參數(shù)資料
型號: TVP5031TQFP
廠商: Texas Instruments, Inc.
英文描述: NTSC/PAL VIDEO DECODER
中文描述: NTSC / PAL視頻解碼器
文件頁數(shù): 24/85頁
文件大小: 378K
代理商: TVP5031TQFP
2–8
Figure 2–10. Comb Filters Frequency Response
f – Frequency – MHz
Figure 2–11. Chroma Trap Filter
Frequency Response
–40
–35
–30
–25
–20
–15
–10
–5
0
5
10
0
1
2
3
4
5
6
7
No Notch Filter
Notch3 Filter
Notch1 Filter
Notch2 Filter
A
f – Frequency – MHz
–60
–50
–40
–30
–20
–10
0
10
0
1
2
3
4
5
6
7
8
A
0.5, 0, 0.5
0.5, 0.5, 0
0.25, 0.5, 0.25
f – Frequency – MHz
–40
–35
–30
–25
–20
–15
–10
–5
0
5
10
0
1
2
3
4
5
6
7
No Notch Filter
Notch3 Filter
Notch1 Filter
Notch2 Filter
Figure 2–12. Chroma Trap Filter Frequency
Response (13.5 MHz Sampling)
f – Frequency – MHz
–40
–35
–30
–25
–20
–15
–10
–5
0
5
10
0
1
2
3
4
5
6
7
No Notch Filter
Notch1 Filter
Notch2 Filter
Notch3 Filter
A
Figure 2–13. Chroma Trap Filter Frequency
Response (PAL Square Pixel Sampling)
A
2.2.3
Luminance Processing
The digitized composite video signal passes through either a luminance comb filter or a chroma trap filter, either of
which removes chrominance information from the composite signal to generate a luminance signal. The luminance
signal is then fed to the input of a peaking circuit. Figure 2–14 illustrates the basic functions of the luminance data
path. High frequency components of the luminance signal are enhanced by a peaking filter (edge-enhancer).
Figure 2–15, Figure 2–16, and Figure 2–17 show the characteristics of the peaking filter at four different gain settings
programmable via the host port.
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