Set-top boxes can also enhance source signal quality.īefore the All-Channel Receiver Act of 1962 required US television receivers to be able to tune the entire VHF and UHF range (which in North America was NTSC-M channels 2 through 83 on 54 to 890 MHz), a set-top box known as a UHF converter would be installed at the receiver to shift a portion of the UHF-TV spectrum onto low-VHF channels for viewing. Satellite and microwave-based services also require specific external receiver hardware, so the use of set-top boxes of various formats has never completely disappeared. Content, in this context, could mean any or all of video, audio, Internet web pages, interactive video games, or other possibilities. The signal source might be an Ethernet cable, a satellite dish, a coaxial cable (see cable television), a telephone line (including DSL connections), broadband over power lines (BPL), or even an ordinary VHF or UHF antenna. 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.
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