QAM (television)

QAM stands for quadrature amplitude modulation, the format by which digital cable channels are encoded and transmitted via cable television providers. 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 televisions support both of these standards. QAM uses the same 6 MHz bandwidth as ATSC, using a standard known as ITU-J.83b.^[1][2]

Technical details

QAM is a modulation format and does not specify the format of the digital data being carried. However, when used in the context of US digital cable television, the format of the data transmitted using this modulation is based on ITU-J.83b (as used in the DOCSIS standard for internet over cable). This is in contrast to DVB-C which is also based on QAM modulation, but uses a DVB-based data format which is incompatible with North American receivers.

QAM modulation is a parallel form of modulation that transmits 2 independent signals at a symbol rate that is near, but less than, the bandwidth of 6 MHz. VSB modulation, on the other hand, is a serial form of modulation that transmits 1 independent signal at a symbol rate that is near, but less than, twice the bandwidth of 6 MHz. The two can be related by the fact that a VSB signal can be shown to be a form of offset QAM modulation where one of the 2 independent signals is delayed by 1/2 a symbol duration. The 8-VSB modulation in the ATSC system corresponds with the 64-QAM modulation of J.83b. In a 6 MHz channel, the data rate is at most 36 Mbit/s (for 64-QAM or 8-VSB); the 8-VSB ATSC achieves a data rate of 19.3926 Mbit/s while the 64-QAM J.83b achieves a data rate of 26.970 Mbit/s. While both systems use concatenated trellis/RS coding, the differences in symbol rate and FEC redundancy account for the differences in rate. In addition, J.83b defines a popular 256-QAM mode that achieves a data rate of 38.8 Mbit/s.

Many cable providers offer few or no details about unencrypted QAM channels. It is also common for cable providers to falsely insist that a set top box from the cable company is required to watch all digital cable channels, including unencrypted channels, even though QAM channels may be distributed via their system. QAM channels may move without notification and some channels may have strange numbering schemes.

QAM tuners

In North American digital video, a QAM tuner is a device present in some digital televisions and similar devices which enables direct reception of digital cable channels without the use of a set-top box.^[3] An integrated QAM tuner allows the free reception of unscrambled digital programming sent "in the clear" by cable providers, usually local broadcast stations, cable radio channels, or in the case of providers which have transitioned to do so, Public-access television cable TV channels. Which channels are scrambled varies greatly from location to location and can change over time; the majority of digital channels are scrambled because the providers consider them to be extra-cost options and not part of the "basic cable" package.^[4]

Most US TVs sold after 2006 include a QAM tuner, though some low end and less expensive models still do not include the functionality to tune QAM channels as of 2009. Even though the hardware used to tune ATSC (over the air digital) and QAM (digital cable) channels is similar, there are still plenty of devices on the market as of 2009 which can tune ATSC signals but not QAM signals. Some do have the QAM feature but do not describe it in the operator's manual or on-screen menu options, choosing instead to place it under the category of a channel scan and forcing viewers to delete many scrambled channels after a scan. The FCC mandates that all new TVs sold in the US must include an ATSC tuner, but there are no requirements for QAM tuning functionality.^[5]

Beginning in 2013, Comcast (the largest cable company in the United States), began encrypting all channels in certain regions, including all local / basic tier channels. It's believed that in the coming years other cable providers will eventually encrypt all of their channels. Originally, The Federal Communications Commission required cable providers not to encrypt basic tier or local channels, however, the FCC reversed its decision under pressure from Comcast and other providers.

Unencrypted QAM tuners are available for computers and many software DVR options exist to work in conjunction with QAM, namely Elgato's EyeTV, SageTV (native support of high definition QAM), MythTV (also native support for HD QAM), and Snapstream's Beyond TV, Microsoft's Windows Media Center software supports QAM on supported tuners (on Vista with the TV Pack update or with Windows 7).

References