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:

Contents

B00 B01 B02 B03 Aspect ratio Picture placement Active lines
0 0 0 1 4:3 Full 576
1 0 0 0 14:9 Letterbox Centre 504
0 1 0 0 14:9 Letterbox Top 504
1 1 0 1 16:9 Letterbox Centre 430
0 0 1 0 16:9 Letterbox Top 430
1 0 1 1 >16:9 Letterbox deeper than 16:9
0 1 1 1 14:9 Full-height 4:3, framed to be "14:9-safe" 576
1 1 1 0 16:9 Full-height 16:9 (anamorphic) 576

B04 Mode
0 Camera Mode
1 Movie Mode
B05 Mode
0 PAL Standard
1 Colour Plus
B06 Mode
0 No Vertical Helper
1 Vertical Helper Present
B07 Ghost Cancellation

B08 Mode
0 no subtitles
1 Teletext subtitles
B09 B10 Mode
0 0 No subtitles
1 0 Subtitles inside active image
0 1 Subtitles outside active image
1 1 Reserved

B11 Mode
0 No surround sound information
1 Surround sound mode
B12 Mode
0 No copyright asserted or status unknown
1 Copyright asserted
B13 Mode
0 Copying not restricted
1 Copying restricted

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


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