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2. Cable converter box - Wikipedia

   en.wikipedia.org/wiki/Cable_Converter_Box

   A cable converter box or television converter box is an electronic tuning device that transposes/converts channels from a cable television service to an analog RF signal on a single channel, usually VHF channel 3 or 4, or to a different output for digital televisions such as HDMI.

3. Digital television adapter - Wikipedia

   en.wikipedia.org/wiki/Digital_television_adapter

   A converter box takes the digital signal from the antenna and outputs composite video (for SD TVs) or HDMI (for HD TVs). A RF/antenna output, if present on a converter box, is usually just a passthrough ("LOOP OUT" which does not provide the box's output signal, but only provides the raw antenna input signal to watch analog channels via a TV ...

4. RF modulator - Wikipedia

   en.wikipedia.org/wiki/RF_modulator

   The modulator is then programmed to broadcast the signals on a certain frequency. That RF broadcast is then received by the connected TV. When the TV is tuned to the programmed channel, the video and audio signal of the source device is accessed. RF modulation can become difficult in a CATV system. High pass, low pass, and notch filters must be ...

5. Analog passthrough - Wikipedia

   en.wikipedia.org/wiki/Analog_passthrough

   Any converter box converts the digital signal for the current digital sub-channel to an analog signal (at the reduced screen resolution of the analog standard), outputs that signal onto analog channel 3 or 4 (set by the user to avoid any conflict with local over-the-air channels) and sends that signal to the analog tuner on the TV.

6. Digital TV transition: 46.2 million converter boxes later ...

   www.aol.com/2010/06/11/digital-tv-transition-46...

   The digital TV transition went live almost a year ago on June 12, 2009, when the FTC flipped the switch and turned off the analog television signals that many consumers relied on for entertainment.

7. 8VSB - Wikipedia

   en.wikipedia.org/wiki/8VSB

   ATSC and DVB-T specify the modulation used for over-the-air digital television; by comparison, QAM is the modulation method used for cable. The specifications for a cable-ready television, then, might state that it supports 8VSB (for broadcast TV) and QAM (for cable TV). 8VSB is an 8-level vestigial sideband modulation.