54200
Users Manual
4-74
Insertion-Reference Signal (IRS)
Description:
The Insertion-Reference Signal (IRS) is available for PAL 625 line systems in the field-
blanking interval in the TV line 17 and additionally line 330. The IRS is according to EBU
Rec. R26-1981 (1995 edition) and serves to detect and correct distortion in TV signals, so
that the program signal may be restored to virtually its original form. This signal is mainly
used in television production installations.
Details IRS Line 17:
•
a luminance bar (reference white), amplitude 0.7 V.
•
a 2T sine-squared pulse, Half Amplitude Duration (HAD) 200 ns.
•
a modulated 20T pulse, HAD 2 µs.
•
a 5 step staircase luminance signal, 140 mV per step.
Figure 4-113. IRS Line 17 (PAL 625 Line System)
Operating:
The IRS Line 17 signal can be switched on for all PAL 625 line systems independent of
the selected test patterns. The IRS signal, transmitted in the field-blanking interval, is not
visible on the TV screen. Select the IRS17 test pattern if the signal should be visible on TV
screen.
Switching on IRS Line 17:
•
Select the
video
menu
.
•
Select
Reference Line Off
by the
é
or
ê
softkey (F1, F2).
•
Press the
edit
softkey (F3).
The
Reference Line
popup menu appears.
•
Select
On
by the
é
or
ê
softkey (F1, F2).
•
Press the
enter
softkey (F5).
The IRS signal in TV lines 17 and 330 is switched on. The
video
menu shows
Reference
Line On
.
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