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參數(shù)資料
| 型號(hào)： | VDP3108 |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 英文描述： | Single-Chip Video Processor |
| 中文描述： | 單芯片視頻處理器 |
| 文件頁數(shù)： | 8/61頁 |
| 文件大小： | 2638K |
| 代理商： | VDP3108 |
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VDP 3108
ADVANCE INFORMATION
MICRONAS INTERMETALL
8
2.2. Color Decoder
In this block the entire luma/chroma separation and multi
standard color demodulation is carried out. The color de-
modulation uses an asynchronous clock, thus allowing
a unified architecture for all color standards.
Both luma and chroma are processed to an orthogonal
sampling raster. Luma and Chroma delays are matched.
The total delay of the decoder is adjustable by a FIFO
memory. Thus, including the delay of the display proces-
sing, exactly 64
μ
sec processing delay can be obtained.
The output of color decoder is YC
r
C
b
in a 4:2:2 format.
2.2.1. IF-Compensation
With off-air or mistuned reception any attenuation at
higher frequencies or asymmetry around the color sub-
carrier is compensated. Three different settings of the
IF-compensation are possible:
flat (no compensation)
6 dB /octave
12 dB /octave
Fig. 2–4:
Frequency response of chroma IF-com-
pensation
2.2.2. Demodulator
The entire signal (which might still contain luma) is now
quadrature-mixed to the baseband. The mixing frequen-
cy is equal to the subcarrier for PAL and NTSC, thus
achieving the chroma demodulation. For SECAM, the
mixing frequency is 4.286 MHz giving the quadrature
baseband components of the FM modulated chroma.
After the mixer, a lowpass filter selects the chroma com-
ponents; a downsampling stage converts the color dif-
ference signals to a multiplexed half rate data stream.
The subcarrier frequency in the demodulator is gener-
ated by direct digital synthesis; therefore substandards
such as PAL 3.58 or NTSC 4.43 can also be demodu-
lated.
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 bell-filter characteristic.
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. 2–5:
Frequency response of chroma fil-
ters
2.2.4. Frequency Demodulator
The frequency demodulator for demodulating the SE-
CAM 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.
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相關(guān)代理商/技術(shù)參數(shù) |
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