54200
Users Manual
4-52
DEM 1 (SECAM)
W = White, Y = Yellow, C = Cyan, G = Green
M = Magenta, R = Red, B = Blue, Bk = Black
Figure 4-80. DEM 1 (SECAM)
DEM 1 for SECAM is a test pattern divided into six horizontal bars.
•
Bar 1 contains a 161 mV chrominance signal with the bell-filter center frequency
4.286 MHz.
•
Bar 2 shows a color bar pattern with reduced primary color signal levels 30/0/30/0:
White, Yellow, Cyan, Green, Magenta, Red, Blue, and Black.
•
Bar 3 and 4 show similar color bars with standard primary color signal levels
75/0/75/0. Bar 3 starts with White, Bar 4 with Magenta.
•
Bar 5 shows magenta followed by a 75% reference white.
•
Bar 6 shows a 100% reference white.
Applications:
This pattern is sufficient to check and adjust SECAM demodulators, bell filters, and the
burst keying.
•
Bar 1 is used for bell filter adjustment and checking the demodulator.
•
Bar 2 to 4 serves for color representation.
•
Bar 5 is used to check the burst keying. When the burst keying is wrong the white
area will have color errors.
•
Bar 6 serves as standard white pattern.
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