3 ms·
The implication is that the microphone emits completely no signal without power and doesn't have any capacitor to last even a few seconds. Surely the most valu
by jojobas 6y ago
The implication is that the microphone emits completely no signal without power and doesn't have any capacitor to last even a few seconds.
Surely the most valuable data is just after the mute is turned on?
- mlyle 6y agoThere's no massive electrolytic capacitor that would be needed to power it for a few seconds. It's gonna be pretty damn fast. Standard ceramic decoupling cap-- very likely 0.1uF-- right next to it. 1/2 C V^2 at 3.3V is 0.5 microjoules. If the entire energy in the capacitor can go to effectively power the microphone (it can't), and the typical power consumption of a MEMS microphone is about 1 milliwatt, it might keep working for about 500 microseconds.