Complete noob here. I don't need a ready to implement solution, pointers on what to read upon and ideas for even simpler projects to gain experience first are perfectly fine.
I'm trying to feed both microphone and the right speaker of a motorcycle helmet intercom (Freedconn TCOM-SC) into the 3.5mm external microphone adapter of an action camera (Ghost Drift X). There's no ready to use solution for output from the intercom (it uses weird plug) so I need to tinker one out.
I got a "Y" headphones splitter that I can use to connect two microphones to the camera and record both simultaneously so I thought I could take that further, cut the splitter's input terminals off and tap into + and - on the intercom's speaker and microphone cables instead. However, after reading on how microphones and speakers work I realised there can be a huge difference in both voltage and current there. How do I match those? What are the terms I'm looking for and how do I Google for this specific subject (all I found in Google and here is how to match speakers to amplifiers)?