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QAM is used in a variety of communications systems such as Dial-up modems and WiFi. In cable systems, a QAM tuner is linked to the cable in a manner that is equivalent to an ATSC tuner which is required to receive over-the-air (OTA) digital channels broadcast by local television stations when attached to an antenna. Most new HDTV digital ...
Digital cable broadcast tends to be DVB-C or very similar QAM in almost all countries. Broadband on cable is mostly DOCSIS which is DVB-C on the download path. This is important when buying a TV or set-box online rather than from a local retailer who would normally only stock the compatible system.
Broadcast In-band (IB) Tuner. Once the signal arrives from the physical transmission media, the IB tuner will isolate a physical from a multiplex of channels and convert to baseband. The term baseband is used to describe a single channel or digital signal, extracted from broadband signal which is a stream of multiple channels.
A separate tuner is required to receive HD satellite broadcasts. Cable television companies in the U.S. generally prefer to use 256-QAM to transmit HDTV. Many of the newer HDTVs with integrated digital tuners include support for decoding 256-QAM in addition to 8VSB for OTA digital. Cable television companies started carrying HDTV in 2003.
Unlike standard set-top box (or set-top unit) appliances, HDHomeRun does not have a video output that connects directly to the user's television. It instead receives a live TV signal and then streams the decoded video over a local area network to an existing smart phone, tablet computer, smart tv, set top streaming device, computer, or game console.
The tuner is produced by Pixela Corporation, and met the retail price of under 5,000 Japanese yen, which is the target price to industry by DPA (Association for Promotion of Digital Broadcasting (dejitaru housou suishin kyōkai)). The tuner connects to an old fashioned TV though an RCA connector with SDTV quality and some other minimal functions.