參數(shù)資料
型號: SAA7146A
廠商: NXP Semiconductors N.V.
英文描述: Multimedia bridge, high performance Scaler and PCI circuit SPCI
中文描述: 多媒體橋梁,高性能潔牙機和PCI電路SPCI
文件頁數(shù): 91/144頁
文件大?。?/td> 645K
代理商: SAA7146A
1998 Apr 09
91
Philips Semiconductors
Product specification
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
SAA7146A
Table 73
HPS, vertical scale and gain
Table 74
Prefilter selection for luminance component Y
OFFSET
(HEX)
NAME
BIT
TYPE
DESCRIPTION
64
PFY
31 to 28
RW
prefilter selection for luminance component Y
:
H(z) = H1(z)
×
H2(z)
×
H3(z)
H1, H3 = 1 + z
1
H2 = 1 + A
×
z
1
+ z
2
see Table 74
prefilter selection for colour difference signals UV
:
H(z) = H1(z)
×
H2(z)
×
H3(z)
H1 = 1 + z
1
H2 = 1 + A
×
z
1
+ z
2
H3 = 1 + z
2
see Table 75
reserved
DC gain control of Y scaler
:
Dependent on active coefficients and the sequence length, the
amplitude gain has to be renormalized.
Gain factor = 2 (DCGY + 1); see Table 76. The resulting factor is a
function of CYi and DCGY. The resulting weight factor = 0 for
CYAi = CYBi = 0 or CYAi = CYBi = 1 or DCGY >5 otherwise
weight = weighting factor/gain factor; see Table 77.
Coefficient select for Y (vertical) processing in accumulation mode.
For improvement of vertical filtering the accumulated lines can be
weighted. Weighting factor = 2(2
×
CYBi + CYAi
1); see Table 78.
PFUV
27 to 24
RW
23 to 19
18 to 16
DCGY
RW
CYA
CYB
15 to 8
7 to 0
RW
RW
PFY1
PFY0
PFY1
PFY0
H1
H2
H3
A
X
X
X
0
0
1
1
X
X
X
0
1
0
1
0
0
1
1
1
1
1
0
1
0
1
1
1
1
bypass
active
active
active
active
active
active
bypass
bypass
bypass
active
bypass
bypass
active
bypass
bypass
active
active
bypass
active
active
X
X
X
2
15
16
7
8
3
4
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