Terrestrial television | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-05

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Terrestrial_television


00:02:23 1 Analogue terrestrial television
00:02:32 1.1 Europe
00:03:31 1.2 Americas
00:05:54 1.3 Asia
00:06:49 2 Digital terrestrial television
00:09:48 3 Competition for radio spectrum



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SUMMARY
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Terrestrial television is a type of television broadcasting in which the television signal is transmitted by radio waves from the terrestrial (Earth-based) transmitter of a television station to a TV receiver having an antenna.  The term terrestrial is more common in Europe and Latin America, while in the United States it is called broadcast or over-the-air television (OTA).  The term "terrestrial" is used to distinguish this type from the newer technologies of satellite television (direct broadcast satellite or DBS television), in which the television signal is transmitted to the receiver from an overhead satellite, cable television, in which the signal is carried to the receiver through a cable, and Internet Protocol television, in which the signal is received over an Internet stream or on a network utilizing the Internet Protocol.  Terrestrial television stations broadcast on television channels with frequencies between about 52 and 600 MHz in the VHF and UHF bands.  Since radio waves in these bands travel by line of sight, reception is limited by the visual horizon to distances of 40–60 miles (64–97 km).    
Terrestrial television was the first technology used for television broadcasting.  The BBC began broadcasting in 1929 and by 1930 many radio stations had a regular schedule of experimental television programmes.  However, these early experimental systems had insufficient picture quality to attract the public, due to their mechanical scan technology, and television did not become widespread until after World War II with the advent of electronic scan television technology. The television broadcasting business followed the model of radio networks, with local television stations in cities and towns affiliated with television networks, either commercial (in the US) or government-controlled (in Europe), which provided content.  Television broadcasts were in black and white until the transition to color television in the 1950s and 60s.There was no other method of television delivery until the 1950s with the beginnings of cable television and community antenna television (CATV). CATV was, initially, only a re-broadcast of over-the-air signals.  With the widespread adoption of cable across the United States in the 1970s and 1980s, viewing of terrestrial television broadcasts has been in decline; in 2013, it was estimated that about 7% of US households used an antenna. A slight increase in use began after the 2009 final conversion to digital terrestrial television broadcasts, which offer HDTV image quality as an alternative to CATV for cord cutters.