Pattern 7: "Delay" - Philips PM 5508 Operating Manual

38
G. Pattern 7.
"DELAY"
Fig. VII-13.
"DELAY"-pattern
This pattern is designed especially for checking the PAL delay-line cir-
cuitry. If displayed on the screen of a colour receiver the first two bars
should have ayellow/greenish colour and the other two should be grey
{on some receivers these grey bars appear slightly bluish; this however is
of no importance for this measurement).
The colour difference signals of this pattern are encoded according to the NTSC standard,
i.e. the (R-Y) information is not line -sequentially reversed in phase. The burst in this signal,
however, is normally encoded according to the PAL standard, i.e. the burst is line sequen-
tial in the 135° and 225° phases, see vector diagram, Fig. VII-14.
Y
1
1
1
1
1
1