1. According to the principle of energy conversion, it can be divided into electrical digital microphones, capacitive digital microphones, electromagnetic digital microphones, piezoelectric digital microphones, and semiconductor digital microphones;
2. According to the directionality of the received sound waves, they can be divided into non directionality and directionality. Directional digital microphones include heart-shaped directivity, strong directivity, and bidirectional directivity;
3. It can be divided into stereo, close-up speakers, wireless microphones, etc.

Dynamic digital microphones are commonly used microphones. It mainly consists of vibrating diaphragm, voice coil, permanent magnet, and step-up transformer. Its working principle is that when people speak into the microphone, the vibrating film vibrates back and forth with the sound, driving the voice coil to cut off the magnetic field lines. According to the principle of electromagnetic induction, an induced audio electromotive force is generated at both ends of the coil, thereby completing the conversion of sound and electricity. In order to increase the output induced electromotive force and impedance of the microphone, a step-up transformer is also required. This utility model has a simple structure, reliable stability, convenient use, and low inherent noise.