3 ms·
To wear a tinfoil hat for a moment: > The SOC (system on chip) controller seems to be connected to the flip flop resets > The 'mute' button appears to be ver
by jstanley 6y ago
To wear a tinfoil hat for a moment:
> The SOC (system on chip) controller seems to be connected to the flip flop resets
> The 'mute' button appears to be very real and functional. When the button glows 'red' the power is removed from the microphones.
Does the microphone take any time to boot up? How far could a malicious SoC get by toggling "reset" on and off very fast? If you toggle the microphone on and off at 96kHz with e.g. a 1% duty cycle, then you'd be able to sample the level from the microphone at 96kHz, and the LED would still be glowing at 99% of its usual current (which would be visually indistinguishable from 100%). This would allow the SoC to record audio at full quality, and still leave the LED glowing.
- _flux 6y agoSo I picked the very first mems microphone datasheet my ddg gave me: https://www.st.com/resource/en/datasheet/mp34dt06j.pdf https://www.st.com/resource/en/datasheet/mp34dt06j.pdf ..and it says 10 ms max turn on time, so 100 Hz. Of course, a typical or minimum turn on time could be better, but I imagine it it were better, it would be advertised as well.
- danhor 6y agoThe reset stays. If the soc toggles the reset line, the microphone stays on and the led turns off, until the user presses the mute button