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All the bolt on bits of equipment ... | ||||||||||||||||||||||||||||||
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This particular piece of kit is by modern standards now almost totally redundant. In the comfort of our ‘digital’ age, most signal processing is now done ‘in the box’, so the need for an accurately syncronised array of equipment, is in most situations, significantly less important than it used to be. Anyhow, the SPG or ‘Genlock’ unit is basically a specialist signal generator which provides the external syncronising signals that allow any number of (external sync. capable) cameras, to start sampling images at precisely the same time (if you like, they are all made to sing from the same hymn sheet .... and in harmony!). By connecting all the cameras up with a seperate sync. cable, the driving signals are generated by the SPG, and in much larger installations, distributed to the cameras using a Pulse Distribution Amplifer (PDA). The benefit of using this additional equipment, is that older type switching systems (and indeed Screen Splitters) could 'lock on' to the cameras signal without any unwanted side effects, such as rolling pictures (bounce), or tearing in the displayed image. Again it must be stated, this is really an historical convention, and in the modern CCTV world this type of equipment is now pretty much a thing of the past.
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