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Widescreen signaling

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 (PAL) and lines 20/283 (PAL-M and NTSC) and has 14 bits of information indicating:

Contents

B00 to B03 - 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 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 to B07 - Enhanced Services

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 to B10 - 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

B11 to B13 - Others

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

References

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

See also

External links

v • d • eBroadcast video formatsTelevisionAnalog525 linesNTSC · NTSC-J · PAL-M625 lines PAL · PAL-N/NC · PALplus · SECAMAudioBTSC (MTS) · NICAM-728 · Zweiton (A2 / IGR) · EIAJHidden signals Captioning · Teletext · CGMS-A · GCR · PDC · VBI · VEIL · VITC · WSS · XDSDefunct systems Pre-1940 · 405 lines · 819 lines · Baird-Nipkow · MAC · MUSE
Digital InterlacedSDTV(480i · 576i) · HDTV(1080i) ProgressiveLDTV(240p · 288p · 1seg) · EDTV(480p · 576p) · HDTV(720p · 1080p) MPEG-2standards ATSC · DVB · ISDB · DMB-T/HMPEG-4 AVCstandards DMB-T/H · DVB · SBTVD · ISDB(1seg) AudioAC3(5.1) · MPEG Multichannel · PCM · LPCM · AACHidden signals Captioning · Teletext · CPCM · Broadcast flag · AFD · EPG
Digital cinema UHDV (2540p · 4320p) · DCI Technical issues 14:9 compromise · MPEG transport · Reverse Standards Conversion · Standards conversion · Video processing · Video on demand · HDTV blur  This television-related article is a stub. You can helpWikipedia by expanding it.
Categories: Television technology | Television stubs

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