ADV7482&TP2825开发之总结

本文总结了使用ADV7482与TP2825进行CVBS视频解码的经验,介绍了配置像素时钟、有效像素范围等关键参数的方法,并强调了频率设置的重要性。

ADV7482&TP2825开发之总结

这一两个月在项目里接触到了两个视频解码芯片,主要是使用了两颗芯片的CVBS(NTSC)解码功能。外接CVBS Video接入解码芯片,芯片8位并行输出端口输出BT565标准的数字视频,再交给SoC处理,最终将视频投影到LCD面板上。
在此总结下,解码CVBS视频时的套路(就是通用配置)。
1.像素时钟,可以根据具体的解析度和帧率算出;
2.V/H Active Line/Pixel,该配置调整Video的有效像素范围,即显示画面大小;
3.V/H Delay Line/Pixel,该配置调整Video显示起始点位置;
4.Total Pixels Per Line,该配置指明每一行的总像素个数;
5.Format,CVBS主要有NTSC和PAL两种制式,所以还需要注意格式配置;
6.还有一些其他诸如亮度,色相,对比度等配置就不说了。

通过项目开发,我意识到频率的重要性,只有正确的频率才能让两个芯片协同起来。

转载于:https://www.cnblogs.com/zhanghang-BadCoder/p/7880555.html

TP2915 is a video D/A solution for converting HD digital video signal into the analog domain that is suitable for transmission over single coaxial or twist-pair cable over long reach. The major application is the Automotive interconnect between HD display and HD camera systems or any other applications require robust and low cost transmission of HD video. TP2915 generates the analog video signal complying with HD Transport Video Interface (HD-TVI) format. It is one form of the HD composite video format that is widely adopted in the industry. TP2915 can support a variety of video resolution digital video input standards in 422 or 444 formats over 8, 16 or 24-bit interface with the embedded synchronization (EAV/SAV) header or explicit sync signals. It also accepts 24-bit RGB input with external sync signals. It has the built-in sync extraction logic to obtain the sync information inside the video stream. The video resolutions supported range from SD (NT/PAL) to UHD. TP2915 contains a versatile video timing generator that is programmable for all standards supported and other non-standard video formats. It has programmable clip/shift/scale function to proper condition the input video signal for further processing. It also has an optional 2x over-sampling filters built-in to support higher output sample rate. Over-sampling can relax the external analog filter requirement. TP2915 supports selectable current mode and voltage mode output as well as internal programmable analog reconstruction filter. The built-in data slicer help minimize glue circuits. The signal amplitude of the DAC output can be set by external current setting resistor. It also has built-in color bar test pattern generator for easy testing and adjustment. TP2915 has built-in clock jitter reduction circuit based on local crystal clock to ensure the output signal performance.
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