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参数资料
| 型号： | TVP5154PNPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 颜色信号转换 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP128 |
| 封装： | PLASTIC, HTQFP-128 |
| 文件页数： | 76/77页 |
| 文件大小： | 795K |
| 代理商： | TVP5154PNPG4 |
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4.2 Composite Processing Block Diagram
4.3 Adaptive Comb Filtering
4.4 Color Low-Pass Filter
4.5 Luminance Processing
4.6 Chrominance Processing
TVP5154
4-CHANNEL LOW-POWER PAL/NTSC/SECAM VIDEO DECODER
WITH INDEPENDENT SCALERS AND FAST LOCK
SLES163A – MARCH 2006 – REVISED JULY 2006
When switching CVBS inputs from one input to the other, the AGC settings are internally stored and the
previous settings for the new input are restored. This eliminates flashes and dark frames associated with
switching between inputs that have different signal amplitudes.
The ADC has nine bits of resolution and runs at a maximum speed of 27 MHz. The clock input for the
ADC comes from the PLL.
The composite processing block processes NTSC/PAL/SECAM signals into the YCbCr color space.
Figure 2-1 shows the basic architecture of this processing block.
Figure 2-1 shows the luminance/chrominance (Y/C) separation process in the TVP5154 decoders. The
composite video is multiplied by sub-carrier signals in the quadrature modulator to generate the color
difference signals Cb and Cr. Cb and Cr are then low pass (LP) filtered to achieve the desired bandwidth
and to reduce crosstalk.
An adaptive 4-line comb filter separates CbCr from Y. Chroma is remodulated through another quadrature
modulator and subtracted from the line-delayed composite video to generate luma. Contrast, brightness,
hue, saturation, and sharpness (using the peaking filter) are programmable via I2C.
The Y/C separation is bypassed for S-video input. For S-video, the remodulation path is disabled.
The 4-line comb filter can be selectively bypassed in the luma or chroma path. If the comb filter is
bypassed in the luma path, chroma notch filters are used. TI’s patented adaptive 4-line comb filter
algorithm reduces artifacts, such as hanging dots at color boundaries, and detects and properly handles
false colors in high-frequency luminance images, such as a multiburst pattern or circle pattern.
In some applications, it is desirable to limit the Cb/Cr bandwidth to avoid crosstalk. This is especially true
in the case of video signals that have asymmetrical Cb/Cr sidebands. The color LP filters provided limit the
bandwidth of the Cb/Cr signals.
Color LP filters are needed when the comb filtering turns off, due to extreme color transitions in the input
image. Refer to Chrominance Control #2 Register, for the response of these filters. The filters have three
options that allow three different frequency responses based on the color frequency characteristics of the
input video.
The luma component is derived from the composite signal by subtracting the remodulated chroma
information. A line delay exists in this path to compensate for the line delay in the adaptive comb filter in
the color processing chain. The luma information is then fed into the peaking circuit, which enhances the
high-frequency components of the signal, thus, improving sharpness.
For NTSC/PAL formats, the color processing begins with a quadrature demodulator. The Cb/Cr signals
then pass through the gain control stage for chroma saturation adjustment. An adaptive comb filter is
applied to the demodulated signals to separate chrominance and eliminate cross-chrominance artifacts.
An automatic color-killer circuit is also included in this block. The color killer suppresses the chroma
processing when the color burst of the video signal is weak or not present. The SECAM standard is similar
to PAL except for the modulation of color, which is FM instead of QAM.
Functional Description
8
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相关代理商/技术参数 |
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| TVP5154PNPR | 功能描述:视频 IC 4Ch Lo Pwr PAL/NTSC SECAM Video Decoder 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 |
| TVP5154PNPRG4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:4-CHANNEL LOW-POWER PAL/NTSC/SECAM VIDEO DECODER WITH INDEPENDENT SCALERS AND FAST LOCK |
| TVP5156PNP | 功能描述:视频 IC 4Ch NTSC/PAL Video Decoder 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 |
| TVP5156PNPR | 功能描述:视频 IC 4Ch NTSC/PAL Video Decoder 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 |
| TVP5157PNP | 功能描述:视频 IC 4Ch NTSC/PAL Video Decoder 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 |
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