Glossary

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480p A Standard Definition video format consisting of 480 vertical lines of display resolution in a Progressive scan, usually with a horizontal resolution of 640 pixels and 4:3 aspect ratio. The frame rate (hertz) is usually 30 or 60 progressive frames per second.
576i A Standard Definition video format consisting of 576 vertical lines of display resolution in an Interlaced scan. The format is used primarily in PAL and SECAM countries. The field rate (not to be confused with the frame rate), which is 50 Hz, is sometimes included when identifying the video mode - ie, 576i 50.
576p A Standard Definition video format consisting of 576 vertical lines of display resolution in a Progressive scan, usually with a horizontal resolution of 720 or 704 pixels. The frame rate can be given explicitly after the letter.
720p A High Definition video format consisting of 720 vertical lines of display resolution in a Progressive scan. When broadcast at 60 frames per second, 720p features the highest temporal (motion) resolution possible under the ATSC and DVB standards. Progressive scanning reduces the need to prevent flicker by filtering out fine details, so sharpness is much closer to 1080i than the number of scan lines would suggest.
1080p A High Definition video format consisting of 1,080 vertical lines of display resolution in a Progressive scan, meaning the image is not interlaced. Only 1080p can be referred to as full HD or full high definition although 1080i (interlaced) is also 1920x1080 pixels.
16:9 A type of Aspect Ratio. 16:9 is commonly known as widescreen and is wider than the standard 4:3 aspect ratio. Most new High Definition programming is in 16:9 format.
AC With AC (Alternating Current), the movement (or flow) of electric charge periodically reverses direction. An electric charge would for instance move forward, then backward, then forward, then backward, over and over again. In direct current (DC), the movement (or flow) of electric charge is only in one direction.
Analog Monitor Display unit that only accepts analog signals. All signals in such monitors pass through a completely digital section prior to display. While many similar connectors (13W3, BNC, etc..) were used on other platforms, the IBM PC and compatible systems long ago standardised the VGA connector.
Analog Video A video signal transferred by analog signal. It contains the luminance (brightness) and chrominance (colour) of the image, which may be carried in separate channels, as in component video (YPbPr) and S-Video, or combined in one channel, as in composite video and RF connector. Several types of signal formats are accepted by analog monitors: composite video, RGB & sync, Y/C, YUV and any combination of these formats.
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