What is a QAM Tuner?
Question: on a HDTV
Answers: QAM is the modulation method of choice for cable HDTV. It's different than modulation used for over-the-air digital TV (DTV). The reason cable uses QAM is because it allows them to place twice as many HD channels in the same bandwidth, without any loss of image and sound quality.
Many (but not all) cableco's pass local HD channels in the clear using QAM. With a QAM capable tuner, you can receive those channels with any basic cable subscription. Comcast & TWC are the most prominent of the cableco's who pass local HD in the clear. Cox is the most prominent that does not pass local HD in the clear.
All cableco's scramble digital tier HD channels (ESPN HD, INHD, etc.) and premium HD channels (HBO, Showtime, etc.), and can only be received using a cableco supplied STB.
This will change somewhat in the very near future, as CableCARD equipment hits the market this summer. CableCARD STB's & HDTV's will have conditional access to allow receiving all subscribed channels, HD & otherwise; you buy the hardware of choice and the cableco rents you the access card. PPV, VOD, and other two-way dependent services, like on screen programming guides will not be available with the initial versions of CableCARD equipment.
QAM stands for Quadrature Amplitude Modulation which makes use of a modulation technique that uses amplitude as well as phase for encoding data for higher data rates. But it is also the signal modulation system used for digital Cable.
Answers: QAM is the modulation method of choice for cable HDTV. It's different than modulation used for over-the-air digital TV (DTV). The reason cable uses QAM is because it allows them to place twice as many HD channels in the same bandwidth, without any loss of image and sound quality.
Many (but not all) cableco's pass local HD channels in the clear using QAM. With a QAM capable tuner, you can receive those channels with any basic cable subscription. Comcast & TWC are the most prominent of the cableco's who pass local HD in the clear. Cox is the most prominent that does not pass local HD in the clear.
All cableco's scramble digital tier HD channels (ESPN HD, INHD, etc.) and premium HD channels (HBO, Showtime, etc.), and can only be received using a cableco supplied STB.
This will change somewhat in the very near future, as CableCARD equipment hits the market this summer. CableCARD STB's & HDTV's will have conditional access to allow receiving all subscribed channels, HD & otherwise; you buy the hardware of choice and the cableco rents you the access card. PPV, VOD, and other two-way dependent services, like on screen programming guides will not be available with the initial versions of CableCARD equipment.
QAM stands for Quadrature Amplitude Modulation which makes use of a modulation technique that uses amplitude as well as phase for encoding data for higher data rates. But it is also the signal modulation system used for digital Cable.
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