576p
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576p is the shorthand name for a video display resolution. The p stands for progressive scan, i.e. non-interlaced, the 576 for a vertical resolution of 576 pixels, usually with a horizontal resolution of 768, 720 or 704 pixels. The frame rate can be given explicitly after the letter.[1]
576p25[edit]
576p25 has a frame rate of 25 frames per second, and thus uses the same bandwidth and carries the same amount of pixel data as 576i; as such, 576p25 is considered to be standard definition. It can be used on analog PAL or SECAM systems, where it may be transported as a 576i signal with both interlaced fields corresponding to a unique frame. PALplus supports it via a "movie" mode signal flag. It can also be transported by both major digital television formats, ATSC and DVB, and on DVD.
576p50[edit]
With doubled temporal resolution, 576p50 is considered enhanced-definition television (EDTV), regardless of the image being scaled the same way as an interlaced frame. In some countries, such as Australia, the 576p resolution standard is technically considered high-definition and was in use by the Special Broadcasting Service (SBS TV) (16:9 the format has aspect ratio 1.468), eventually replaced by 720p for its high-definition subchannel; SBS later changed to using 1080i. The Seven Network initially used 576p for its high-definition subchannel, but now uses 1080i instead.
The frames are doubled (from a 25 frame source) on broadcast (to avoid flicker) for display devices that lack any kind of frame doubling ability. Widescreen 16:9 material has only the width scaled down to fit 720 pixels instead of an unscaled 1024 width. SMPTE 344M defines a 576p50 standard with twice the data rate of BT.601, using 704 × 576 active pixels with 16 x 576 horizontal blanking pixels.
See also[edit]
- List of common resolutions
- 4320p, 2160p, 1080p, 1080i, 720p, 640p, 576i, 480p, 480i, 360p, 240p
- WSVGA, the associated computer display resolution
- Enhanced-definition television (EDTV)
Television[edit]
References[edit]
- ^ AfterDawn.com. "576p - AfterDawn: Glossary of technology terms & acronyms".
