參數(shù)資料
型號(hào)： 935262922557
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝： PLASTIC, SOT-322, QFP-160
文件頁數(shù)： 139/147頁
文件大?。?/td> 526K
代理商： 935262922557
1998 Apr 09
91
Philips Semiconductors
Product specication
Multimedia bridge, high performance
Scaler and PCI circuit (SPCI)
SAA7146A
Table 73 HPS, vertical scale and gain
Table 74 Prelter selection for luminance component Y
OFFSET
(HEX)
NAME
BIT
TYPE
DESCRIPTION
64
PFY
31 to 28
RW
prelter selection for luminance component Y:
H(z) = H1(z)
× H2(z) × H3(z)
H1, H3 = 1 + z1
H2 =1+A
× z1 +z2
see Table 74
PFUV
27 to 24
RW
prelter selection for colour difference signals UV:
H(z) = H1(z)
× H2(z) × H3(z)
H1 =1+z1
H2 =1+A
× z1 +z2
H3 =1+z2
see Table 75
23 to 19
reserved
DCGY
18 to 16
RW
DC gain control of Y scaler:
Dependent on active coefcients 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.
CYA
15 to 8
RW
Coefcient select for Y (vertical) processing in accumulation mode.
For improvement of vertical ltering the accumulated lines can be
weighted. Weighting factor = 2(2
× CYBi + CYAi 1); see Table 78.
CYB
7 to 0
RW
PFY1
PFY0
PFY1
PFY0
H1
H2
H3
A
X
0
bypass
X
0
1
active
bypass
X
1
0
active
bypass
active
X
0011
active
2
0111
active
bypass
15
16
1011
active
bypass
active
7
8
1111
active
3
4
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