How to choose a wireless microphone

1. The appearance is designed with ergonomic and aesthetic basis

The tube body of the hand-held wireless microphone must have a size suitable for the hand and a beautiful shape. Generally, the traditional tube body is in the shape of a bamboo tube or a trapezoid. The user is less likely to hold it tightly and slip it off.

2. The hand-held microphone should adopt advanced hidden antenna design

The end of the early wireless microphones was connected with an antenna, but the advanced wireless microphones overcome the technical difficulties and no longer use the outdated external design, but adopt the most perfect hidden antenna design, so that the wireless microphone has convenient use, Safe, beautiful and will not break the advantages of failure.

3. Assemble an excellent capsule

The quality of the capsule determines the first hurdle of the sound quality of the wireless microphone. There are two types of sound head: moving coil type and capacitive type. The moving coil type uses a coil loaded on the vibrating membrane to convert sound energy into electrical energy signals between high-density magnetic fields. There are certain limits on the voice coil characteristics of this capsule. But the basic structure is simple, the price is cheap, it is the most popular model on the market. Condenser microphone is a microphone with high technical level in combination with electronics and structure. Its pronunciation is to use the change of inter-pole capacitance to directly convert sound into electrical energy signal with ultra-thin gold-plated diaphragm. The most important feature of advanced condenser microphone is that it can show very clear original sound quality, high and low frequency response is very broad and flat, very high sensitivity, large directivity and dynamic range, low distortion rate, light weight and resistance to falling, low touch noise, widely used In recording studios, professional stages, test instruments and other professional equipment. The only disadvantage is that it needs to provide phantom power, but because the wireless microphone itself has a power supply, the condenser capsule is the best match for the wireless microphone, so that all the advantages can be exerted on the wireless microphone.

4. The microphone should have the advantage of low touch noise

The hand-held wireless microphone has an impact on the normal sound quality due to the touch noise generated by friction between the hand and the palm of the hand. The general wireless microphone has no professional design experience, and in order to reduce the manufacturing cost, it uses a simple circuit, and chooses cheap capsules, Poor shock-absorbing suspension design and cheap surface treatment of the tube body, so the sound quality is not clear and cannot overcome the significant touch noise of the microphone and the original sound is deteriorated. Low touch noise characteristics.

5. Has the function of eliminating sound interruption or instability

The signal emitted by the wireless microphone is attracted and reflected by the surrounding environment, resulting in the phenomenon of dead angle of the signal received by the receiving antenna, resulting in interruption or instability of the output sound, especially in professional occasions. This phenomenon is not allowed occur. In order to solve this shortcoming, the most perfect effect can be obtained only by adopting the most advanced automatic selection receiving system.

6. It has the function of preventing noise and loud noise from being disturbed during standby

When the microphone signal is turned on, the receiver immediately closes the mute circuit, opens the output circuit, and allows the audio circuit to output the sound of the microphone. However, when the microphone power is turned on and off, or when the microphone signal is turned off, occasionally encountering signal interference exceeding the mute control strength, the receiver mute circuit will also be activated by these impact noises and interference noises to output loud noises. In order to solve this deficiency, the so-called "audio lock mute circuit" is installed in advanced models to suppress it. The principle is to add a fixed super-audio modulation signal to the transmission signal of the microphone: at the same time, a discriminator is also installed inside the receiver, so that the receiver must receive the microphone signal containing this fixed super-audio modulation signal. When the output circuit is activated, the function of preventing other signals or noise interference can be achieved. In order to protect your valuable audio system from being damaged by loud noises, you must choose a model with a tone code lock mute function.

7. To solve the simultaneous use of multiple channels and avoid interference, the multi-channel series models that can change the frequency by digital locking should be selected.

The biggest technical bottleneck in the use of wireless microphones is the problem of signal interference. In particular, the more frequencies used, the more serious the problem of interference. Therefore, when using multiple wireless microphones at the same location at the same time, to avoid interference, in addition to careful selection of physical In addition to the frequency that does not interfere with each other and avoiding the interference of adjacent external signals, the receiver must have excellent selectivity, and the radiated harmonics of transmission and reception must be filtered very cleanly to avoid mutual interference of signals. The traditional wireless microphone system adopts the design of quartz locking fixed frequency. This type of model cannot arbitrarily change the desired frequency in the case of multi-channel use or in the case of strong signal interference, but must be replaced with the whole set. . In order to solve this deficiency, advanced models adopt the method of phase-locked frequency synthesis (PLL Synthesized), which pre-stores dozens of frequencies in the transmitter and receiver for users to change arbitrarily, although the cost of this advanced design is relatively high. , but it provides very convenient functions for distribution and users, and completely solves the above deficiencies.

8. To avoid frequency "traffic jam" or signal interference, products with digital locking UHF channel system should be selected

Due to the excessive use of wireless microphones in the VHF200MHz frequency band, the problem of signal interference and various electrical noise interference is becoming more and more serious. Therefore, the frequency used by professional wireless microphones is gradually increased to the 800MHz UHF frequency band, and a PLL phase locking circuit is used. , the preset multi-channel design can be switched arbitrarily, to avoid the interference of other signals and general electrical noise, to obtain the best use effect.

9. Products that have international quality certification and have passed the inspection of telecommunications regulations

Excellent wireless microphone products must be manufactured by factories that have passed international quality certification, and must also pass the certification of radio wave regulations in various countries before they can be legally sold and used. Consumers should choose certified products to use, and the quality is guaranteed.