November 23, 2005]
DirecTV Now Using MPEG-4 Technology
By PATRICK BARNARD
TMCnet Associate Editor
DirecTV Inc. recently started transmitting high-definition MPEG-4 signals in Detroit and plans to bring MPEG-4 technology to each of its markets during the next few years.
Although the move to MPEG-4 will make no difference, in terms of picture quality, to DirecTV’s customers, it makes a huge difference to the company because MPEG-4 signals eat up far less bandwidth. While a single MPEG-2 HD stream takes up the space of six standard-definition TV channels, MPEG-4 is at least twice as efficient, taking up the equivalent of three channels or less.
Next year, the company plans to launch more MPEG-4 HDTV signals in more markets, culminating in 2007, when it plans to offer 1,500 local and 150 national channels in the format on four new satellites.
MPEG-4 technology levels the playing field for DirecTV with cable operators and telephone companies, in that it can also now deploy high-definition on a market-by-market basis. The MPEG-4 codec allows telcos to offer more channels than they could offer using MPEG-2 encoding, but telco set-top vendors haven’t been able to secure chip sets fast enough. DirecTV has reportedly solved that problem by purchasing silicon from Broadcom Corp.
To further improve efficiency, DirecTV is combining the MPEG-4 encoding with DVB-S2 technology, which uses 8PSK modulation, a higher order of modulation than the current 4PSK standard. DVB-S2 also uses a more efficient error-correcting code.
In Detroit, DirecTV’s first market, the company is taking the MPEG-2 HD feeds of the ABC, CBS, NBC and Fox affiliates, digitizing and encrypting their signals, then transporting them via its national fiber backbone to its uplink facility in California. Using encoders from Tandberg Television, the signals are converted to MPEG-4, then sent out via one of DirecTVs Ka-band satellites.
DirecTV is now marketing an MPEG-4-capable receiver, manufactured by LG Electronics, in the Detroit area. The receiver contains the key MPEG-4 chip set necessary to receive and display the HD signals. It also has tuners for standard-definition channels, as well as the 18 MPEG-2 HD signals DirecTV offers. Consumers can buy the receiver for $199, but with a rebate of $200, the net cost is zero.
There is a significant cost in bringing MPEG-4 technology to consumers. But Pontual said he expects that by next year there will be a “significant price reduction” in MPEG-4 set top boxes.
”In the long run, DirecTV believes the MPEG-4 boxes won’t cost any more than current MPEG-2 boxes,” he said.
Meanwhile, other satellite television service providers are moving cautiously in implementing MPEG-4 technology.
Patrick Barnard is Associate Editor for TMCnet and a columnist covering the telecom industry. To see more of his articles, please visit Patrick Barnard’s columnist page.
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