Common microphones are divided into dynamic microphones and condenser microphones. Many common wired microphones are also dynamic microphones. The difference between a wireless dynamic microphone and a wired microphone is the wire. The wireless microphone realizes signal transmission through the wireless of different frequencies, and the wired microphone realizes signal transmission through the data line.
The so-called dynamic microphones (hereinafter referred to as dynamic microphones) and condenser microphones (hereinafter referred to as condenser microphones) refer to the types of microphone heads. Common microphones on the market are mainly divided into these two types. So what is the difference in the working principle of the two?
The dynamic microphone uses the principle of electromagnetic induction. The wire coil is mounted on the diaphragm and placed between the magnetic field of the magnet. As the sound pressure changes, it continuously moves in the magnetic field to generate an induced current, thereby converting the sound signal into an electrical signal. .
Its energy conversion principle is very similar to that of a speaker.
Condenser microphones use the principle of charging and discharging capacitors. The vibration of the sound drives one plate (ultra-thin metal film) of the capacitor. The vibration of this plate changes the distance between the two plates, which in turn changes the capacitance.
When the capacitance becomes larger, the power supply charges the capacitor; when the capacitance becomes smaller, the capacitor discharges, so that a current is generated in the circuit and the sound signal is converted into an electrical signal.