參數(shù)資料
型號(hào)： TVP5031
廠商： Texas Instruments, Inc.
英文描述： NTSC/PAL VIDEO DECODER
中文描述： NTSC / PAL視頻解碼器
文件頁(yè)數(shù)： 23/85頁(yè)
文件大?。?/td> 378K
代理商： TVP5031
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 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 2–10. 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
>> 1
+
Line
Delay
>> 1
>> 1
+
+
Comb12
Comb123
Comb23
Comb13
Comb Bypass
Chroma
Comb
Filter Select
Comb_EN
Adap_EN
Figure 2–9. 3-Line Adaptive Comb Filtering
相關(guān)PDF資料
PDF描述
TVP5031TQFP NTSC/PAL VIDEO DECODER
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TVR4J TOSHIBA Fast Recovery Diode Silicon Diffused Type High Speed Rectifier Applications (fast recovery)
TVR4N TOSHIBA Fast Recovery Diode Silicon Diffused Type High Speed Rectifier Applications (fast recovery)
TVU001 14 pin DIP, 5.0 Volt, HCMOS/TTL, Clock Oscillator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TVP5031CPFP 制造商:TI 制造商全稱:Texas Instruments 功能描述:Color Decoder Circuit
TVP5031PFP 功能描述:IC 9-BIT VIDEO DECODER 80-QFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799
TVP5031TQFP 制造商:TI 制造商全稱:Texas Instruments 功能描述:NTSC/PAL VIDEO DECODER
TVP5040 制造商:TI 制造商全稱: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 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799
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