|
One problem faced by many churches using video projection systems is the inability to do a smooth transition between an image from a computer system to an video sent from a DVD or live camera feed. Depending on the age or generation of your projector, this transition may be so involved that it could require executing several on-screen menu commands and result in the projector displaying on-screen flickers, flashes, or rolling bars until the image has re-synced. This is distracting to the viewer, and is certainly not considered technical excellence.
The native resolution of most video projectors 1024 x 768 (SXGA) (this is the number pixels or little dots which make the picture you see). When you connect your laptop or computer you should set the output to 1024 x 768(or the native resolution of the projector). The problem now comes when you want to run a DVD or camera or other video signal. When you switch the input on the projector this now has to first see what type of signal it is and then it has to increase and change the resolution of signal to match its native input. Now this takes time and this where you get the time delay between switching. In some installations the computer signal is connected to a down converter and then to a video mixer or switch. This has two problems first the signal quality is reduced, images appear fuzzy and less well defined. Second the projector now has to scale the signal up to its native resolution 1024 x 768. In the process a lot of signal quality is lost.
The switcher/scaler overcomes this problem by having an output which matches the native resolution of the projector. So all video signals, computer, DVD, camera etc. are scaled up to this native resolution. This first saves the projector from having to scale the input, second you get the best video quality. Thirdly the whole operation becomes as easy as pressing a button to switch between the inputs. This make the whole operation easier, more professional and most importantly anyone can use it.
The diagram below shows a typical unit and connections - the output shown is going to a plasma but this could a projector, VGA splitter feeding plasmas, LCD monitors and projectors.
|
