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Comment by hn_go_brrrrr | Hacker News Reader

Any speaker is also a microphone, so the ANC mic is probably not required.

For simple audio devices, maybe with a hardware revision, but it's unlikely the driver circuitry would be routed back to an analog sensing pin unless you were doing some closed loop feedback stuff

IIRC some Realtek cards did have the hardware to route it that way.

I mean you can literally plug a regular pair of headphones into a microphone port instead of a speaker port, then yell into them, and it'll record your voice.

But yes the Google buds are Bluetooth and use separate microphones to send recorded audio back to the device for voice calls, etc.

The idea is to use both the speaker and the microphone at the same time.

I'm not aware of anyone doing that with a single electromagnet and 2 wires.

A speaker is a microphone in the same way that a bicycle is a motorbike.

You don't need any mods to make a speaker act as a microphone... Just like an LED doesn't need any mods to be a light sensor

Not to the driver/microphone, but you do need to mod the circuitry it was attached to. And amplifier isn’t magically pre-amp.

I've tried it many times with many kinds of headphobes and it was always plug and play without any modifications.

Same with an alternator... Pretty sure it can be used both ways... The circuit can do both if designed right... That's childs play

When we were kids, it was common knowledge and cheaper to use headphones as a mic. Just plug headphones into mic jack and they work as mic.

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