default capture rate to the specified input frequency. It then maintains the aspect ratio based on the difference between the input active area and the output resolution (active area) by inserting blank borders around the images. If, however, you want to fill the entire monitor, you can adjust the input aspect ratio by slightly changing the number of active pixels and active lines to stretch the image. You may also need to adjust the number of total pixels.

Adjust the Active Pixels status indicator bar to increase and decrease the number of active pixels, shifting the starting period horizontally on the screen. Adjust the Active Lines status indicator bar to increase and decrease the number of lines.

Active pixels

Active lines

Aspect ratio

Total pixels

Comment

 

Horizontal rate = 31.5 kHz, vertical rate 60 Hz

640

480

4:3

780

Progressive NTSC

 

 

 

 

 

640

350

64:35

800

 

 

 

 

 

 

640

400

8:5

800

 

 

 

 

 

 

640

480

4:3

800

Factory default

 

 

 

 

 

720

350

72:35

900

 

 

 

 

 

 

720

400

9:5

900

 

 

Horizontal rate = 15.7 kHz, vertical rate 60 Hz

768

480

8:5

910

NTSC 14.3

720

480

3:2

858

NTSC 13.5

 

 

 

 

 

640

480

4:3

780

NTSC 12.3 (default)

 

 

 

 

 

IN1508 Scaling Presentation Switcher • Operation 3-37

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Extron electronic IN1508 manual Horizontal rate = 31.5 kHz, vertical rate 60 Hz