參數資料
型號: 935077580157
廠商: NXP SEMICONDUCTORS
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP80
封裝: PLASTIC, SOT-318, QFP-80
文件頁數: 28/30頁
文件大小: 230K
代理商: 935077580157
1996 Oct 25
7
Philips Semiconductors
Preliminary specication
Progressive scan-Zoom and Noise
reduction IC (PROZONIC)
SAA4990H
FUNCTIONAL DESCRIPTION
Field rate up-conversion with line icker 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.
DEFINITIONS
Framel: l is the number of an input/output frame
temporarily combinating an A and B field.
: 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.
: 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.
Field
n
x
Field
n, m
x
Fig.3 Generation of
(median filter).
field
n, m
B
handbook, halfpage
MGE026
t
y
frame l, k = 1
fieldA
n
fieldB
m
frame l, k = 2
fieldB
n,m
fieldA
m,n
Fig.4 Scan rate up-conversion.
handbook, full pagewidth
MGE027
input
1fH, 1fv
output
2fH, 2fv
frame1, 1
frame1, 2
frame2, 1
fieldA
4, 3
fieldB
3, 4
fieldA
3
fieldA
3
fieldB
2
fieldB
2
fieldA
2, 1
fieldB
1, 2
fieldA
1
fieldA
1
fieldB
4
fieldB
4
frame2, 2
frame1
median
frame2
median
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