set-top box

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set-top box

(communications, networking)
(STB) Any electronic device designed to produce output on a conventional televesion set (on top of which it nominally sits) and connected to some other communications channels such as telephone, ISDN, optical fibre or cable. The STB usually runs software to allow the user to interact with the programmes shown on the television in some way.

Online Media are one STB manufacturer.

set-top box

A device that converts video content to analog or digital TV signals. For years, the set-top box (STB) was the cable box that "sat on top" of the TV. Although no more flat surface to rest anything, the term lives on.

A satellite TV set-top box is officially a "satellite receiver," and the box that converts over-the-air digital broadcasts to analog for old TVs is a "converter" (see TV converter box).

Apple TV, Fire TV, Android TV and Roku boxes connect to the home network for Internet access and convert video from Netflix, Hulu and other providers into TV signals. These "media hubs" go by many names and may accept local content from the home network as well (see digital media hub).

The Cable Set-Top Box
In the days of analog TV, cable boxes descrambled the premium channels and managed the high channel numbers very early TVs did not support. For today's digital service, the cable box decodes MPEG video frames, decrypts the premium channels and stores and displays the program guides. Also providing upstream communications for video-on-demand, digital cable boxes often have a built-in DVR for recording content on a hard drive.

Many cable TV companies also offer Internet service, but their set-top boxes are only for TV. The cable coming into the house is split into two lines: one to the set-top box and the other to the cable modem for Internet access. See MPEG, DVR, CableCARD, cable modem and hybrid set-top box.


Set It On Top
For years, people placed cable boxes on top of their CRT or projection TV sets because there was plenty of room.







Big and Little
The Motorola unit (top) connects to the cable company's coaxial cable, whereas the Apple TV (only four inches wide) gets its content via Ethernet or Wi-Fi.


Big and Little
The Motorola unit (top) connects to the cable company's coaxial cable, whereas the Apple TV (only four inches wide) gets its content via Ethernet or Wi-Fi.







Not as Elegant as the Sales Brochure
In practice, today's streaming set-top boxes are often hidden in the A/V cabinet and nothing much to look at. These three plug into the A/V receiver via HDMI and connect to the home network via the Ethernet switch.




Not as Elegant as the Sales Brochure
In practice, today's streaming set-top boxes are often hidden in the A/V cabinet and nothing much to look at. These three plug into the A/V receiver via HDMI and connect to the home network via the Ethernet switch.







Legacy Support in a Set-top Box
Older set-top boxes such as this Roku unit had analog outputs to accommodate legacy TVs. However, HDMI has pretty much replaced this variety of connectivity (see HDMI).
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And that new thing is that while by the end of this year, the PC companies, the Apples and the IBMs and the Motorolas are talking very enthusiastically about being able to give you 60 to 100 mips [million instructions per second] on your desktop, which is a very large number, you will be able to get an order of magnitude of even more speed from makers of videogames and settop box machines.
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'We'd hope people will utilise broadband connections to use a settop box to view the games on their television.'
DirecTV hopes to offer options for its 9 million satellite subscribers to add high-speed sat or DSL Internet connections for the TV through its settop box that would allow more compelling gaming, interactive and video-on-demand services.
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King's companies, Digital Switch and then Dreambox, supplied settop boxes which were capable of receiving both satellite and internet signals.