Operation, cont’d
To change the output aspect ratio of most DVD players:
1.Enter the DVD player’s setup or action menu while the disc is stopped.
2.Select the 16:9 aspect ratio.
Resolution and refresh rates
Resolution and refresh rate are probably the most crucial variables for optimum image quality. Every display has an optimal or native resolution and an optimal refresh rate. These will vary, depending on:
•The type of display technology
•Whether the display has a fixed number of pixels (a native resolution)
•The size of the pixels
•The size of the display or screen
•The distance of the viewer from the screen.
For best results, set the scaler’s output resolution and refresh rate to match the capabilities of your display.
The ideal resolution must lie within the compatible range of the display. For example, some 27” to 36” presentation monitors are limited to input signals in the 30 hKz to 50 kHz range. Check the Direct View Display Cross Reference and the Projector Cross Reference in the Extron catalog or on the Extron web site (www.extron.com) for the most
CRT displays — selecting the optimum resolution
While CRT displays do not have a native resolution, they do have a “sweet spot“ for input signal resolution. When the scaler is set to output at the sweet spot of the CRT, it results in a detailed image with no visible scan lines. If the scaler is set to output below the sweet spot, the displayed image has small scan lines between the image lines. If the scaler is set to output above the sweet spot, the images lines overlap and the image loses detail because there are more lines and pixels than the display can clearly resolve. When experimenting to find the sweet spot, start with the output refresh rate set at 72 Hz and the resolution shown in the table on the next page. Then, with a critical eye, try higher and lower resolutions until you achieve a solid image with optimum image detail.
CRT displays — selecting the optimum refresh rate
CRTs tend to flicker at refresh rates below 70 Hz. To achieve a
Note that as the refresh rate increases, the horizontal scan rate also increases, placing greater bandwidth demands on the video distribution system and the display. If the bandwidth is too high, you may see a softer image because the signal exceeds the bandwidth of the distribution system and the display. An extremely high refresh rate can also create a compatibility problem in which the video signal is beyond the scan rate of the display.
