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Widescreen signaling

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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 and has 14 bits of information indicating:

B00 to B03 - Aspect Ratio (4:3, Letterbox 14:9 Centre, Letterbox 14:9 Top, Letterbox 16:9 centre, Letterbox 16:9 Top, Letterbox deeper than 16:9, Full-height 16:9, framed to be "14:9-safe", Full-height 16:9) B04 to B07 - PALPlus (Colour Plus/Clean Pal usage, Movie Mode, Camera Mode, Teletext subtitles, on-screen subtitles, Ghost Cancelation) B08 to B10 - Teletext B11 to B13 - Undefined




References

  • ETSI EN 300 294 "Television Systems: 625-Line Television Wide Screen Signaling (WSS)"

See also


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