Nowadays, digital television is getting wide-spread, and replacing analog television more and more widely. It has many advantages over analog television, like better picture quality, higher number of channels transmitted with the same bandwidth, but one of the most important is the opportunity of implementing interactive services.
These new services require interactivity from users therefore it’s necessary to provide a two way communication channel between the subscriber and the service provider. The easiest way to implement such communication is to use an IP network. The service implemented by combining IP networks and broadcasting in the same time is called Hybrid Television Service.
My first task to achieve in my diploma work was to get better knowledge of digital television standards which are used in Europe (DVB standard family), the most important video coding standards (MPEG), and finally the HbbTV standard as a standardized example of Hybrid TV and to summarize their main points.
The implementation of interactive services raises a new challenge to service providers: they should identify and manage subscribers and their terminals one by one, in order to be able to keep track of the usage of services like interactive applications or VOD. Without this billing could not be done accurately.
My second task was to create a logical AREA on a hybrid test system, add users, terminals and content; to test possible solutions for categorizing, separating subscribers and to analyze the rights of subscriber groups to access services.
My last task was to give an overview of the possibilities to implement the Hybrid Television Service if the DVB-S is substituted with DVB-C network. In the last part of my diploma work I also show some examples about the possible future and evolution of Digital Cable Television.