VSP9447B datasheet(12/126 Pages) MICRONAS

12 / 126 page

VSP 94x2A

DATA SHEET

Aug. 16, 2004; 6251-552-1DS

Micronas

2.1.6. Luminance Processing

A luminance notch filter is implemented to separate

the chroma information from the luminance. Depend-

ing on the color standard, one out of three different

notch characteristics is chosen (‘PAL’, ‘NTSC’,

‘SECAM’) automatically.

For PAL and Secam the respective notch filters have 5

different characteristics each. The luminance notch fil-

ter for NTSC can be set to 4 different filter response

curves. They can be selected by NTCHSEL. Alterna-

tively, no notch should be used for Y/C input

(NOTCHOFF). The filter characteristics can be found

in Figure 2–8. In SECAM operation, the notch filter can

be fixed to one frequency or toggle between 4.4 MHz

and 4.25 MHz depending on the transmitted color (Dr,

Db) (SECNTCH).

A simple lowpass-filter can be enabled by LPPOST to

further reduce high-frequency noise component from

the CVBS signal.

Fig. 2–8: Filter Characteristics for NTSC, PAL M and

PAL N

Fig. 2–9: Filter Characteristics for PAL B/G, NTSC44,

PAL60

Fig. 2–10: Filter Characteristics for SECAM

(SECNTCH=’01’, 4.25 MHz)

Fig. 2–11: Filter Characteristics for Y/C mode.

The black level can be shifted by the parameter

LMOFST. This is required to compensate 7.5 IRE off-

sets in some input signals (e.g. NTSC)

The positive or

negative offset is added to the Y signal before scaling.

Fig. 2–12: Adjustment of ‘Black’ to ‘Blankingvalue’ at

Analog Output.

3.58

0.5

1.5

2.5

3.5

4.5

5.5

characteristic for NTSC

frequency [MHz]

’x00’

NTCHSEL=

’x01’

’x10’

’x11’

4.43

0.5

1.5

2.5

3.5

4.5

5.5

characteristic for PAL

frequency [MHz]

NTCHSEL=

’000’

’100’

’010’

’011’

’001’

4.25

0.5

1.5

2.5

3.5

4.5

5.5

characteristic for SECAM (4.25 MHz)

frequency [MHz]

NTCHSEL=

’000’

’100’

’010’

’011’

’001’

0.5

1.5

2.5

3.5

4.5

5.5

characteristic for Y/C

frequency [MHz]

LPPOST=1

LPPOST=0

LMOFST='01'

LMOFST='11'

LMOFST='00'

LMOFST='10'

BLANKING BLACK

LMOFST='01'

LMOFST='11'

LMOFST='00'

LMOFST='10'

BLANKING

BLACK

Input signals without 7.5IRE offset

Input signals with 7.5IRE offset

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