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Widescreen signaling

From Wikipedia, the free encyclopedia

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

PAL and SECAM Systems

For 625 scan line systems (PAL and SECAM), the signal is placed in line 23. It begins with a run-in code and start code followed by 14 bits of information.[1]

Group 1 (Aspect Ratio)

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 432
0 0 1 0 16:9 Letterbox top 432
1 0 1 1 >16:9 Letterbox deeper than 16:9 <432
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

Group 2 (Enhanced Services)

b04 Mode
0 Camera Mode (interlaced)
1 Movie Mode (progressive scan)
b05 Mode
0 PAL Standard
1 Colour Plus
b06 Mode
0 No Vertical helper
1 Vertical helper present

The above settings are related to PALplus.


b07 Ghost cancellation

Group 3 (Subtitles)

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

Group 4 (Other)

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

NTSC Systems

525 scan line systems (PAL-M and NTSC) put the WSS data in lines 20 and 283. A start code consisting of the bits "10" is used, followed by 14 bits of information.

Word 0

b0 Aspect Ratio
0 4:3
1 16:9
b1 Mode
0 Normal
1 Letterbox

b2-b5 all have the value "0".

Word 1

b6-b9 are reserved and all have the value "0".

Word 2

b10-b13 are reserved and all have the value "0".

See also

References

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

External links

This page was last edited on 18 July 2016, at 23:30
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