参数资料
型号: TVP5147PFP
厂商: TEXAS INSTRUMENTS INC
元件分类: 颜色信号转换
英文描述: COLOR SIGNAL DECODER, PQFP80
封装: GREEN, PLASTIC, HTQFP-80
文件页数: 15/100页
文件大小: 1465K
代理商: TVP5147PFP
Functional Description
14
SLES099C—March 2007
TVP5147PFP
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 28 through Figure 211. TI’s 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.
40
35
30
25
20
15
10
5
0
5
10
01234567
f Frequency MHz
No Notch Filter
Notch 2 Filter
Amplitude
dB
Figure 28. Chroma Trap Filter Frequency
Response, NTSC Square Pixel Sampling
Notch 1 Filter
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 29. Chroma Trap Filter Frequency
Response, NTSC ITU-R BT.601 Sampling
Notch 2 Filter
Notch 3 Filter
40
35
30
25
20
15
10
5
0
5
10
01234567
f Frequency MHz
40
35
30
25
20
15
10
5
0
5
10
01234567
Amplitude
dB
Figure 210. Chroma Trap Filter Frequency
Response, PAL ITU-R BT.601 Sampling
Figure 211. Chroma Trap Filter Frequency
Response, PAL Square Pixel Sampling
f Frequency MHz
Amplitude
dB
No Notch Filter
Notch 2 Filter
Notch 1 Filter
Notch 3 Filter
No Notch Filter
Notch 2 Filter
Notch 1 Filter
Notch 3 Filter
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