The increasing sophistication of TV and video equipment (reflected in earlier chapters of this book) and its interactive nature has necessitated the development of control systems which are largely automatic in operation. They devolve into three broad groups: user-control of equipment function; equipment-internal management of data and commands; and inter-equipment links, in which the operation of associated units is co-ordinated by ‘command’ links between them.

The most tangible and familiar of these is the cordless remote control handset by which much modern consumer entertainment equipment is ‘driven’. The serial data link takes the form of an infra-red (IR) transmission, in which the carrier is a beam of light ...

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