參數(shù)資料
型號(hào)： SAA4970T
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Economical video processing IC ECOBENDIC
中文描述： SPECIALTY CONSUMER CIRCUIT, PDSO56
封裝： PLASTIC, SOT-190-1, VSOP-56
文件頁(yè)數(shù)： 9/32頁(yè)
文件大小： 179K
代理商： SAA4970T
1996 Oct 25
9
Philips Semiconductors
Preliminary specification
Economical video processing IC
(ECOBENDIC)
SAA4970T
P
EAKING
Peaking is implemented to obtain a higher gain in the
middle and upper ranges of the luminance bandwidth.
The filtering is an addition of:
the original signal
the original signal band-passed with centre
frequency =
1
4
f
s
the original signal high-passed with maximum gain at
frequency =
1
2
f
s
.
The band-passed and high-passed signals are weighted
with factors 0,
1
8
,
1
4
and
1
2
. The impulse response
becomes [
α
,
β
, 1 + 2
α
+ 2
β
,
β
,
α
], where
α
is the
band-pass weighting factor and
β
the high-pass weighting
factor.
Coring is added to obtain no gain for low amplitudes in the
(high-pass + band-pass) signal, which is then considered
to be noise. Coring levels can be programmed as 0 (
off
),
+1/
2, +3/
4 and +7/
8 LSB at 10-bit word.
A limiter brings back the 11-bit range to a 9-bit range with
a clipping function on the lower and upper side.
Fig.7
Peaking transfer function with variation of
β
(
α
=
1
8
).
(1)
β
=
1
2
.
(2)
β
=
1
4
.
(3)
β
=
1
8
.
(4)
β
= 0.
handbook, halfpage
0
0
2
4
6
8
10
1/4fs
1/2fs
MGE097
IH_PeakingI
(dB)
(1)
(2)
(3)
(4)
Fig.8
Peaking transfer function with variation of
β
(
α
=
1
4
).
(1)
β
=
1
2
.
(2)
β
=
1
4
.
(3)
β
=
1
8
.
(4)
β
= 0.
handbook, halfpage
0
0
2
4
6
8
10
1/4fs
1/2fs
MGE098
IH_PeakingI
(dB)
(1)
(2)
(3)
(4)
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