hsync and Negative Vsync

•H-V+Negative Hsync and Positive Vsync

•H-V-Negative Hsync and Negative Vsync

Color Space

The color space parameter sets the color space of the output format. Press the Enter or ? button to show the current color space. Press the same button again to select the alternate color space. Two analog color space options are supported: YPbPr (default) and RGB. Two digital color space options are supported: RGB (default) and YCbCr (both 4:2:2 and 4:4:4).

Output Level

The output level setting allows the user to specify the levels of the output signal, either Video (16-235) or PC (0-255).

Framerate Conversion

This parameter enables frame rate conversion. There are four sets of controls, one for 24Hz input sources, one for 25Hz input sources, one for 50Hz input sources and one for 60Hz input sources.

For 24Hz sources, the output frame rate can be 24Hz, 48Hz or 60Hz, which allows the user to view 24Hz content on a 60Hz display. For 24Hz sources the output can also be unlocked to 50Hz so that this content can also be viewed on a 50Hz display.

Screen Aspect Ratio	Mask
(2.35:1)

Screen Aspect Ratio

(2.35:1)

For 50Hz sources, the output frame rate can be either 50Hz or unlocked at 60Hz, which allows the user to view PAL/SECAM content on an NTSC display. For 60Hz sources, the output frame rate can be either 60Hz or unlocked at 50Hz, which allows the user to view NTSC content on a PAL/SECAM display.

First of all, note that there are separate settings for 60 Hz sources and 50 Hz sources. This allows you, for instance, to configure the iScan’s output to behave differently with NTSC and PAL sources. One potential advantage of this is that if you have a display which only works at a single frame rate

Underscan represents the visible display area, a sub-set of the Active Output Area. Underscan is like a negative zoom which preserves the aspect ratio of the active area. The default for this setting is 0. As you increase underscan, the smaller portion of the active display area appears while preserving the aspect ratio of the active display area. The Frame Geometry Test pattern should be used while making this adjustment.

	Image
Active	Visible Area
Output

—say, 60 Hz — that you can have the iScan run in locked mode (see below) for 60 Hz sources while applying 50Hz to 60Hz frame rate conversion for all 50Hz sources.

Locked mode (1:1): This means that the iScan’s output frame rate tracks the input rate — i.e., the output rate is locked to the input rate. In the 1:1 mode — i.e., 60 Hz source-locked to 60 Hz, and 50 Hz source-locked to 50 Hz — there is always exactly one output frame for every input frame/ field. This mode has the advantage that there are never any dropped or repeated frames (unless the source itself does this). One disadvantage of this mode is that when the video source is changed, the iScan has to re-lock to the new input signal timing. This causes a disruption in the iScan’s output signal while the locking process occurs, and can cause many displays to loose sync to the iScan’s signal and temporarily blank.

Unlocked mode: This means that the iScan’s output frame rate is independent of the input rate. Regardless of any variations in the input, the output frame rate will be fixed at the specified value. This mode results in the most stable output signal as it’s independent of any changes in the input

29 30