The difference between microphone and wireless microphone

Microphone, whose scientific name is microphone, is an energy conversion device that converts sound signals into electrical signals. It is translated from Microphone. Also called microphone and microphone. In the twentieth century, microphones developed from acoustic-electric conversion through resistance to inductive and capacitive conversion. A large number of new microphone technologies were gradually developed, including microphones such as aluminum ribbons and moving coils, as well as the widely used condenser microphones and electrets. Body microphone.

　　 Microphone classification

According to the sound-electric conversion principle, it is divided into: electric type (moving coil type, aluminum ribbon type), condenser microphone type (DC polarization type), piezoelectric type (crystal type, ceramic type), electromagnetic type, carbon particle type, semiconductor式等。 Equations and so on.

　　According to the sound field force, it is divided into: pressure type, differential pressure type, combined type, linear type, etc.

　　 is divided into wired and wireless according to the transmission method of electric signal.

　　 is divided into: measuring microphone, vocal microphone, instrument microphone, recording microphone, etc. according to purpose.

　　 is divided into cardioid, sharp heart, super cardioid, two-way (8-shaped), non-directional (omnidirectional) according to the directivity.

　　Electret microphones are small in size and low in cost, and are widely used in telephones, mobile phones and other equipment.

　　The silicon micro microphone is based on CMOSMEMS technology and has a smaller volume. Its consistency will be more than 4 times better than that of electret condenser microphones, so MEMS microphones are particularly suitable for cost-effective microphone array applications, where a better-matched microphone will improve sound wave formation and reduce noise. Laser microphones are used in eavesdropping.

wireless microphone

The wireless microphone is composed of several pocket transmitters (which can be put in a pocket, the output power is about 0, 01W) and a centralized receiver. Each pocket transmitter has a different working frequency. The centralized receiver It can receive voice signals of different working frequencies from various pocket transmitters at the same time. It is suitable for occasions such as stage podium.