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參數(shù)資料
| 型號(hào)： | TDA4688 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Video processor with automatic cut-off control |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 文件頁(yè)數(shù)： | 17/24頁(yè) |
| 文件大小： | 130K |
| 代理商： | TDA4688 |
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1997 Jun 23
17
Philips Semiconductors
Product specification
Video processor with automatic cut-off control
TDA4688
Table 3
Demodulator axes and amplification factors
Table 4
PAL/SECAM and NTSC matrix; note 1
Note
1.
PAL/SECAM signals are matrixed by the equation: V
G
Y
=
0.51V
R
Y
0.19V
B
Y
NTSC signals are matrixed by the equations (hue phase shift of
2 degrees):
V
R
Y*
= 1.39V
R
Y
0.07V
B
Y
; V
G
Y*
=
0.46V
R
Y
0.15V
B
Y
; V
B
Y*
= V
B
Y
In the matrix equations: V
R
Y
and V
B
Y
are conventional PAL demodulation axes and amplitudes at the output of
the NTSC demodulator. V
G
Y*
, V
R
Y*
and V
B
Y*
are the NTSC modified colour difference signals; this is equivalent
to the demodulator axes and amplification factors shown in Table 3.
PARAMETER
NTSC
0
°
95
°
240
°
1.59
2.03
0.606
PAL
0
°
90
°
236
°
1.14
2.03
0.698
(B
Y)* demodulator axis
(R
Y)* demodulator axis
(G
Y)* demodulator axis
(R
Y)* amplification factor
(B
Y)* amplification factor
(G
Y)* amplification factor
MATRIX
NMEN
PAL/SECAM
NTSC
0
1
Fig.6 Cut-off measurement pulse.
(1) Maximum brightness.
(2) Nominal brightness.
handbook, full pagewidth
MHA697
cut-off measurement line
for red signal
ultra-black
(1)
(2)
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