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Some countries have also introduced digital television and ended analog over-the-air transmissions. Most new TVs feature a digital tuner which allows reception of digital over-the-air TV without need of an external device such a converter box. If using a TV set without a digital tuner, an external converter box must be purchased and used.
Since March 1, 2007, all new television devices that receive signals over-the-air, including pocket-sized portable televisions, personal computer video capture card tuners, and DVD recorders, have been required to include digital ATSC tuners. [14] Prior to this, the requirement was phased-in starting with larger screen sizes.
A coupon-eligible converter box (CECB) was a digital television adapter that met eligibility specifications for subsidy "coupons" from the United States government.The subsidy program was enacted to provide terrestrial television viewers with an affordable way to continue receiving free digital terrestrial television services after the nation's television service transitioned to digital ...
Analog-only TVs are incapable of receiving over-the-air broadcasts without the addition of a set-top converter box. Consequently, a digital converter box – an electronic device that connects to an analog television – must be used to allow the television to receive digital broadcasts.
NBC. CBS. ABC. Fox. The CW. PBS. The five major commercial broadcast television networks, along with PBS. In the United States, for most of the history of broadcasting, there were only three or four major commercial national terrestrial networks. From 1946 to 1956, these were ABC, CBS, NBC and DuMont.
Some television sets will continue to use analog NTSC tuners if connected to an analog cable system, or a converter box (which may receive digital signals over the air, from a cable system, or from a satellite system). Low-power stations continue to broadcast in analog, but these must transition to digital by September 1, 2015, or go silent. [89]