A digital television adapter, or digital-to-analog converter, or commonly known as a converter box, is a device that receives a digital television transmission, and converts that signal into an analog television signal that can be received and displayed on an analog television set. It may refer to over-the-air terrestrial television signals received by an antenna, or to cable TV systems which switch to digital cable. It normally does not refer to satellite TV, which has always required a set-top box either to operate the big satellite dish, or to be the integrated receiver/decoder in the case of direct-broadcast satellites. In North America, these boxes convert from ATSC to NTSC, while in most of Europe and other places such as Australia, they convert from DVB to PAL. Because the DTV transition did nothing to reduce the number of video standards, and due to varying frequency allocations and bandplans, there are many other combinations specific to other countries.

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