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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 (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 | |
| 1 | 1 | 1 | 0 | 14:9 | Full-height 4:3, framed to be "14:9-safe" | 576 |
| 0 | 1 | 1 | 1 | 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
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