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參數(shù)資料
| 型號： | TVP5040PFP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP80 |
| 封裝： | POWER, PLASTIC, TQFP-80 |
| 文件頁數(shù)： | 17/101頁 |
| 文件大小： | 464K |
| 代理商： | TVP5040PFP |
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2–6
2.2.3.1 Color Low-Pass Filter
Color low-pass filter frequency responses are shown in Figures 2–6 to 2–9. High filter bandwidth preserves sharp
color transitions and produces crisp color boundaries. However for nonstandard video sources that have
asymmetrical U and V side bands, it is desirable to limit the filter bandwidth to avoid UV crosstalk. Color low-pass
filter bandwidth is programmable by enabling one of the three notch filters.
f – Frequency – MHz
–70
–60
–50
–40
–30
–20
–10
0
10
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
PAL SQP –3 dB
@ 1.33 MHz
NTSC SQP –3 dB
@ 1.11 MHz
CCIR 601 –3 dB
@ 1.22 MHz
Amplitude
–
dB
f – Frequency – MHz
–70
–60
–50
–40
–30
–20
–10
0
10
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Amplitude
–
dB
No Notch Filter
–3 dB @ 1.11 MHz
Notch1 Filter –3
dB @ 798 kHz
Notch3 Filter –3
dB @ 454 kHz
Notch2 Filter –3
dB @ 664 kHz
COLOR LOW-PASS FILTER FREQUENCY RESPONSE
COLOR LOW-PASS FILTER WITH NOTCH
FILTER FREQUENCY RESPONSE
(NTSC and PAL-M SQUARE PIXEL SAMPLING)
Figure 2–6
Figure 2–7
f – Frequency – MHz
–70
–60
–50
–40
–30
–20
–10
0
10
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Amplitude
–
dB
No Notch Filter
–3 dB @ 1.22 MHz
Notch3 Filter –3
dB @ 499 kHz
Notch2 Filter –3
dB @ 730 kHz
Notch1 Filter –3
dB @ 878 kHz
f – Frequency – MHz
–70
–60
–50
–40
–30
–20
–10
0
10
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Amplitude
–
dB
No Notch Filter
–3 dB @ 1.33 MHz
Notch3 Filter –3
dB @ 545 kHz
Notch2 Filter –3
dB @ 798 kHz
Notch1
Filter –3 dB
@ 959 kHz
COLOR LOW-PASS FILTER WITH
NOTCH FILTER CHARACTERISTICS
(13.5 MHZ SAMPLING)
COLOR LOW-PASS FILTER WITH
NOTCH FILTER FREQUENCY RESPONSE
(PAL SQUARE PIXEL SAMPLING)
Figure 2–8
Figure 2–9
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