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1. User Interface

VI. SYNC SEPARATOR AND SYNC MIXER

The key to a stable picture is a good sync signal. The mixing,

attenuation and distortion of video signals can deteriorate sync, leading to

horizontal or vertical scrolling of video on screen. When the lost of sync

is undesired by the user, the sync separator and sync mixer can come

into play.

The sync separator, based on the LM1881, extracts the sync portion

of the video signal. The sync mixer then takes a distorted video signal

and remixes it with the sync provided by the sync separator, resulting in

a stable image.

Instead of restoring the sync of a video signal, the user can also

sync, for example, video source A with video source B's sync, resulting

in a slow horizontal and vertical scrolling of video source A.

A two-stage low pass filter, switchable through the DIP switch, is

also built into the Sync Mixer, enabling user to create a ghostly effect.

To improve stability and compatibility with cameras and monitors, a

switchable input and output impedance of 75

PCB.

is available on the main