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參數(shù)資料
| 型號： | HMP8170EVAL1 |
| 廠商： | Intersil Corporation |
| 英文描述： | NTSC/PAL Video Encoder |
| 中文描述： | NTSC / PAL視頻編碼器 |
| 文件頁數(shù)： | 8/33頁 |
| 文件大?。?/td> | 407K |
| 代理商： | HMP8170EVAL1 |
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8
.
Color Subcarrier Generation
The HMP8170 uses a numerically controlled oscillator
(NCO) clocked by CLK2 and a sine look up ROM to
generate the color subcarrier. As shown in Figure 9, the
phase increment value (PHINC) of the NCO may come from
the encoder’s internal look up table, BT.656 ancillary data, or
a control register. The PHINC source is selected in timing
I/O register 2.
.
FIGURE 7A. FULL SPECTRUM
FIGURE 7B. PASS BAND
FIGURE 7. Y LOWPASS FILTER RESPONSE
NTSC SQUARE PIXEL
CLK2 = 24.54MHz
NTSC OR PAL
RECTANGULAR PIXEL
CLK2 = 27.00MHz
PAL SQUARE PIXEL
CLK2 = 29.50MHz
0
-10
-20
-30
-40
-50
-60
0
2
4
6
8
10
12
14
FREQUENCY (MHz)
A
0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
0
1
2
3
4
5
6
7
A
FREQUENCY (MHz)
NTSC SQUARE PIXEL
CLK2 = 24.54MHz
NTSC OR PAL
RECTANGULAR PIXEL
CLK2 = 27.00MHz
PAL SQUARE PIXEL
CLK2 = 29.50MHz
FIGURE 8A. FULL SPECTRUM
FIGURE 8B. PASS BAND
FIGURE 8. Cb AND Cr LOWPASS FILTER RESPONSE
0
2
4
6
8
10
12
FREQUENCY (MHz)
0
-10
-20
-30
-40
-50
-60
A
NTSC SQUARE PIXEL
CLK2 = 24.54MHz
NTSC OR PAL
RECTANGULAR PIXEL
CLK2 = 27.00MHz
PAL SQUARE PIXEL
CLK2 = 29.50MHz
0
0.2
0.4
0.6
FREQUENCY (MHz)
0.8
1.0
1.2
0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
A
NTSC SQUARE PIXEL
CLK2 = 24.54MHz
NTSC OR PAL
RECTANGULAR PIXEL
CLK2 = 27.00MHz
-3.5
-4.0
1.4
1.6
PAL SQUARE PIXEL
CLK2 = 29.50MHz
FIGURE 9. COLOR SUBCARRIER GENERATION NCO.
+
INTERNAL
BT.656
I
2
C
PHINC
SELECT
PHINC
D
Q
CLK2
NCO RESET
PHINT
HMP8170
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|---|---|
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