54200
Users Manual
5-14
Wide Screen Signalling (WSS)
General
The WSS information is transmitted in the first half of line 23 for 625 line systems. The
WSS bits are in accordance to the standards ETSI ETS 300294, Rec. ITU-R BT.1119,
and EACEM, Technical Committee Working Party Report 3.2. The WSS bits are actu-
ally transmitted by all PALplus broadcasters in Europe.
The WSS bits contain information on:
•
Aspect ratio range of transmitted signal and its position,
•
Position of subtitles,
•
Camera or film mode,
•
Surround sound,
•
Some bits are reserved for future Enhanced Defenition TV (EDTV) signalling, for
example, PALplus as well as for future use.
The WSS information signal is transmitted as a data burst in Bi-phase modulation coding
in the first half of line 23. The preamble contains a run-in and a start code followed by 14
data bits. The data bits are grouped in 4 data groups. For further details, see Figure below
and Table 5-7 'WSS Status Bits Transmission Scheme'.
Figure 5-9. Position WSS Signal TV Line 23, 625 Line Systems PAL
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