參數(shù)資料
型號: TVP5146PFPR
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: GREEN, PLASTIC, HTQFP-80
文件頁數(shù): 24/109頁
文件大?。?/td> 1658K
代理商: TVP5146PFPR
13
SLES084C August 2007
TVP5146
2.2.2.1
Color Low-Pass Filter
High filter bandwidth preserves sharp color transitions and produces crisp color boundaries.
However, for video sources that have asymmetrical U and V side bands, it is desirable to limit
the filter bandwidth to avoid UV crosstalk. The color low-pass filter bandwidth is programmable
to enable one of the three notch filters. Figure 24 through Figure 27 represent the frequency
responses of the wideband color low-pass filters.
Figure 24. Color Low-Pass Filter Frequency
Response
Figure 25. Color Low-Pass Filter With Filter
Frequency Response, NTSC Square Pixel
Sampling
f – Frequency – MHz
70
60
50
40
30
20
10
0
10
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
PAL SQP –3 dB
@ 1.55 MHz
NTSC SQP –3 dB
@ 1.29 MHz
ITU-R BT.601 –3 dB
@ 1.42 MHz
Amplitude
dB
f – Frequency – MHz
70
60
50
40
30
20
10
0
10
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Amplitude
dB
Filter 0
–3 dB @ 1.29 MHz
Filter 1
–3 dB
@ 936 kHz
Filter 3
–3 dB @ 504 kHz
Filter 2
–3 dB @ 767 kHz
70
60
50
40
30
20
10
0
10
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Figure 26. Color Low-Pass Filter With Filter
Characteristics, NTSC/PAL ITU-R BT.601
Sampling
Figure 27. Color Low-Pass Filter With Filter
Characteristics, PAL Square Pixel Sampling
f – Frequency – MHz
70
60
50
40
30
20
10
0
10
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Amplitude
dB
Filter 3
–3 dB @ 554 kHz
Filter 2
–3 dB @ 844 kHz
Filter 1
–3 dB
@ 1.03 MHz
Filter 0
–3 dB @ 1.41 MHz
f – Frequency – MHz
Amplitude
dB
Filter 3
–3 dB
@ 605 kHz
Filter 0
–3 dB @ 1.55 MHz
Filter 2
–3 dB @ 922 kHz
Filter 1
–3 dB
@ 1.13 MHz
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