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 1 B00 to B03 - Aspect Ratio 2 B04 to B07 - Enhanced Services 3 B08 to B10 - Subtitles 4 B11 to B13 - Others 5 References 6 See also 7 External links

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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

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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

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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

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References

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

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See also

• PALPlus
• Active Format Descriptor (AFD)
• Widescreen

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External links

• PDF of WSS standard

v • d • e Broadcast video formats Television Analog 525 lines NTSC · NTSC-J · PAL-M 625 lines PAL · PAL-N/NC · PALplus · SECAM Audio BTSC (MTS) · NICAM-728 · Zweiton (A2 / IGR) · EIAJ Hidden signals Captioning · Teletext · CGMS-A · GCR · PDC · VBI · VEIL · VITC · WSS · XDS Defunct systems Pre-1940 · 405 lines · 819 lines · Baird-Nipkow · MAC · MUSE Digital Interlaced SDTV (480i · 576i) · HDTV (1080i) Progressive LDTV (240p · 288p · 1seg) · EDTV (480p · 576p) · HDTV (720p · 1080p) MPEG-2 standards ATSC · DVB · ISDB · DMB-T/H MPEG-4 AVC standards DMB-T/H · DVB · SBTVD · ISDB (1seg) Audio AC3 (5.1) · MPEG Multichannel · PCM · LPCM · AAC Hidden 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

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