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参数资料
| 型号： | TVP5040PFP |
| 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： | POWER, PLASTIC, TQFP-80 |
| 文件页数： | 18/101页 |
| 文件大小： | 464K |
| 代理商： | TVP5040PFP |
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2–7
2.2.3.2 Adaptive Comb Filter
Y/C separation may be done using adaptive 3-line (2-H delay), fixed 3-line, fixed 2-line comb filters, or a chroma trap
filter as shown in Figure 2–10. 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 3
×3 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 shown in Figure 2–11. 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 cut off. 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 degrees
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 trap filters are used which are shown in Figures 2–12 to 2–14.
TI’s patented adaptive comb filter algorithm reduces artifacts such as hanging dots at 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.
Line
Delay
ADAPTIVE COMB FILTER
IN
Luma
Comb
Adaptive Comb
Filter Algorithm
>> 1
+
>> 1
+
Line
Delay
>> 1
+
Comb12
Comb123
Comb23
Comb13
Comb Bypass
Chroma
Comb
Filter Select
Comb_EN
Adap_EN
Figure 2–10. 3-Line Adaptive Comb Filtering
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| TVP5041PFP | COLOR SIGNAL DECODER, PQFP80 |
| TVP5146M1PFP | COLOR SIGNAL DECODER, PQFP80 |
| TVP5146M2IPFPR | COLOR SIGNAL DECODER, PQFP80 |
| TVP5146M2IPFP | COLOR SIGNAL DECODER, PQFP80 |
| TVP5146M2PFPR | COLOR SIGNAL DECODER, PQFP80 |
相关代理商/技术参数 |
参数描述 |
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| TVP5145 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:NTSC/PAL/SECAM/Component Digital Video Decoder With Macrovision(TM) Detection |
| TVP5145EVM | 制造商:Texas Instruments 功能描述:TVP5145EVM - Bulk |
| TVP5145PFP | 功能描述:视频 IC NTSC/PAL/SECAM/ Comp Dig Vid Dec 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 |
| TVP5146 | 制造商:TI 制造商全称:Texas Instruments 功能描述:NTSC/PAL / SECAM 4 X 10 BIT DIGITAL VIDEO DECODER WITH MACROVISION DETECTION YPBPR/RGB INPUTS 5 LINE COMB FILTER AND SCART SUPPORT |
| TVP5146_12 | 制造商:TI 制造商全称:Texas Instruments 功能描述:NTSC/PAL/SECAM 4x10-Bit Digital Video Decoder With Macrovision?￡a Detection, YPbPr/RGB Inputs, 5-Line Comb Filter, and SCART Support |
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