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

Progressive scan

Progressive scan conversion produces a double number

of lines per field on the output. The field frequency is not

changed, while the line frequency is doubled.

Processing for progressive scan is different for two

successive output fields, e.g. the first output field has a

median operation on the odd lines, while the second has

the median operation on the even lines.

PROGRESSIVE SCAN CONVERSION

NON-INTERLACE MODE

With non-interlaced progressive scan output, line flicker is

removed because interlace is removed.

INTERLACE MODE

With interlaced progressive scan the output line structure

and line flicker is less visible (projection TV).

handbook, full pagewidth

output

1fH, 1fv

fieldA

1

frame1

fieldB

2

fieldA

3

frame2

fieldB

4

fieldA

5

output

2fH, 1fv

median

median

median

median

fieldA fieldB

1

1, 2

frame1, 1

fieldB

2

fieldA

2,3

frame1, 2

fieldA fieldB

3

3, 4

frame2, 1

fieldB fieldA

4

4,5

frame2, 2

a. Non-interlaced output; (625/50/1:1) or (525/60/1:1):

frame1, 1

frame1, 2

frame2, 1

b. Interlaced output; (1250/50/2:1) or (1050/60/2:1):

frame2, 2

1996 Oct 25

fieldA

1,1

frame1

fieldB

1,2

fieldA

2,1

frame2

fieldB

2,2

MGE028

Fig.5 Progressive scan conversion.

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