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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 signal generated by the sound, the output end must also use a field effect transistor. The horn is divided into several different musical instruments, one is a wind instrument, which is thin on the top and thick on the bottom, and is mostly made of copper. The other is a modern electro-acoustic component, which is used to convert electrical signals into sound, also called speakers. It can also be used to describe someone who advocates and promotes for others. The speaker is actually a conversion device that converts electrical energy into sound. When different electronic energy is transmitted to the coil, the coil generates an energy that interacts with the magnetic field of the magnet. This interaction causes the paper plate to vibrate, because the electronic energy changes at any time. The coil of the horn will move forward or backward, so the paper plate of the horn will follow the movement, which changes the density of the air and produces sound.