參數(shù)資料
型號: TVP5031PFP
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): 17/92頁
文件大?。?/td> 415K
代理商: TVP5031PFP
2–8
f – Frequency – MHz
–40
–35
–30
–25
–20
–15
–10
–5
0
5
10
01234567
No Notch Filter
Notch3 Filter
Notch1 Filter
Notch2 Filter
Amplitude
dB
f – Frequency – MHz
–60
–50
–40
–30
–20
–10
0
10
012
34
56
78
A
mp
li
tu
d
e
dB
0.5, 0, 0.5
0.5, 0.5, 0
0.25, 0.5, 0.25
Figure 2–10. Comb Filters Frequency
Response
Figure 2–11. Chroma Trap Filter Frequency
Response (NTSC Square Pixel Sampling)
f – Frequency – MHz
–40
–35
–30
–25
–20
–15
–10
–5
0
5
10
01234567
No Notch Filter
Notch3 Filter
Notch1 Filter
Notch2 Filter
f – Frequency – MHz
–40
–35
–30
–25
–20
–15
–10
–5
0
5
10
01234567
No Notch Filter
Notch1 Filter
Notch2 Filter
Notch3 Filter
Amplitude
dB
Amplitude
dB
Figure 2–12. Chroma Trap Filter Frequency
Response (13.5 MHz Sampling)
Figure 2–13. Chroma Trap Filter Frequency
Response (PAL Square Pixel Sampling)
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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