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Program delivery to mobile devices and smart televisions has fueled the growth for internet delivery. But one of the challenges broadcasters and media content providers face is that the internet was never originally designed to stream large amounts of video and audio with virtually no dropout or latency.
Monitoring has always been the engineers’ best friend as it turns apparent chaos into order and helps us understand what is going on deep inside a system to deliver high-quality pictures and sound. As OTT continues to play a more prominent role, the need to monitor internet distribution systems is becoming increasingly compelling.
The CRC (cyclic redundancy check) was primarily an error detector, but it did allow some early error correction systems to be implemented.
There are many different CRCs but they all work in much the same way, which is that the data to be protected are divided by the CRC polynomial. This was done serially by shifting the data bits into the CRC generator at the same time as they were being written to a medium such as disk or tape or sent into a serial transmission line.
For many years broadcasters have been working with static systems that are difficult to change and upgrade. Although we have video and audio routing, the often-tangled mess of jackfield patch-cords is testament to how flexible broadcast systems really need to be to meet the demands of modern program making.
SDI is one of those technologies that is so well established and ubiquitous it can almost be taken for granted.
TV stations refocus their creative talents and energies on staying healthy and on the air.
The mathematics of finite fields and sequences seems to be a long way from everyday life, but it happens in the background every time we use a computer and without it, an explanation of modern error correction cannot be given.