SAA7108AE PHILIPS [NXP Semiconductors], SAA7108AE Datasheet - Page 62
SAA7108AE
Manufacturer Part Number
SAA7108AE
Description
HD-CODEC
Manufacturer
PHILIPS [NXP Semiconductors]
Datasheet
1.SAA7108AE.pdf
(197 pages)
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Remark: Due to bandwidth considerations XPSC[5:0] and
XACL[5:0] can be chosen differently to the previously
mentioned equations or Table 25, as the horizontal phase
scaling is able to scale in the range from zooming up by
factor 3 to downscaling by a factor of
Figs 35 and 36 show some frequency characteristics of
the prescaler.
Table 25 shows the recommended prescaler
programming. Other programming, than given in Table 25,
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:
Table 24 FIR prefilter functions
2004 Jun 29
CONT[7:0]
2
DC gain = (XC2_1 + 1)
HD-CODEC
XDCG[2:0]
PFUV[1:0] A2H[7:6]
PFY[1:0] A2H[5:4]
=
DC gain
SATN[7:0]
00
01
10
11
=
XACL[5:0] + (1
lower integer of
1024
8191
--------------------------------- -
DC gain 64
XC2_1).
.
2
XDCG[2:0]
LUMINANCE FILTER
1 1 1.75 4.5 1.75 1 1
COEFFICIENTS
bypassed
1 2 2 2 1
1 2 1
62
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 the luminance 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 33 and 34 show the frequency characteristics of the
selectable FIR filters.
SAA7108AE; SAA7109AE
CHROMINANCE COEFFICIENTS
3 8 10 8 3
bypassed
1 2 2 2 1
1 2 1
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