1Introduction

Television (TV) has undergone a lot of important milestones throughout the years of its evolution starting with a primitive mechanical television (1884) through electronic analog televisions to digital television. Origins of the mechanical television can be found when a Nipkow disc was invented and patented. This mechanical disc was spinning and via small holes the images were scanned and on the other end displayed on a small screen. There were also commercial home TV sets (Octagon, Baird models) but this primitive television was only interested for “curious” customers.

The electronic television was able to evolve when a cathode-ray tube (CRT) was developed [1]. It utilizes an electron beam that creates image on a fluorescent surface of screen (line by line). First electronic television was analog and black and white and in the 1950s color television started to appear. A significant boom in a television production happened after Second World War in the United States when number of households with TV sets dramatically increased. For analog (or analogue) television three encoding systems have been developed – NTSC, PAL and SECAM. European countries adopted PAL/SECAM systems. Broadcasters have been distributing the analog television via a set of channels within very high and ultra-high frequency bands - one television channel per one carrier (channel) frequency.

In 1980s it was possible to broadcast analog video with digital audio signals but a conversion from analog to digital television required efficient coding algorithms and high performance processors. With invention of MPEG compression algorithms in the beginning of the 1990s digital television gained an open highway for its realization and standardization. Currently, digital television is broadcasted via cable, air and satellite in standard and high definition resolutions. Rapid progress in information and communication technologies changed ordinary TV sets to smart TVs which are equipped by the broadband connection. This capability brings end users a lot of other applications as well as access to IPTV services [2].

Actual efforts are focused on a development of hybrid digital television. In 2009 HbbTV (Hybrid Broadcast Broadband TV) consortium came into being with the main objective to combine broadcast, broadband and IPTV services to deliver entertainment to users via their end devices (TVs, set-top-boxes).

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Fig. 1 - Evolution of TV sets