Digital Signal
Feb 22
2009
2009
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Digital Signal
What resolution is the "over the air" digital signal?
I just bought a new TV for the main purpose of HD gaming. I am unable to afford cable/satellite at the moment, so for watching TV, I'm going to have to resort to basic channels using the "over the air" digital signal. Do networks broadcast their signal in 1080p? It'd be nice to catch some sports in HD.
Over the air digital HDTV: 720p or 1080i.
(OTA digital SD: 480p)
Most broadcasters have chosen 1080i, but Fox and ABC have chosen 720p. 720p is better for sports and other fast-moving video than 1080i, which is why cable sports network ESPN chose 720p for their HD.
Broadcasters and cablecasters use 1080i, not 1080p, because of bandwidth limitations.
HD gaming and Blu-Ray players can use 1080p, because they get to use a whole HDMI cable (or set of component cables) for themselves alone. They don't have to share broadcast frequency spectrum with other broadcasters, or share cable bandwidth with other cablecasters.
DSP 5C: Digital Signal Processing - Prof E. Ambikairajah
