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Technology Events
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SDTV Standard definition television (SDTV) is the basic quality of digital television. SDTV is better than conventional definition television (CDTV also called NTSC and analog color TV) by a few hundred horizontal pixels. Here's a quick comparison of the differences. Of course these images would be stretched across the television screen, but this shows the images with equal sized pixels.
VHS is the lowest quality that you'll see on most TVs besides home videos.
CDTV is more commonly known as NTSC. It's the basic signal that was defined in 1953! Over 50 years old and its still going strong. How's that for some technology ahead of its time.
SDTV is your basic digital format that is pretty darn good when it's not compressed to death. The basic 640 x 480 spatial resolution is often quoted but rarely met because cable and satellite companies compress the quality of the images to below CDTV. They do this to fit more channels in a given bandwidth. They compromise quality to deliver quantity (of stations). A very American trait. I'd rather have the quality of HDTV below.
High Defintion Television (HDTV) 1280 X 720 or 1920 X 1080 HDTV comes in two different formats and you usually have no way of knowing the difference in the signals that are being sent to you. 720p has 720 scan lines and 1280 horizontal pixels. 1080i or p has 1,080 scan lines and 1,920 horizontal pixels in each scan line. (this image is actually only 400 pixels tall because the image is huge if it actual size). TV |
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