SAA4990H 查看數據表（PDF） - Philips Electronics

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SAA4990H

Progressive scan-Zoom and Noise reduction IC (PROZONIC)

Philips Electronics 

Philips Semiconductors

Progressive scan-Zoom and Noise

reduction IC (PROZONIC)

Preliminary specification

SAA4990H

FUNCTIONAL DESCRIPTION

Field rate up-conversion with line flicker reduction

The line flicker reduction in conjunction with field rate

up-conversion is performed by generating a 50 Hz

interlace on the 100 Hz field rate display. Median filtering

supplies the data for the interlaced output fields.

handbook, halfpage frame l, k = 1

fieldA

n

fieldB

n,m

frame l, k = 2

fieldA

m,n

fieldB

m

DEFINITIONS

Framel: l is the number of an input/output frame

temporarily combinating an A and B field.

Fieldnx : x is the field raster where A means an odd field and

B means an even field.

Framel, k: l is the number of an output frame temporarily

combinating an origin/interpolated A and B field;

k indicates the origin input field with

k = 1: odd input field and raster A

k = 2: even input field and raster B within framel.

Fieldnx, m : n, m = lines of fieldn, m are interpolated by

2 lines of fieldn and 1 line of fieldm using the median filter

(see Fig.3); x is the field raster where A means an odd field

and B means an even field.

t

y

MGE026

Fig.3 Generation of fieldnB, m (median filter).

handbook, full pagewidth

input

1fH, 1fv

fieldA

1

frame1

fieldB

2

fieldA

3

frame2

fieldB

4

output

2fH, 2fv

median

median

median

median

fieldA fieldB

1

1, 2

frame1, 1

fieldA

fieldB

2, 1

2

frame1, 2

fieldA fieldB

3

3, 4

frame2, 1

fieldA

fieldB

4, 3

4

frame2, 2

MGE027

1996 Oct 25

Fig.4 Scan rate up-conversion.

7

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