Sound and Communications - July 2008 Issue

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tions will involve a subset of the largesystems’ needs.Within the high-end signage solution,there are three major elements:video content (often shown within awindow on the screen), graphics andtext, and signage control. Althougheach element requires careful consideration,our focus here is on the videocontent and control aspect, becausethe graphics and text are primarily acreative function, and not typically addressedby the integrator.Source SelectionIn any system, each player has oneto four video inputs, so any video elementsthat are to be part of the signagesolution can be input into theplayer. Because the player does therendering, each player must be ableto accept signals from video sources,such as set-top boxes, DVD players orPCs with stored content.Of course, as the scale of this type ofdeployment grows, it is evident that, inaddition to the players, you also needto implement a video switching anddistribution system. This allows youFigure 1. Video-based signage solution.Figure 2. High-end digital signage.( )44Sound & Communicationswww.soundandcommunications.com
to locate the video sourcessomewhere within the facility,but avoids having to duplicatethe video source at each player.Of course, once the videosources have been placed,they will have to be controlled.Each will have to be accessibleso the content can be switchedbased on the signage channelthat is being played.However, the content likelywill be formatted in differentresolutions and connected tothe video distribution systemin different ways. For example,the DVD players might be connectedvia component cabling,whereas the PCs are connectedvia a VGA cable. This adds theadditional complexity of transcodingor scaling the contentso it is input into the signageplayers appropriately. We callthis The Video Source SelectionChallenge. One solution toCManaged SwitchFigure 3. Solving the Source Selection Challenge.DisplaysJuly 2008 45
Page 1: Vol. 54 No. 7July 21, 2008Beauty of
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Page 6 and 7: Standing in front of an exhibit, st
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