Widescreen Signaling
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Widescreen Signaling

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

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 0 - - -
0 0 0 1 4:3 Full 576
0 0 1 0 16:9 Letterbox top 432
0 0 1 1 - - -
0 1 0 0 14:9 Letterbox top 504
0 1 0 1 - - -
0 1 1 0 - - -
0 1 1 1 14:9 Full-height 4:3, framed to be "14:9-safe" 576
1 0 0 0 14:9 Letterbox centre 504
1 0 0 1 - - -
1 0 1 0 - - -
1 0 1 1 >16:9 Letterbox deeper than 16:9 <432
1 1 0 0 - - -
1 1 0 1 16:9 Letterbox centre 432
1 1 1 0 16:9 Full-height 16:9 (anamorphic) 576
1 1 1 1 - - -

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

525 line systems made a provision using pulses for signalling wide screen and some other parameters in a similar manner to PAL and SECAM. Players output them and NTSC compatible TVs (including multiformat) recognise them.

See also

References

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

External links


  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

Widescreen_signaling
 



 



 
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