1-22
INTRODUCTION
ORBAN MODEL 8600
In facilities that use PPMs that indicate level directly in dBu, maximum program and
line-up level is often +6dBu. Instantaneous peaks will reach +11dBu or more.
Transmission Levels
The transmission engineer is primarily concerned with the peak level of a program
to prevent overloading or over-modulation of the transmission system. This peak
overload level is defined differently, system to system.
Figure 1-1: Common Audio Meter Scales, Aligned to the Same Reference Level
Figure 1-2: Absolute Peak Level, VU and PPM Indications
-20
-10
-7
-5
-3
-2
-1
0
+1
+2
+3
-60
-50
-45
-40
-35
-30
-25
-20
-6
-2
0
-4
-8
-10
-15
-12
-10
-8
-6
-4
-2
0
+8
+12
14
+10
+6
+4
+2
1
2
3
4
6
7
5
-50
-30
-5
+5
-40
0
-10
-20
-36
-24
-18
-12
-6
+6
+12
TEST
-42
0 dBFS
Reference
-20 dBFS
HEADROOM
Содержание OPTIMOD-FM 8600
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