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)： 10/32頁(yè)
文件大小： 179K
代理商： SAA4970T
1996 Oct 25
10
Philips Semiconductors
Preliminary specification
Economical video processing IC
(ECOBENDIC)
SAA4970T
Fig.9
Peaking transfer function with variation of
β
(
α
=
1
2
).
(1)
β
=
1
2
.
(2)
β
=
1
4
.
(3)
β
=
1
8
.
(4)
β
= 0.
handbook, halfpage
0
0
2
4
6
8
10
12
14
1/4fs
1/2fs
MGE099
IH_PeakingI
(dB)
(1)
(2)
(3)
(4)
Fig.10 Peaking transfer function with variation of
β
(
α
= 0).
(1)
β
=
1
2
.
(2)
β
=
1
4
.
(3)
β
=
1
8
.
handbook, halfpage
0
0
2
4
6
8
10
1/4fs
1/2fs
MGE100
IH_PeakingI
(dB)
(1)
(2)
(3)
P
HASE COMPENSATION
Fig.11 Phase spectrum of NLP filter transfer
function.
(1)
λ
= 0.
(2)
λ
=
1
8
.
(3)
λ
=
1
4
.
(4)
λ
=
1
2
.
handbook, halfpage
0
0.125
0.25
0.5
MGE101
0.375
1/2
π
π
Φ
nlp
(f/fs)
f/fs
(1)
(2)
(3)
(4)
To compensate for a non-linear phase characteristic
before the A/D converter, this filter will compensate such
behaviour with a pulse response of [
λ
, 1 +
λ
].
λ
can be
programmed for the values 0,
1
8
,
1
4
and
1
2
.
An 8-bit word width is re-obtained by means of clipping at
0 and 255.
F
RAMING AND BLANKING
Blanking is done with switching Y to value 16 and UV to
value 0 (in twos complement) on command of the BL
signal.
Framing is done by switching Y and the higher nibble of U
and V to certain programmable values (frame Y and
frame UV) on command of the signal KAD.
If the pixel repetition function is chosen the last values from
the video remain repeated instead of the fixed values.
The range of the output signal Y
O
can be selected between
8 and 9 bits. In case of 8 bits for the nominal signal there
is room left for under and overshoot (adding up to a total of
9 bits); in case of selecting all 9 bits of the luminance D/A
converter for the nominal signal any under or overshoot
will be clipped.
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