參數(shù)資料
型號： SAF7118H
廠商： NXP Semiconductors N.V.
元件分類： 通用總線功能
英文描述： Multistandard video decoder with adaptive comb filter and component video input
封裝： SAF7118EH/V1<SOT807-1 (HBGA156)|<<http://www.nxp.com/packages/SOT807-1.html<1<,;SAF7118EH/V1<SOT807-1 (HBGA156)|<<http://www.nxp.com/packages/SOT807-1.html<1<,;
文件頁數(shù)： 50/175頁
文件大?。?/td> 898K
代理商： SAF7118H
SAF7118_4
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 04 — 4 July 2008
50 of 175
NXP Semiconductors
SAF7118
Multistandard video decoder with adaptive comb filter
8.4.2
Horizontal scaling
The overall horizontal required scaling factor has to be split into a binary and a rational
value according to the equation:
where the parameter of prescaler XPSC[5:0] = 1 to 63 and the parameter of VPD phase
interpolation XSCY[12:0] = 300 to 8191 (0 to 299 are only theoretical values). For
example,
1
3.5
is to split in
1
4
×
1.14286. The binary factor is processed by the prescaler,
the arbitrary non-integer ratio is achieved via the variable phase delay VPD circuitry,
called horizontal fine scaling. The latter calculates horizontally interpolated new samples
with a 6-bit phase accuracy, which relates to less than 1 ns jitter for regular sampling
scheme. Prescaler and fine scaler create the horizontal scaler of the SAF7118.
Using the accumulation length function of the prescaler (XACL[5:0] A1h[5:0]), application
and destination dependent (e.g. scale for display or for a compression machine), a
compromise between visible bandwidth and alias suppression can be determined.
8.4.2.1
Horizontal prescaler (subaddresses A0h to A7h and D0h to D7h)
The prescaling function consists of an FIR anti-alias filter stage and an integer prescaler,
which creates an adaptive prescale dependent low-pass filter to balance sharpness and
aliasing effects.
The FIR prefilter stage implements different low-pass characteristics to reduce alias for
downscales in the range of 1 to
1
2
. A CIF optimized filter is built-in, which reduces
artefacts for CIF output formats (to be used in combination with the prescaler set to
1
2
scale); see
Table 11
.
The function of the prescaler is defined by:
An integer prescaling ratio XPSC[5:0] A0h[5:0] (equals 1 to 63), which covers the
integer downscale range 1 to
1
63
An averaging sequence length XACL[5:0] A1h[5:0] (equals 0 to 63); range 1 to 64
A DC gain renormalization XDCG[2:0] A2h[2:0]; 1 down to
1
128
The bit XC2_1[A2h[3]], which defines the weighting of the incoming pixels during the
averaging process:
–
XC2_1 = 0
1 + 1...+ 1 + 1
–
XC2_1 = 1
1 + 2...+ 2 + 1
The prescaler creates a prescale dependent FIR low-pass, with up to (64 + 7) filter taps.
The parameter XACL[5:0] can be used to vary the low-pass characteristic for a given
integer prescale of
1
XPSC[5:0]
. The user can therefore decide between signal bandwidth
(sharpness impression) and alias.
Equation for XPSC[5:0] calculation is:
H-scale ratio
input pixel
---------------------------
=
H-scale ratio
1
XPSC[5:0]
--------------------------
1024
XSCY[12:0]
-----------------------------
×
=
XPSC[5:0]
lower integer ofNpix_in
Npix_out
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAF7118H/V1,557 功能描述:視頻 IC COMPONENT VID DECODR RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAF7129AH 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital video encoder
SAF7129AH/V1 功能描述:視頻 IC 6 DAC VIDEO ENCODER RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAF7129AH/V1,518 功能描述:視頻 IC 6 DAC VIDEO ENCODER RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAF7129AH/V1,557 功能描述:視頻 IC 6 DAC VIDEO ENCODER RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
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