a transducer or sensor that converts sound waves into an electrical signal that allows one to capture and record sound

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Dealing with microphone echo?

Here is my setup: Macmini Genius 120-degree webcam with internal mic 55" LED TV We're using this for video conferencing, remote code review. So we're doing a lot of work with other people outside ...
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headphone jack for early 2008 macbook air (1,1)

is the headphone jack on this mba a TRRS one, i.e. does it also work with iphone-like microphone + headphone set? can you point to some official source?