參數(shù)資料
型號: TVP5040CPFP
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): 28/109頁
文件大?。?/td> 568K
代理商: TVP5040CPFP
2–9
2.2.4
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 2–15 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 2–16, Figure 2–17, and Figure 2–18 show the characteristics of the peaking filter at four different gain settings
programmable via the host port.
Bandpass
Filter
x
Gain
Peaking
Filter
IN
+
OUT
Delay
Figure 2–15. Luminance Edge-Enhancer Peaking Block Diagram
f – Frequency – MHz
–1
0
1
2
3
4
5
6
7
01234567
Gain = 0
Gain = 2
Gain = 1
Gain = 0.5
f = 2.40 MHz
Amplitude
dB
f – Frequency – MHz
–1
0
1
2
3
4
5
6
7
01234567
Gain = 0
Gain = 2
Gain = 1
Gain = 0.5
f = 2.64 MHz
Amplitude
dB
Figure 2–16. Peaking Filter Response, NTSC
and PAL-M Square Pixel Sampling
Figure 2–17. Peaking Filter Response,
13.5 MHz Sampling Rate
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