Digital Tv Essay

1080 WordsOct 19, 20115 Pages
“DIGITAL TV” TABLE OF CONTENTS I. INTRODUCTION GENERAL INFORMATION II. MAIN BODY TECHNICAL INFORMATION RECEPTION INTERACTION III. CONCLUSION ADVANTAGES AND DISADVANTAGES PERSONAL OPINION INTRODUCTION Digital television (DTV) is a telecommunication system for broadcasting and receiving moving pictures and sound by means of digital signals, in contrast to analog signals used by analog (traditional) TV. DTV uses digital modulation data, which is digitally compressed and requires decoding by a specially designed television set, or a standard receiver with a set-top box, or a PC fitted with a television card. Introduced in the late 1990s, this technology appealed to the television broadcasting business and consumer electronics industries as offering new financial opportunities. MAIN BODY TECHNICAL INFORMATION A broadcaster may opt to use a standard-definition digital signal instead of an HDTV signal, because current convention allows the bandwidth of a DTV channel (or "multiplex") to be subdivided into multiple sub channels, providing multiple feeds of entirely different programming on the same channel. This ability to provide either a single HDTV feed or multiple lower-resolution feeds is often referred to as distributing one's "bit budget" or multicasting. This can sometimes be arranged automatically, using a statistical multiplexer (or "stat-mux"). With some implementations, image resolution may be less directly limited by bandwidth, for example in DVB-T, broadcasters can choose from several different modulation schemes, giving them the option to reduce the transmission bit rate and make reception easier for more distant or mobile viewers. RECEPTION There are a number of different

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