Widescreen signaling

In television technology, widescreen signaling (WSS) is a digital stream embedded in the TV signal describing qualities of the broadcast, in particular the intended aspect ratio of the image. This can be used by a widescreen TV to switch to the correct display mode.

The signal is placed in line 23 (PAL) and lines 20/283 (PAL-M and NTSC) and has 14 bits of information indicating:

B00 to B03 - Aspect Ratio


* [http://pda.etsi.org/pda/queryform.asp ETSI] EN 300 294 "Television Systems: 625-Line Television Wide Screen Signaling (WSS)"

See also

*Active Format Description (AFD)

External links

* [http://www.eetasia.com/ARTICLES/1999NOV/1999NOV15_AMD_MSD_AN.PDF PDF of WSS standard]

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