Example image of eyePlorer eyePlorer map for 'Set-top box': Content (media and publishing) Display device Information appliance Signal (electronics) Television ITV All-Channel Receiver Act Channel 2 Channel 83 Hertz North America NTSC Television set Ultra high frequency Very high frequency Mexico Cable television Channel 13 Channel 7 Analog signal Cable converter box Television channel Channel 3 Channel 4 Low-noise block converter Videocassette recorder Digital cable Encryption Home shopping Pay-per-view Video on demand Decoder 19-inch rack Serial digital interface Broadcasting Digital Digital television Tuner Astro (satellite TV) Direct-broadcast satellite DirecTV Dish Network Satellite dish SES Astra British Sky Broadcasting Digibox Digital terrestrial television Freeview (UK) Sky Digital (UK & Ireland) United Kingdom