Microphone, scientific name is microphone, translated from English microphone (microphone), also known as microphone, microphone. A microphone is an energy conversion device that converts sound signals into electrical signals. There are moving coil, condenser, electret and recently emerging silicon microphones, as well as liquid microphones and laser microphones. Most microphones are electret condenser microphones, which work by using polymer materials with permanent charge isolation. The diaphragm of the diaphragm condenser microphone is mostly polyperfluoroethylene propylene, which has good humidity performance and generates more surface charges. , is less affected by humidity. Since this microphone is also a capacitive structure, the internal resistance of the signal is very large. In order to draw out and amplify the voltage