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Question about video projectors

seriously disabled
in Engineering

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I didn't know where to put it but I think it belongs best to electronics.

 

In How a Projector works? they write that the composite video and S-video signals are routed to a Video Decoder circuit. Most digital projectors include a video decoder and a light engine. The video decoder converts video data received by the projector into pixel and color data.

 

My question is: How exactly does the video decoder do this conversion?

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