VPC3233D Просмотр технического описания (PDF) - Micronas

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VPC3233D

Comb Filter Video Processor

Micronas 

VPC 323xD

PRELIMINARY DATA SHEET

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.

CVBS

8

Notch

filter

Chroma

Process.

a) conventional

Y

CrC b

Luma

8

chroma

8

Chroma

Process.

b) S-VHS

Y

CrC b

CVBS

Notch

Y

8

filter

Chroma

Process.

1H

Delay

c) compensated

CrCb

CVBS

8

1H

Delay

Notch

filter

Y

Chroma

Process.

d) comb filter

Fig. 2–6: NTSC color decoding options

CrC b

CVBS

8

Notch

filter

Luma

8

Chroma

Process.

1H

Delay

a) conventional

Chroma

8

Chroma

Process.

1H

Delay

b) S-VHS

Fig. 2–7: PAL color decoding options

Y

CrC b

Y

CrC b

CVBS

8

Notch

filter

Chroma

Process.

1H

Delay

MUX

Fig. 2–8: SECAM color decoding

Y

CrC b

12

Micronas

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