Converter box enables DTV for analogue sets

What is DTV?
DTV (digital TV) is a telecommunication system for broadcasting and receiving moving pictures and sound by means of digital signals, in contrast to analog signals used by traditional TV. DTV uses digital modulation data, which is digitally compressed and requires decoding by a specially designed TV set, or a standard receiver with an STB, or a PC fitted with a television card. The major DTV standards are ATSC (North America), DVB (Europe) and ISDB (Japan). All three use MPEG-2 video compression and Dolby Digital audio compression.

What does analogue mean?
A continuously varying signal. For example, if an analogue signal's range is from 0V to 5V, the signal can assume any voltage within that range such as 1.2, 2.4, or 4.7V. Microprocessors and microcontrollers usually cannot process analogue signals directly and require conversion by an A/D converter before they can process the signal.