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参数资料
| 型号： | TVP5147PFPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 颜色信号转换 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP80 |
| 封装： | GREEN, PLASTIC, HTQFP-80 |
| 文件页数： | 12/100页 |
| 文件大小： | 1465K |
| 代理商： | TVP5147PFPRG4 |
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Functional Description
12
SLES099C—March 2007
TVP5147PFP
The 10-bit composite video is multiplied by the subcarrier signals in the quadrature demodulator to generate
color difference signals U and V. The U and V signals are then sent to low-pass filters to achieve the desired
bandwidth. An adaptive 5-line comb filter separates UV from Y based on the unique property of color phase
shifts from line to line. The chroma is remodulated through a quadrature modulator and subtracted from
line-delayed composite video to generate luma. This form of Y/C separation is completely complementary,
thus there is no loss of information. However, in some applications, it is desirable to limit the U/V bandwidth
to avoid crosstalk. In that case, notch filters can be turned on. To accommodate some viewing preferences,
a peaking filter is also available in the luma path. Contrast, brightness, sharpness, hue, and saturation controls
are programmable through the host port.
Line
Delay
–
Peaking
NTSC/PAL
Remodulation
NTSC/PAL
Demodulation
Notch
Filter
Color LPF
↓ 2
5-Line
Adaptive
Comb
Filter
Notch
Filter
Notch
Filter
Notch
Filter
Contrast
Brightness
Saturation
Adjust
Cr
Y
Cb
Y
Burst
Accumulator
(U)
U
SECAM
Color
Demodulation
V
Delay
CVBS/Y
SECAM Luma
CVBS
CVBS/C
Color LPF
↓ 2
Burst
Accumulator
(V)
U
V
Delay
Figure 23. Composite and S-Video Processing Block Diagram
2.2.2.1
Color Low-Pass Filter
High filter bandwidth preserves sharp color transitions and produces crisp color boundaries. However, for
nonstandard video sources that have asymmetrical U and V side bands, it is desirable to limit the filter
bandwidth to avoid UV crosstalk. The color low-pass filter bandwidth is programmable to enable one of the
three notch filters. Figure 24 through Figure 27 represent the frequency responses of the wideband color
low-pass filters.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TVP5150 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW POWER VIDEO DECODER WITH SCALING |
| TVP5150A | 制造商:TI 制造商全称:Texas Instruments 功能描述:Ultralow Power NTSC/PAL/SECAM Video Decoder With Robust Sync Detector |
| TVP5150AEVM | 功能描述:视频 IC 开发工具 Video Decoder Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Boards 类型:YPbPr to RGBHV Converters 工具用于评估:LMH1251 工作电源电压:5 V |
| TVP5150AM1 | 制造商:Texas Instruments 功能描述:Ultra-low Power Video Decoder TVP5150AM1 |
| TVP5150AM1-EP | 制造商:TI 制造商全称:Texas Instruments 功能描述:Ultralow-Power NTSC/PAL/SECAM Video Decoder |
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