VPC3230D datasheet(12/78 Pages) MICRONAS

12 / 78 page

VPC 323xD, VPC 324xD

ADVANCE INFORMATION

Micronas

2.3.8. PAL Compensation/1-H Comb Filter

The color decoder uses one fully integrated delay line.

Only active video is stored.

The delay line application depends on the color stan-

dard:

–NTSC:

1-H comb filter or color compensation

– PAL:

color compensation

– SECAM: crossover-switch

In the NTSC compensated mode, Fig. 2–6 c), the color

signal is averaged for two adjacent lines. Thus,

cross-color distortion and chroma noise is reduced. In

the NTSC 1-H comb filter mode, Fig. 2–6 d), the delay

line is in the composite signal path, thus allowing

reduction of cross-color components, as well as

cross-luminance. The loss of vertical resolution in the

luminance channel is compensated by adding the ver-

tical detail signal with removed color information. If the

4H adaptive comb filter is used, the 1-H NTSC comb

filter has to be deselected.

Fig. 2–6: NTSC color decoding options

Fig. 2–7: PAL color decoding options

Fig. 2–8: SECAM color decoding

chroma

Notch

filter

Chroma

Process.

CVBS

1 H

Delay

CVBS

Chroma

Process.

Notch

filter

Chroma

Process.

Luma

C C

r b

C C

r b

C C

r b

Notch

filter

1 H

Delay

Chroma

Process.

CVBS

C C

r b

d) comb filter

c) compensated

a) conventional

b) S-VHS

Chroma

Notch

filter

1 H

Delay

Chroma

Process.

CVBS

Chroma

Process.

Luma

1 H

Delay

C C

r b

C C

r b

a) conventional

b) S-VHS

MUX

Notch

filter

1 H

Delay

Chroma

Process.

CVBS

C C

r b

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