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ADV7179 Display Two Images

Thread Summary

The user asked if a design using Hisilicon SOC to output HDMI, converted to BT656 by ADV7604, and then to CVBS by ADV7179 is feasible. The final answer indicates that the ADV7179 cannot support progressive modes (720x480P30, 720x576P25) and only interlaced modes (480i, 576i) are supported for CVBS and S-Video output. The issue of two images appearing is likely due to the unsupported progressive modes.
AI Generated Content

Hello;

We encountered the following problems in developing our product; could you help take a look, please?

The HDMI signal output by Hisilicon SOC is transmitted to ADV7604 and converted to BT656, and then input to ADV7179 and converted to CVBS signal output. May I ask if such a scheme is feasible?

And the Hisilicon SOC could not output 720x480P30 or 720x576P25 HDMI signals, it can only output 720x480P60 and 720x576P50 HDMI formats. Finally we tested and found that the signal output of ADV7179 had problems and showed two images.

If there is a problem with this design, any method to solve it?

Many thanks;

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