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152 Chapter 9 Testing HDMI Sink Devices
6. Using the Image knob, select the Ramp image.
The Ramp image appears on the connected HDMI display (as shown below).
7. To verify proper handling of the selected HDMI video format, check for glitches in the
image on the HDMI display.
8. Using the Image knob, select additional images (as desired) to verify proper handling
of the selected HDMI video format.
9. To test another HDMI format, return to step 3.
Testing HDMI video pixel repetition
The EIA/CEA-861-B standard defines a number of progressively-scanned gaming formats
which support variable horizontal resolution. These formats maintain a fixed 2880-pixel
format timing and use pixel repetition to provide 10 different effective horizontal
resolutions. A special blanking scheme further reduces the number of active pixels (to
those listed in the table below), thereby providing a horizontal safe area that insures that
all of the pixels in a game will be visible on overscanned HDMI displays.
To support HDMI gaming format and pixel repetition testing, the generator allows you to
sequentially apply pixel repetition (up to 10 times) to a unique image. As the pixel
repetition factor is increased, the horizontal resolution of the displayed image will decrease
as shown the table below.
Pixel repetition factor
(image version) Horizontal resolution
0 2880 pixels/line
1 2560 pixels/line
2 1280 pixels/line
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