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How to choose a wireless microphone and what types of wireless microphones are divided into

2021-02-27 69
Wireless microphones have evolved from a simple wireless FM transmitter and wireless FM receiver to the current dedicated

PLL (Frequency Phase Locked Loop) technology has gone through about three stages. There are VHF, UHF and digital wireless microphones (wireless microphones) in wireless microphones currently in use.

How to choose a wireless microphone and what types of wireless microphones are divided into

According to the principle, it is divided into: electric type (moving coil type, aluminum belt type); capacitive type (DC polarization type); piezoelectric type (crystal type, ceramic type); electromagnetic type, carbon particle type, semiconductor type

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

According to the electric signal transmission method, it is divided into: wired and wireless.

According to the purpose, it is divided into: measuring microphone, leaping microphone, recording microphone.

According to the directivity, it is divided into: heart-shaped, sharp-hearted, super-cardioid, two-way (8-shaped), non-directional (omnidirectional)

How to choose a wireless microphone and what types of wireless microphones are divided into
How to choose a wireless microphone and what types of wireless microphones are divided into
Currently commonly used classifications are: moving coil type and capacitive type. Dynamic microphone: mainly composed of coil, magnet, and shell. When the microphone receives sound waves, it acts on the diaphragm,

Cause the diaphragm to vibrate and drive the voice coil to vibrate accordingly. The voice coil is magnetically

Movement in the steel generates electromotive force, and the sound signal is converted into an electric signal. Dynamic microphone use

It is relatively simple, does not require polarization voltage, is firm and reliable, has stable performance, and is relatively inexpensive. In karaoke

It is widely used, but its transient response and high-frequency characteristics are not as good as condenser microphones.

How to choose a wireless microphone and what types of wireless microphones are divided into
Condenser microphone: It is mainly composed of a diaphragm, a rear panel, a polarized power supply, and a preamplifier. The polar head of a capacitor microphone is actually a flat plate capacitor, a fixed electrode, a movable electric plate, and a movable electric plate are very thin diaphragms. The vibration caused by sound waves acting on the diaphragm, which changes the capacitance between the two plates, causes the change of the amount of charge on the plates, and the amount of charge changes with time to form a high variable current, which flows through the resistor R to produce a voltage drop at both ends ,

After passing the amplifier, the high-variable signal is output. Since the output impedance is very high, it cannot be output directly, so a preamplifier is installed in the microphone case to perform impedance conversion. Change high impedance to low impedance output.


How to choose a wireless microphone and what types of wireless microphones are divided into


How to choose a wireless microphone and what types of wireless microphones are divided into
Don’t hold your hand on the head of the microphone

This is because the receiving part of all microphones has a certain degree of directivity. If the upper part of the mesh cover is held by the hand, the frequency response will be severely damaged, and the focus and feedback will be generated due to the focusing effect of the palm.

How to choose a wireless microphone and what types of wireless microphones are divided into
Don’t hold the microphone’s antenna. The transmitting part of the microphone is generally a handheld microphone. Its transmitting circuit and antenna are located at the lower part of the microphone (the end far away from the microphone). When we hold it by hand, the transmitting power will be greatly attenuated and the receiving effect will be affected.

Do not hold two wireless microphones together for use. Because handheld wireless microphones are two transmitters, they will produce harmonic pools. When two wireless microphones are close together, their mutual harmonics will modulate each other. Produce interference, which seriously affects the transmission and reception and sound quality.

Do not use the microphone too close to the mouth. It is generally better to keep the distance between the microphone and the mouth at 5-10 cm. Too close will produce a close-speaking effect, and the sound is very light if it is too far away, which will destroy the sound quality.

Avoid the microphone directly facing the speaker, such as the microphone directly facing the speaker, as far as the sound system is concerned, a closed loop is formed, which will produce positive feedback oscillation (howling), which must be avoided.

How to choose a wireless microphone and what types of wireless microphones are divided into

Precautions
Choose a set of wireless microphone products that can suit your needs and feel satisfied after using it. In addition to understanding the above reference principles, the real action is to collect more relevant information by yourself and actually listen to the comparison before you can buy a super The value-for-money product.
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