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参数资料
| 型号： | TVP5150PBSG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 颜色信号转换 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP32 |
| 封装： | GREEN, PLASTIC, TQFP-32 |
| 文件页数： | 3/27页 |
| 文件大小： | 453K |
| 代理商： | TVP5150PBSG4 |
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Detailed Description
7
SLES043 — September 2002
TVP5150
Line
Delay
–
Peaking
Quadrature
Modulation
Quadrature
Demodulation
Notch
Filter
Color LPF
↓ 2
3- or 4-Line
Adaptive
Comb
Filter
Burst
Accumulator
(V)
Notch
Filter
Notch
Filter
Notch
Filter
Delay
Contrast
Brightness
Saturation
Adjust
Delay
V
Y
U
UV
Y
Burst
Accumulator
(U)
U
Delay
V
+
Delay
X
Gain Factor
Bandpass
Peak
Detector
Composite
Color LPF
↓ 2
Figure 2–1. Composite Processing Block Diagram
2.5.1 Adaptive Comb Filtering
Y/C separation may be done using adaptive 4-line or 3-line (3-H or 2-H delay), fixed 3-line, fixed 2-line comb
filters, or a chroma trap filter as shown. Adaptive comb filtering is available for both luminance and
chrominance. The adaptive comb filter algorithm computes the vertical and horizontal contours of color based
on a block of 3x3 pixels.
If there is a sharp color transition, comb filtering is applied to the two lines that have less color changes. If there
is no color transition, 3-line comb filtering is used with a choice of filter coefficients [1/4, 1/2, 1/4] or [1/2, 0,
1/2] programmable via the host port. Characteristics of 2-line and 3-line comb filters are also shown. The filter
frequency plots show that both 2-line and 3-line (with filter coefficients [1/4, 1/2, 1/4]) comb filters have zeros
at 1/2 of the horizontal line frequency to separate the interleaved Y/C spectrum in NTSC. The 3-line comb filter
has less cross-luma and cross-chroma noise due to slightly sharper filter cutoff. The 3-line comb filter with filter
coefficients [1/2, 0, 1/2] has two zeros at 1/4 and 3/4 of the horizontal line frequency. This should be used for
PAL only because of its 90 degree U/V phase shifting from line to line. The comb filter can be selectively
bypassed in the luma or chroma path. If the comb filter is bypassed in the luma path, then chroma notch filters
are used (next section). TI’s patented adaptive comb filter algorithm reduces artifacts, such as hanging dots
at the color boundary, and detects and properly handles false colors in high-frequency luminance images such
as a multiburst pattern or circle pattern. Adaptive comb filtering is the recommended mode of operation.
相关PDF资料 |
PDF描述 |
|---|---|
| TVP5150PBS | COLOR SIGNAL DECODER, PQFP32 |
| TVP5150PBSR | COLOR SIGNAL DECODER, PQFP32 |
| TVP5151IPBSQ1 | COLOR SIGNAL DECODER, PQFP32 |
| TVP5151IPBSRQ1 | COLOR SIGNAL DECODER, PQFP32 |
| TVP5151IPBSR | COLOR SIGNAL DECODER, PQFP32 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TVP5150PBSR | 功能描述:视频 IC Very Low Power Video Decoder RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| TVP5150PBSRG4 | 制造商:Texas Instruments 功能描述: |
| TVP5151 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Ultralow-Power NTSC/PAL/SECAM Video Decoder |
| TVP5151EVM | 功能描述:视频 IC 开发工具 TVP5151 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 |
| TVP5151IPBS | 功能描述:视频 IC UltraLo-Pwr NTSC/ RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
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