Editing Widescreen signaling (section)

==525 line systems==
[[525 lines|525 line]] analog systems (like [[NTSC]] or [[PAL-M]]) made a provision for the use of pulses for signaling widescreen and other parameters, introduced with the development of [[Clear-Vision]] (EDTV-II), a NTSC-compatible Japanese system allowing widescreen broadcasts.'''<ref>{{Cite journal |last1=Nakayama |first1=K. |last2=Kojima |first2=T. |last3=Miyaguchi |first3=H. |last4=Sawaragi |first4=T. |last5=Yaguchi |first5=Y. |date=August 5, 1995 |title=EDTV-II decoder by SVP2 (the 2nd generation of scan-line video processor) |url=https://ieeexplore.ieee.org/document/468089 |journal=IEEE Transactions on Consumer Electronics |volume=41 |issue=3 |pages=634–642 |doi=10.1109/30.468089 |via=IEEE Xplore|url-access=subscription }}</ref><ref>{{Cite web |title=The Journal of the Institute of Television Engineers of Japan |url=https://www.jstage.jst.go.jp/browse/itej1978/49/9/_contents/-char/en |website=www.jstage.jst.go.jp}}</ref>''' On these systems the signals are present in lines 22 and 285, as 27 data bits, as defined by [[IEC 61800|IEC 61880]].<ref name="auto"/><ref>{{Cite book |url=https://www.renesas.com/us/en/document/apn/an9716-widescreen-signaling-wss |title=AN9716: Widescreen Signaling (WSS) |publisher=Renesas Electronics Corporation |year=1998}}</ref><ref name=":15">{{Cite book |url=https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.1298-0-199710-W!!PDF-E.pdf |title=RECOMMENDATION ITU-R BT.1298 - Enhanced wide-screen NTSC TV transmission system |publisher=ITU |year=1997}}</ref><ref>{{Cite book |last=Kageyama |first=Masahiro |url=https://nagoya.repo.nii.ac.jp/record/12994/files/o6927.pdf |title=Thesis Research on high image quality and high functionality of television |year=2010}}</ref><ref name=":0" /><ref>{{Cite book |last1=Jack |first1=Keith |url=https://books.google.com/books?id=4Hsh7J0d1DwC&dq=%22Widescreen+signaling%22+-wikipedia&pg=PA147 |title=Dictionary of Video and Television Technology |last2=Tsatsoulin |first2=Vladimir |date=2002-09-11 |publisher=Gulf Professional Publishing |isbn=978-1-878707-99-4 |language=en}}</ref>

The following table shows the information present on the signal, based on Rec. ITU-R BT.1119-2 ("helper" signals are EDTV-II specific):<ref name="auto"/>
{| class="wikitable"
! Bit !! Item
|-
| 1 || Reference signal
|-
| 2 || Reference signal
|-
| 3 || Aspect ratio (4:3 full format / 16:9 letterbox)
|-
| 4 || Even parity for B3 to B5
|-
| 5 || Reserved
|-
| 6 || Field type (First field / Next field)
|-
| 7 || Frame type (Reference frame / Other frame)
|-
| 8 || Vertical temporal helper (no / yes)
|-
| 9 || Vertical high resolution helper (no / yes)
|-
| 10 || Horizontal helper (no / yes)
|-
| 11 || Horizontal helper pre-combing (no / yes)
|-
| 12 to 14 || For TV station use
|-
| 15 to 17 || Reserved
|-
| 18 to 23 || Error correction codes for B3 to B17
|-
| 24 || Reference signal
|-
| 25 to 27 || Confirmation signal
|}