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High Definition (HD) television
(264 total words in this text)
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We provide an RG6 cable infrastructure that supports HDTV. The two cables we use have bandwidth swept tested up to 2.2 Ghz and 3.0 Ghz. The current bandwidth requirement for compressed HD Cable is 860 Mhz.
April 2005, all TV stations must simulcast 100 percent of their NTSC programming on their DTV channel.
December 31, 2006, all TV stations must turn off their analog signal (unless it gets pushed back again).
The days of rabbit ears are gone, unless you have an off air HDTV tuner. This tuner will also convert the HD signal back down to 480i for older analog TV's.
We have found many cable companies are offering HD in the compressed format of 860 MHz. One example is the Motorola High-Definition Cable Receiver DCT6200 (54 - 860 MHz tuner). Compression removes small amounts of data deemed un-noticable. TV resolution is increasing enormously, so this is becoming noticable. Also the demand on the decoder in the cablebox to un-compress is causing a delay between audio and video.
Today many companies are converting to 1 Ghz bandwidth. Removing some compression will reduce decompression time and remove more artifacts in the picture.
To better understand compression, compare to MP3 sample rates of 128 kbps or 192 kbps. If you use poor quality speakers, you probably won't hear a difference between the two sample rates. There is an audiable difference if you listen on a decent system with nice speakers.
To learn more check out this website HDTVinfoport |
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