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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 ...
In the United States, 64-QAM and 256-QAM are the mandated modulation schemes for digital cable (see QAM tuner) as standardised by the SCTE in the standard ANSI/SCTE 07 2013. In the UK, 64-QAM is used for digital terrestrial television whilst 256-QAM is used for Freeview-HD. Bit-loading (bits per QAM constellation) on an ADSL line
Most cable companies require a set-top box (cable converter box) or a slot on one's TV set for conditional access module cards [2] to view their cable channels, even on newer televisions with digital cable QAM tuners, because most digital cable channels are now encrypted, or scrambled, to reduce cable service theft. A cable from the jack in the ...
Built-in support for receiving digital cable channels (via an internal QAM tuner) A slot for the current version of CableCARD, which allows decryption of encrypted digital channels The CableCARD 2.0 specification includes support for #1-4, interactive two-way communications; however it is unknown exactly when CableCARD 2.0 hosts and compatible ...
Fios TV is one of three services offered by Verizon Fios. Fios TV uses QAM technology to deliver signals to a customer's property using its fiber optic cables. [9] At the home, the optical network terminal turns the signal into a radio frequency signal that can be used on a home's existing coaxial cables, feeding the signal to a set-top box ...
QAM Mapper: the bit sequence is mapped into a base-band digital sequence of complex symbols. There are 5 allowed modulation modes: 16- QAM , 32-QAM, 64-QAM, 128-QAM, 256-QAM. Base-band shaping: the QAM signal is filtered with a raised-cosine shaped filter, in order to remove mutual signal interference at the receiving side.
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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.