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How easy is it, from electrical standpoint, to convert from HDMI to VGA?
by listic 16y ago
How easy is it, from electrical standpoint, to convert from HDMI to VGA?
- deleted 16y ago[deleted]
- InclinedPlane 16y agoIt's not possible, there is no such conversion. VGA is an analog signal. HDMI is pure digital. The reason people might be mislead into thinking this is possible is because you can convert VGA to DVI and you can convert DVI to HDMI with nothing more than a simple adapter for each. But there's a problem with this. DVI has two forms: digital DVI (DVI-D) which is signal compatible with HDMI, and analog DVI (DVI-A) which is signal compatible with VGA but not at all compatible with HDMI. Thus in order to convert VGA to HDMI you would need not merely a cable adapter but a converter box.
- aidenn0 16y agoFalse. You can convert from digital to analog: VGA graphics cards do this. You would need a full-fledged signal processor to do this, but I could imagine a box that did this (I could definitely build one myself, but I'm not strong enough in analog electronics to say with confidence that it would work at higher pixel frequencies; I've never done a project with analog signals over 100MHz) [edit] So to answer the grandparent, it is possible; such a box would be expensive (read definitely more than $10, possibly a lot more) though.
- faragon 16y agoCan be done on 10$ (flow shop, >100k units (?)): ASIC or system on chip including three ADC, memory for one row (e.g. 2048*3 bytes) and a PLL clock generator for matching DVI serial port clock. Any electronic engineer in the room for PLA prototype cost estimation?
- zokier 16y agoLuckily the Chinese are already on it: http://www.dealextreme.com/details.dx/sku.37081 http://www.dealextreme.com/details.dx/sku.37081 edit: iirc at least TI had some HDMI receiver chips that are able to output something nice and analog, if you want a more DIY solution. No need for custom chips anyway.
- InclinedPlane 16y agoRead the last sentence of my post. There's no passive way to do it, you need a converter box, as I mentioned. Thanks for paying attention.