Standard Handbook of Video and Television Engineering, 4th Edition

The distinction between a video system intended for production applications and a system intended for the transmission of image and sounds is an important one. Because of their closed-loop characteristics, production systems can be of any practical design. The process of developing a production system can focus simply on those who will directly use the system. It is not necessary to consider the larger issues of compatibility and public policy, which drive the design and implementation of over-the-air broadcast systems.
Although the foregoing is certainly correct, in the abstract, it is obvious that the economies of scale argue in favor of the development of a production system even if only closed-loop that meets multiple applications. The benefits of expanded markets and interoperability between systems are well documented. It was into this environment that production systems intended for...