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plusvic / simplebus2-intercom

General description of the Simplebus2 protocol used by some Comelit's intercoms. Hardware for retransmitting Simplebus2 messages over UART.
Creative Commons Zero v1.0 Universal
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Audio/Video capture and emission #6

Closed FilippoPiazza closed 1 year ago

FilippoPiazza commented 1 year ago

Hello, very nice project. Do you by chance have figured out how the audio is managed on the bus? What about the video?

plusvic commented 1 year ago

Audio/Video is transmitted as an analog signal, specifically some kind of composite video. I'm not an expert, so I don't really understand the details.

FilippoPiazza commented 1 year ago

This is extremely helpful. Do you have any kind of documentation or is this your own conclusion?

plusvic commented 1 year ago

It's my own conclusion based on some signals I was able to capture with an oscilloscope. The signals looked like this https://hackaday.com/2018/01/18/know-your-video-waveform/. So, I'm pretty sure its some sort of composite video. I also researched a little bit and learned that there are some ICs specifically designed for decoding these signals (example), but that's beyond my expertise level.

FilippoPiazza commented 1 year ago

Thanks a lot