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When the mute is engaged, the output of the gate drops to 0V, and that is what goes to the SoC (after a divider, the SoC is probably 1.8V logic while the mics/AND are at 3.3V).
I traced the path from the hardware switch, through a filter/debounce network, to the AND gate, and from the mics to the AND gate. So unless there are backdoor buried traces that bypass this (which would be hard evidence of a backdoor, since they would make *no sense*), it's safe
![Adam [he/him]](https://pbs.twimg.com/profile_images/2328235588/mky7liyb93paqco9cfuk_normal.gif)
(correction, I meant PDM mics, not TDM; TDM is a different style, though PDM mics do time-division-multiplex the stereo channels, which is how I mixed it up)
Does the SoC have other sensors that can be used as mics, though?
Like what? The speaker is behind a power amp, it can't backfeed.
Why would you do this with an AND gate and not just just use the switch itself to cut/connect the mic? Much easier to show/verify it is hardware switched for anyone with basic understanding!
Because it's a multi-MHz digital signal and sending it to the switch could cause issues, because then you need *two* wires going off to the switch daughterboard, because the software also needs to know the switch state so now that's a DPDT switch. Plenty of reasons.
thanks for doing the hard yards. bullshit like this is just pointless and i dont get why someone would intentionally add noise to signal
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