參數(shù)資料
型號(hào): TVP5147M1PFPG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 顏色信號(hào)轉(zhuǎn)換
英文描述: COLOR SIGNAL DECODER, PQFP80
封裝: PLASTIC, HTQFP-80
文件頁數(shù): 15/100頁
文件大?。?/td> 1369K
代理商: TVP5147M1PFPG4
Functional Description
13
SLES140A—March 2007
TVP5147M1PFP
Figure 24. Color Low-Pass Filter Frequency
Response
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
ITU-R BT.601 3 dB
@ 1.42 MHz
Amplitude
dB
Figure 25. Color Low-Pass Filter With Filter
Characteristics, NTSC/PAL ITU-R BT.601
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
2.2.2.2
Y/C Separation
Y/C separation can be done using adaptive 5-line (5-H delay) comb filters or a chroma trap filter. The comb
filter can be selectively bypassed in the luma or chroma path. If the comb filter is bypassed in the luma path,
then chroma trap filters are used which are shown in Figure 26 and Figure 27. The TI patented adaptive
comb filter algorithm reduces artifacts such as hanging dots at color boundaries. It detects and properly
handles false colors in high-frequency luminance images such as a multiburst pattern or circle pattern.
f Frequency MHz
40
35
30
25
20
15
10
5
0
5
10
01234567
No Notch Filter
Notch 3 Filter
Notch 1 Filter
Amplitude
dB
Figure 26. Chroma Trap Filter Frequency
Response, NTSC ITU-R BT.601 Sampling
Notch 2 Filter
40
35
30
25
20
15
10
5
0
5
10
01234567
Figure 27. Chroma Trap Filter Frequency
Response, PAL ITU-R BT.601 Sampling
f Frequency MHz
Amplitude
dB
No Notch Filter
Notch 2 Filter
Notch 1 Filter
Notch 3 Filter
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