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| 型號(hào)： | 935262451557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號(hào)轉(zhuǎn)換 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP100 |
| 封裝： | 14 X 14 X 1.40 MM, PLASTIC, SOT-407, LQFP-100 |
| 文件頁(yè)數(shù)： | 83/144頁(yè) |
| 文件大小： | 592K |
| 代理商： | 935262451557 |
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2000 Mar 15
43
Philips Semiconductors
Preliminary specication
PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC
comb lter, VBI-data slicer and high performance scaler
SAA7114H
Remark: Due to bandwidth considerations XPSC[5:0] and
XACL[5:0] can be chosen different to the previous
mentioned equations or Table 11, as the H-phase scaling
is able to scale in the range from zooming up by factor 3 to
down-scale by a factor of 1024
8191.
Figs 26 and 27 show some resulting frequency
characteristics of the prescaler.
Table 11 shows the recommended prescaler
programming. Other programmings, than documented in
Table 11, may result in better alias suppression, but the
resulting DC gain amplification needs to be compensated
by the BCS control, according to the equation:
Where:
2XDCG[2:0]
≥ DC gain
DC gain = (XC2_1 + 1)
× XACL[5:0] + (1 XC2_1).
For example, if XACL[5:0] = 5, XC2_1 = 1, then
DC gain = 10 and the required XDCG[2:0] = 4.
The horizontal source acquisition timing and the
prescaling ratio is identical for both luminance path and
chrominance path, but the FIR filter settings can be
defined differently in the two channels.
Fade-in and fade-out of the filters is achieved by copying
an original source sample each as first and last pixel after
prescaling.
Figs 24 and 25 show the frequency characteristics of the
selectable FIR filters.
CONT[7:0]
SATN[7:0]
lower integer of
2
XDG[2:0]
DC gain
64
×
----------------------------------
==
Table 10 FIR prelter functions
PFUV[1:0]A2H[7:6]
PFY[1:0]A2H[5:4]
LUMINANCE FILTER COEFFICIENTS
CHROMINANCE COEFFICIENTS
00
bypassed
01
121
10
1 1 1.75 4.5 1.75 1 1
3 81083
11
12221
handbook, full pagewidth
MHB543
V
(dB)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
f_sig/f_clock
(1)
(2)
(3)
42
39
36
33
30
27
24
21
18
15
12
9
6
3
0
6
3
Fig.24 Luminance prefilter characteristic.
(1) PFY[1:0] = 01.
(2) PFY[1:0] = 10.
(3) PFY[1:0] = 11.
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