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參數(shù)資料
| 型號(hào)： | VPX3214C |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Video Pixel Decoders |
| 中文描述： | 視頻解碼器像素 |
| 文件頁(yè)數(shù)： | 8/80頁(yè) |
| 文件大小： | 752K |
| 代理商： | VPX3214C |
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VPX 3220 A, VPX 3216 B, VPX 3214 C
PRELIMINARY DATA SHEET
MICRONAS INTERMETALL
8
2.2.3. Chrominance Filter
The demodulation is followed by a lowpass filter for the
color difference signals for PAL/NTSC. SECAM requires
a modified lowpass function with a bell-filter characteris-
tic. At the output of the lowpass filter, all luma information
is eliminated.
The lowpass filters are calculated in time multiplex for
the two color signals. Three bandwidth settings (narrow,
normal, broad) are available for each standard. The filter
passband can be shaped with an extra peaking term at
1.25 MHz.
dB
MHz
0
0
1
2
3
4
5
–10
–20
–30
–40
–50
dB
MHz
0
0
1
2
3
4
5
–10
–20
–30
–40
–50
PAL/
NTSC
SECAM
narrow
broad
normal
Fig. 2–4:
Frequency response of chroma filters
2.2.4. Frequency Demodulator
The frequency demodulator for demodulating the
SECAM signal is implemented as a CORDIC-structure.
It calculates the phase and magnitude of the quadrature
components by coordinate rotation.
The phase output of the CORDIC processor is differen-
tiated to obtain the demodulated frequency. After a pro-
grammable deemphasis filter, the Dr and Db signals are
scaled to standard C
r
C
b
amplitudes and fed to the cross-
over-switch.
dB
MHz
0
0.01
0.1
1.0
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
–11
Fig. 2–5:
Frequency response of SECAM
deemphasis
2.2.5. Burst Detection
In the PAL/NTSC-system, the burst is the reference for-
the color signal. The phase and magnitude outputs of
the CORDIC are gated with the color key and used for
controlling the phase-lock-loop (APC) of the demodula-
tor and the automatic color control (ACC) in PAL/NTSC.
The ACC has a control range of +30...–6 dB.
For SECAM decoding, the frequency of the burst is mea-
sured. Thus, the current chroma carrier frequency can
be identified and is used to control the SECAM proces-
sing. The burst measurements also control the color kill-
er operation.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VPX3224D | Video Pixel Decoders |
| VPX3224E | Video Pixel Decoders |
| VPX322XE | Video Pixel Decoders |
| VQ1000J | N-Channel Enhancement-Mode MOSFET Transistor(最小漏源擊穿電壓60V,夾斷電流0.225A的N溝道增強(qiáng)型MOSFET晶體管) |
| VQ1000J | N-Channel 60-V (D-S) MOSFET |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VPX3214C(PLCC44) | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Color Decoder Circuit |
| VPX3214C(QFP44) | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Color Decoder Circuit |
| VPX3216B | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Video Pixel Decoders |
| VPX3216B(PLCC44) | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Color Decoder Circuit |
| VPX3216B(QFP44) | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Color Decoder Circuit |
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