The Knowledge of Microphone Category

- Sep 10, 2018-

1. Carbon microphone

Carbon microphones have a narrow frequency response range, low impedance, and are easily distorted. Currently, some phones still use such microphones.

2. Crystal and ceramic microphone (piezoelectric microphone)

Good frequency response (80Hz ~ 7kHz), high impedance, high output level, and low price.

3. Condenser microphone

The condenser microphone consists of a pole, a preamplifier and a power supply. The pole is made up of a diaphragm and a plate. The diaphragm is an electrode of the capacitor, making it the simplest capacitor. When the sound wave in the sound field vibrates the diaphragm, the distance between the diaphragm and the fixed rear plate changes, so that the capacitance also changes. This change in capacitance generates an AC voltage that varies with the sound pressure through the load resistor, through the microphone. A built-in preamplifier amplifies the output signal voltage. Advantages of the condenser microphone: good frequency characteristics, flat frequency characteristic curve; large output signal level and small distortion; no directionality, high sensitivity, and good transient response performance. The disadvantage is that the operating characteristics are not stable enough, and the sensitivity of the low frequency band decreases as the usage time increases. Since the polarization voltage and the preamplifier in the condenser microphone need to be powered by the DC power supply during operation, it is inconvenient to use. Now the +12V or +48V phantom power that is basically configured on the mixer is to supply the condenser microphone. When used, some condenser microphones can be used in a microphone, but they are bulky and heavy, which is inconvenient to use.

4. The moving coil microphone is a microphone that is widely used in the work. When the microphone picks up the sound, the thin diaphragm moves, and the coil vibrates by the diaphragm. The coil in the magnetic field converts it into an electronic signal and sends it to the mixer processing. The advantages are: good frequency characteristics, flat frequency characteristic curve in the frequency range of 50 Hz to 15000 Hz; good directivity and low noise; no need for DC power supply, easy to use, and reasonable price.

5. Wireless microphone

The wireless microphone transmits a sound signal using a wireless channel, and the system is divided into a transmitting portion and a receiving portion. The transmitting part is usually a hand-held microphone with a transmitter and a built-in battery; a lavalier microphone, a headset microphone or a microphone for a musical instrument must be connected to a portable transmitter with a built-in battery that can be clamped to the belt. The receiving part has a receiving host with the same frequency as the transmitting system, and has an antenna, a preamplifier and a signal line connected to the mixing console. The wireless microphone is widely used, and the user is not bound by the microphone line, and does not affect the visual effect of the viewer. .

There are three types of microphones: condenser microphones, dynamic microphones, and aluminum ribbon microphones (rarely).

Applications include: recording microphone, instrument microphone, interview microphone, conference microphone, voice microphone, test microphone, smartphone microphone, KTV/performance microphone.

Signal transmission: wireless, wired.

Directivity features: omnidirectional, cardioid, supercardioid, shotgun type, 8-shaped, stereo.



MAONO is an innovative designer and manufacturer of Lavalier, Podcasting, Wireless, Shotgun, Recording microphones and accessories for Smartphone, Camera and PC, etc.