参数资料
型号: TVP5151PBS
厂商: TEXAS INSTRUMENTS INC
元件分类: 颜色信号转换
英文描述: COLOR SIGNAL DECODER, PQFP32
封装: GREEN, PLASTIC, QFP-32
文件页数: 3/85页
文件大小: 958K
代理商: TVP5151PBS
TVP5151
www.ti.com
SLES241D – SEPTEMBER 2009 – REVISED MARCH 2011
Figure 3-2. Chrominance Trap Filter Frequency
Figure 3-3. Chrominance Trap Filter Frequency
Response, NTSC ITU-R BT.601 Sampling
Response, PAL ITU-R BT.601 Sampling
3.4
Color Low-Pass Filter
In some applications, it is desirable to limit the Cb/Cr bandwidth to avoid crosstalk. This is especially true
in 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. See Section 3.21.25, 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 as shown in Figure 3-4.
Figure 3-4. Color Low-Pass Filter with Filter Characteristics, NTSC/PAL ITU-R BT.601 Sampling
Copyright 2009–2011, Texas Instruments Incorporated
Functional Description
11
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