Set-top box 数位视讯转换盒
（重定向自Set top boxes）
![An Inview Neelix set-top box manufactured in 2012. It allows simultaneous access to television broadcast and internet applications](/Images/godic/202502/10/Set-top_Box,_20130658.png")
![A consumer Palcom DSL-350 satellite-receiver; the IF demodulation tuner is on the bottom left, and a Fujitsu MPEG decoder CPU is in the center of the board. The power supply is on the right.](/Images/godic/202502/10/Sat-Receiver_Palcom_DSL-3500658.jpg")
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![Set-top box firmware being updated](/Images/godic/202502/10/Set-top_box_firmware_being_updated0658.jpg")
A set-top box (STB) or set-top unit (STU) is an information appliance device that generally contains a TV-tuner input and displays output to a television set and an external source of signal, turning the source signal into content in a form that can then be displayed on the television screen or other display device. They are used in cable television, satellite television, and over-the-air television systems, as well as other uses.