Sound and Communications - July 2008 Issue

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Figure 4. Complete implementation of high-end digital signage.DecoderEncoderEncoderDecoderEncoder17 UCentrally located signageplayers with Decoders todistribute video sources,Use Encoders to distributerendered contentDisplaysThe Video Source Selection Challenge,as shown in Figure 3, is to use an IPbasedmultimedia encoder and decoderto handle switching of sources,controlling the sources and displays,and outputting content appropriatelybetween VGA and component.Video DistributionOnce you’ve addressed The VideoSource Selection Challenge, we nextlook at how to distribute the final renderedvideo content. There are twotypical models here, with the scopeand scale of the job dictating whichmodel is best. The first model is whereeach player is placed next to, or mountedbehind, the displays. This model isused when each display has its ownunique content, for example, interactivesignage displays.The second model is where a limitednumber of signage channels isdistributed to multiple displays. Forinstance, you might have five digitalsignage channels distributed to 50 dis-46 Sound & Communicationswww.soundandcommunications.com
plays. Putting signage players, whichtend to be high-end PCs, behind eachdisplay might not be practical. Additionally,if the players are the primaryvideo source for the display, you losethe ability to use the displays for otherpurposes without additional video distributioninfrastructure.To illustrate, we can take a look ata recent corporate customer that notonly needed a signage solution foremployee communication, but alsoused the same displays for satellite TVdistribution throughout its facility. Ifthe corporate customer had only usedplayers as sources, it would have acompletely separate video distributionand satellite TV control solution foreach display. Either that, or it wouldhave required multiple boxes behindeach display...a messy and troublepronesolution.Instead, the corporate customeropted for a single solution that coulddistribute and control the satellite TVwhile, at the same time, distributingany signage when needed. This is theIP-based multimedia distribution solutionshown in Figure 3. This solutionalso ensures that both the audio andvideo at each display, as well as acrossall displays, are synchronized to below1ms. This means that, in a largescaleimplementation, you don’t haveto worry about content playing out ofsync from one zone to the next.1 gigabit per second of network traffic.Some lesser-based IP solutions willcompress the video to approximately 8megabits per second using MPEG2, 4or H.264 video codecs. That is a 125:1compression ratio, resulting in a lot oflost detail.Is 1 gigabit per second practical?The short answer is, yes. Networkswitching technology allows us totake full advantage of the Cat5 orCat5e cable that runs to the displayand delivers the highest quality videoto that display. This can be done overWUXGAat 2000’/610m*over CatX–clearer, farther –you get the picture!a managed switch so no other networktraffic is impacted. In some cases, qualitymight not matter but, in almost allscenarios that we have seen, givenprice/performance tradeoff betweenvarious IP-based solutions, end userswill almost always select the high performance/qualitysolution with a pricepoint similar to that of the compressedvideo solutions.For many, there is the question ofwhether a compromise is possible onbandwidth. This is of particular concernwhere there might be a sharedIP-Based VideoThe next step is to address the qualityof video that you want in your solution.Although there are many ways todistribute video around a facility, thenewest and most efficient are TCP/IP-based solutions. The benefits of IPare many: You can scale the solutionas large as you want, you can controlthe solution from any point on the network,you get to leverage the client’sexisting network infrastructure investmentand you can combine controlwith the video signal distribution.However, it must be noted that notall IP-based solutions are createdequal: Some significantly compressthe video to fit within the network.For example, a high-definition videosignal (1080i) uncompressed is aboutBlowing the doorsoff the competition!Magenta’s new MultiView XR-2000 extends the rangeand resolution of video-over-CatX to an unprecedented1920x1200 AT (not “UP TO”) 2,000 feet (610 meters)!Unlike other video-over-Cat5 products, the MultiViewSeries is fully compatible with 1080p and today’s highestresolution projectors. skew correction allows the use of many standard CatX cables optionfor bi-directional display communication minimizing transmitter costDon’t need 2,000 feet? Going multipoint tomultipoint? Magenta offers the widest rangeof CatX receivers, transmitters, switches anddistribution methods. One product line...hundreds of adaptations for digital signage.*One continuous cable run, no repeaters!Magenta ResearchPhone: 860-210-0546sales@magenta-research.comwww.magenta-research.comCONNECT WITHCONFIDENCE SM10 Years of Excellence.12102_ multiviewfinal_ sound&com.indd 1 1/18/08 12:06:23 PMJuly 2008 47
Page 1: Vol. 54 No. 7July 21, 2008Beauty of
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Page 6 and 7: Standing in front of an exhibit, st
Page 8: EXPERIENCE MORE .: INNOVATION :.Thi
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Page 39 and 40: EquipmentKen NewburyRear-Projection
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Page 43 and 44: ing sectors for dollars spent. As m
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Page 49 and 50: this month onThe industry’s first
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