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參數(shù)資料
| 型號： | TVP5145 |
| 英文描述： | NTSC/PAL/SECAM/Component Digital Video Decoder With Macrovision(TM) Detection |
| 中文描述： | 的NTSC / PAL / SECAM制式/分量數(shù)字視頻解碼器通過Macrovision（TM）的檢測 |
| 文件頁數(shù)： | 20/92頁 |
| 文件大?。?/td> | 525K |
| 代理商： | TVP5145 |
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2
–
4
CH1 A/D
Luma/Composite
Decimation
Filter
M
u
x
Chroma
Decimation
Filter
M
u
x
CH2 A/D
Input Multiplexer
Figure 2
–
3. Digital Input Multiplexer
2.2.2
Decimation Filter
Digitized composite, S-video, or component video at twice the PCLK rate first passes through decimation filters that
reduce the data rate from twice the PCLK rate to the PCLK rate. The decimation filter is a half-band filter whose
frequency response is shown in Figure 2
–
4. For applications that can not tolerate any high frequency droop,
decimation filters can be bypassed via the host port. Oversampling and decimation filtering can effectively increase
the overall signal-to-noise ratio by 3 dB. This advantage is lost if the decimation filter is bypassed.
Frequency
–
MHz
–
60
–
50
–
40
–
30
–
20
–
10
0
10
0
1
2
3
4
5
6
7
8
PAL SQP
–
3 dB at 6.66 MHz
ITU-R BT.601
–
3 dB at 6.10 MHz
NTSC SQP
–
3 dB at 5.54 MHz
A
–
Figure 2
–
4. Decimation Filter Frequency Response
2.2.3
Y/C Separation
Figure 2
–
5 illustrates the luminance/chrominance (Y/C) separation process in the TVP5145 device. Ten-bit
composite video is multiplied by subcarrier signals in the quadrature modulator to generate the color difference
signals U and V. U and V are then low-pass filtered. An adaptive 3- or 4-line comb filter separates UV from Y based
on the unique property of color phase shift from line to line. Chroma is remodulated through another quadrature
modulator and subtracted from line-delayed composite video to generate luma. This form of Y/C separation is
completely complementary, thus loses no information. However, in some applications, it is desirable to limit the U/V
bandwidth. In that case, notch filters can be turned on. To accommodate some viewing preferences, a peaking filter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TVP5145EVM | 制造商:Texas Instruments 功能描述:TVP5145EVM - Bulk |
| TVP5145PFP | 功能描述:視頻 IC NTSC/PAL/SECAM/ Comp Dig Vid Dec RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| TVP5146 | 制造商:TI 制造商全稱: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 制造商全稱: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 |
| TVP5146EVM | 功能描述:視頻 IC 開發(fā)工具 TVP5146 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Boards 類型:YPbPr to RGBHV Converters 工具用于評估:LMH1251 工作電源電壓:5 V |
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