Atss Sorting Method - Daewoo DDT-21H9ZDF(21") Service Manual

1-3 A TSS sorting method
The TV set sweeps all the TV bands from beginning of VHF to end of UHF. The TV controlling softw are for each
program checks if a VPS CNI code is transmitted ( this system e xists for German, Swiss and Austrian transmissions).
If no VPS CNI code is found , then the system check if a CNI code is transmitted as part of the teletext transmission
( Packet 8/30 format 1 ). If such a code ( VPS or teletext ) is found and if this code is in the A TSS list, the program is
automatically named.
If the transmission does not have VPS CNI, and no teletext service is availab le, then there is no possibility of the
program being automatically named.
The programs are found then sorted in 4 groups :
Group I : It contains all the pro grams from the selected country and named by the TV controlling softw are. Within this
group the sorting order is fixed by the ATSS list.
Group II : It contains all the pro grams with a strong signal strength which are not listed in group I.
Group III : It contains all the pro grams with a weak signal strength which are not listed in group I.
Group IV : If two or more programs with the same code are found, only the strongest ( or if they have the same level
the one with the lowest frequency) is listed in group I, II or III. The others are listed in group IV.
Program
Group
number
1
2 Group I
...
n
n+1
... Group II
m
m+1
... Group III
p
p+1
... Group IV
q
q+1
.... not used
99
0
Special case : France
Note : If two programs with the same name but a different code ar e found these two programs are listed in
group I, II or III ( e.g. Regional pro gram SW3 in Germany ).
The sorting order within group II, III, and IV is based on the channel frequency. The Program with the lowest
frequency is allocated the first rank in its group, and so forth until the last program of the group which has the
highest frequency.
Special case : France
If France is selected, the TV controlling software swee ps all TV bands with France system selected firstly
( positi ve video modulation) and the second time with Europe system selected ( nega tive video modulation).
Special case : Switzerland
If Switzerland is selected the TV controlling software swee ps all TV bands with Europe system selected firstly
(ne ga tive video modulation) and the second time with France system selected ( positive video modulation).
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Program
Group
number
1
... Group II
m
m+1
... Group III
p
p+1
... Group IV
q
q+1
.... not used
99
0
Special case : Country selection = Others
Service Manual CP-099/FS
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