Sampling (signal processing): Difference between revisions

Revision as of 17:08, 26 September 2024

Revision as of 14:52, 2 October 2024

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{{Short description|Measurement of a signal at discrete time intervals}}

{{Other uses|Sampling (disambiguation)}}

[[Image:Signal Sampling.svg|thumb|300px|Signal sampling representation. The continuous signal ''S''(''t'') is represented with a green colored line while the discrete samples are indicated by the blue vertical lines.]]

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=== Video sampling ===

{{More citations needed section|date=June 2007}}

[[Standard-definition television]] (SDTV) uses either 720 by 480  [[pixels]] (US [[NTSC]] 525-line) or 720 by 576  pixels (UK [[PAL]] 625-line) for the visible picture area.

[[High-definition television]] (HDTV) uses [[720p]] (progressive), [[1080i]] (interlaced), and [[1080p]] (progressive, also known as Full-HD).

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Video [[digital-to-analog converter]]s operate in the megahertz range (from ~3 MHz for low quality composite video scalers in early games consoles, to 250 MHz or more for the highest-resolution VGA output).

When analog video is converted to [[digital video]], a different sampling process occurs, this time at the pixel frequency, corresponding to a spatial sampling rate along [[scan line]]s. A common [[pixel]] sampling rate is:

* 13.5 MHz – [[CCIR 601]], [[D1 video]]