54200
Users Manual
4-54
DEM 2 (SECAM)
DEM 2 for SECAM is a full field pattern with a horizontal frequency sweep with 'bell
frequency’ as center frequency. The luminance is 50% and the chrominance is according
to the bell filter shape.
Chrominance subcarrier:
Start frequency 4.033 MHz
Center frequency 4.286 MHz
Stop frequency 4.56 MHz
Figure 4-84. DEM 2 (SECAM)
Applications:
Checks and adjustment of SECAM decoders, especially video de-emphasis and bell
filters (cloche).
In the receiver, after the antibell filter, the chrominance signal should have the same
amplitude in the active video part.
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