4 ms·
It turns out the microphone modules used in smartphones have integrated preamp and ADC circuitry which needs to be powered. This makes a lot of sense as mobile
by sjwright 7y ago
It turns out the microphone modules used in smartphones have integrated preamp and ADC circuitry which needs to be powered.
This makes a lot of sense as mobile phones are an extremely hostile RF environment. If it were any other way, the phone's sound inputs would be flooded with that iconic "cell phone interference" sound.
Old but still interesting:
https://www.ifixit.com/Teardown/iPhone+4+Microphone+Teardown/3473 https://www.ifixit.com/Teardown/iPhone+4+Microphone+Teardown...