Why do low-quality microphones hear the S and SH sounds as it was someone blowing/wind?

Question

Why do low-quality microphones hear the S and SH sounds as it was someone blowing/wind?

In: Technology

Answer 1

Ideally, a microphone only picks up the vibrations in the air produced by your speech. But in addition to vibrations, we also exhale and produce “wind” when we speak, with S and SH sounds producing sustained wind. That wind exerts a force on the microphone that disturbed its ability to detect vibrations. That’s why microphones often have a foam cover, it disperses wind while allowing vibration to enter.