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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)： | 26/92頁 |
| 文件大?。?/td> | 525K |
| 代理商： | TVP5145 |
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2
–
10
2.2.6
SECAM Processing
The SECAM standard is similar to PAL except for the modulation of color which is frequency modulation (FM) instead
of quadrature amplitude modulation (QAM). The color difference signals Db and Dr are transmitted on an alternating
line basis using two different color FM carrier frequencies: 4.25 MHz for Db (blue) and 4.40625 MHz for Dr (red). A
line reference signal which is transmitted during the back porch interval identifies the appropriate color signal.
Figure 2
–
19 is a block diagram of the processing data path for SECAM which decodes into YUV. Luma Y is generated
by filtering the chroma using a bandpass filter and then subtracting the chroma from the composite input. The delay
blocks compensate for delays in the filter and the chroma data path. The filtered chroma is then limited and filtered
by a bell filter. The bell filter emphasizes (amplifies) the FM carrier which was deemphasized (attenuated) by the
encoder prior to transmission. The bell filter output is then fed to the FM demodulator which outputs a scaled version
of UV. These scaled outputs are then converted to UV by the UV conversion block. The line ID block monitors the
FM demodulator outputs during the back porch interval so that the Db or Dr line can be identified. The video
deemphasis block attenuates the higher frequency components of the inputs which were emphasized (amplified) by
the encoder in order to improve SNR. Both the bell and the video deemphasis filters have a nonlinear phase
characteristic as required by the SECAM standard ITU-R BT.470. A line delay and two multiplexers demultiplex the
UV into separate cosited U and V outputs.
The frequency responses for the SECAM filters and FM demodulator characteristic are shown in Figure 2
–
20 for the
ITU-R BT.601 and square pixel sampling rates.
–
Y
Delay
Bandpass
Filter
Line
ID
Composite
Delay
Limit
Bell
Filter
FM
Demodulator
UV
Conversion
Video
Deemphasis
Line
Delay
U
V
Db Line
Db Line
Figure 2
–
19. SECAM Data Path
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相關代理商/技術參數(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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