televisiontechnology, widescreen signaling (WSS) is a digitalstream 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 widescreenTV 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)"
Active Format Description(AFD)
* [http://www.eetasia.com/ARTICLES/1999NOV/1999NOV15_AMD_MSD_AN.PDF PDF of WSS standard]
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