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参数资料
| 型号： | TVP5031PFP |
| 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： | 16/92页 |
| 文件大小： | 415K |
| 代理商： | TVP5031PFP |
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2–7
2.2.2.2 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 2–9. 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 fewer 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 2–10. 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 2–11 to 2–13.
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 2–9. 3-Line Adaptive Comb Filtering
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TVP5031TQFP | 制造商:TI 制造商全称:Texas Instruments 功能描述:NTSC/PAL VIDEO DECODER |
| TVP5040 | 制造商:TI 制造商全称:Texas Instruments 功能描述:NTSC/PAL Digital Video Decoder With Macrovision Detection |
| TVP5040CPFP | 功能描述:IC NTSC/PAL VIDEO DECODER 80TQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 编码器，解码器，转换器 系列:- 产品变化通告:Development Systems Discontinuation 26/Apr/2011 标准包装:1 系列:- 类型:编码器 应用:DVB-S.2 系统 电压 - 电源，模拟:- 电压 - 电源，数字:- 安装类型:- 封装/外壳:模块 供应商设备封装:模块 包装:散装 其它名称:Q4645799 |
| TVP5040CPFPG4 | 功能描述:IC NTSC/PAL VIDEO DECODER 80TQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 编码器，解码器，转换器 系列:- 产品变化通告:Development Systems Discontinuation 26/Apr/2011 标准包装:1 系列:- 类型:编码器 应用:DVB-S.2 系统 电压 - 电源，模拟:- 电压 - 电源，数字:- 安装类型:- 封装/外壳:模块 供应商设备封装:模块 包装:散装 其它名称:Q4645799 |
| TVP5040EVM | 制造商:Texas Instruments 功能描述:EVAL BD TVP5040EVM USER S GUIDE - Bulk |
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