Due to the advancement of today's radio communication technology, the quality and function of wireless microphone products have been relatively improved, reaching mature and practical fields, providing you with new technical requirements for the design of this product, allowing consumers to purchase this. Before the product, you can judge how to purchase a good value-for-money product, and also provide manufacturers with reference to explore how to produce and sell advanced products that consumers are satisfied with.
one. Before you understand the type of wireless microphone, you should first have a basic concept of the product category to choose the model that suits your needs. The categories of wireless microphones can be distinguished into many different types according to different definitions.
1. According to the frequency of transmission use:
a. FM wireless microphone: Commonly known as FM refers to the FM 88-108MHz international FM broadcasting band. The early consumer wireless microphone was received by FM radio. The system was simple and low-cost. However, due to the use effect, it failed to meet the requirements of professional quality. At present, it can only be a toy for children or students.
b. VHF wireless microphone: It is divided into two types: low frequency and high frequency. The former uses VHF 50MHz frequency band. Because of the low frequency, the antenna length is too long, and it is most susceptible to interference from various electrical clutter. Therefore, this type of Products, which have been replaced by high frequency bands, have gradually disappeared from the market. The latter uses the frequency band of VHF200MHz. Due to the high frequency, the antenna is short, and even can be designed as a hidden antenna. It is convenient, safe and beautiful. The clutter interference of the electrical device is greatly reduced. The circuit design is very mature and the parts are popular. It is cheap, so it has become a popular model on the market today.
2. According to the way of receiving:
a. Automatic diversity receiving wireless system (True diversity receiving wireless system): due to the "dead-point" physical phenomenon in the radio wave, the receiver's sound output, resulting in intermittent or unstable shortcomings, in order to To solve this kind of defect, the professional model must be improved by the "automatic switching" method of dual antenna and dual tuner.
b. Non-diversity receiving wireless system: Due to the complicated and precise circuit design of the above models, the assembly is difficult and the cost is high. Generally, the low-cost models do not adopt the design of automatic signal selection. Therefore, it is also impossible to eliminate the disadvantage that the wireless microphone generates a sound interruption during use. This type of machine certainly cannot meet the basic requirements for professional use.
Differentiated by the way of oscillation:
a. Quartz lock (Qualtz locked) model: The quartz oscillator generates a fixed frequency of transmission and reception, and the circuit is simple and low-cost. It is the standard circuit design of today's wireless microphones. This type of microphone and receiver are only fixed for a single frequency pairing and cannot be changed or adjusted.
b. Phase Locked Frequency Synthesis (PLL Synthesized): In order to avoid the wireless microphone being unable to use other signals during use, or to use multiple microphones at the same time, it is necessary to change the channel conveniently and quickly at any time. The circuit design of the PLL is used to achieve the requirements of this function.
4. According to the number of receiver channels:
a. Single-channel model: Only one channel of non-automatic signal selection or automatic channel selection receiver is installed in the chassis of a receiver. The former has almost no market in Taiwan, but the export market is cheaper because it is cheaper. Large color goods). The latter is simple and stable in characteristics, and is suitable for multi-channel simultaneous use in professional situations to avoid signal interference.
b. Dual-channel model: Two channels of non-automatic signal selection or automatic signal selection receiver are installed in the chassis of a receiver to make full use of the space of the chassis and reduce costs. The former is the so-called "Asian fighter type" model, because of its simple design, it has become the main model for mass production of low-priced manufacturers. In the latter, because of the complexity of the mechanism and the circuit, the internal interference processing and the antenna hybrid matching are not easy, and only a few models are available in the manufacturers of professional models.
c. Multi-channel models: In a receiver's chassis, more than four channels of receivers are installed, most of which adopt the modular design of the modular receiving module. It is mainly suitable for the use of rack-mounted professional models.
two. The choice between price and quality Recently, some smaller manufacturers, in order to fight for orders, are not committed to the development of more advanced models, but are committed to producing cheaper models at a lower price to attract consumers. As the saying goes: "A penny, a piece of goods", consumers often buy a poor quality product because of the cheap price. Some consumers are misled by excessively superstitious people or by advertisements that are not true. How to choose a value-for-money model, first of all to meet the quality positioning required by yourself, and to further understand how to evaluate the quality of wireless microphones, in order to choose a truly satisfactory product.
three. The technical background of the manufacturer determines the quality of the product. The wireless microphone product is a product designed by combining audio and wireless communication technology. It is completely different from the technology and equipment for manufacturing wired microphone. Therefore, the wired microphone manufacturer that also manufactures the "microphone" is not necessarily Manufacturers who can manufacture wireless microphones and manufacture wireless communication products may not be able to make good wireless microphones. Only manufacturers with long-term professional audio technology and wireless high-frequency technology can make excellent wireless microphones. Because wireless microphone products are quite different from other wired products, the effect is very closely affected by environmental conditions. Therefore, a good quality wireless microphone can not be designed in the laboratory in a short period of time. It also needs long-term cooperation. After the user actually uses the various environments, he will give back to the design engineer, and then continue to develop and improve, in order to create a truly beautiful product. Therefore, if you choose a good wireless microphone product, you must choose a professional technical background and long-term manufacturing experience.
four. An excellent wireless microphone should have the following excellent features:
1. Appearance has an ergonomic and aesthetic basis: the body of the hand-held wireless microphone must have a size suitable for hand grasping and a beautiful shape. Generally, the traditional body is bamboo or trapezoidal, which is not aesthetically pleasing. It is also not suitable for hand grasping, especially for users who are prone to sweating, and it is less likely to be gripped and slipped. The most suitable shape for the hand grip is a double inner curve shape with a smaller intermediate diameter than the two ends. Just like the Chinese Guanyin bottle or the woman's waist, it is not only beautiful but also easy to grip.
2. The hand-held microphone should adopt the advanced hidden antenna design: the big difference between man and monkey is that there is no tail. The early wireless microphones have an external antenna at the end, and the advanced wireless microphone overcomes the technical difficulties, no longer uses the outdated external design, and uses the most beautiful hidden antenna design to make the wireless microphone easy to use. Safe, beautiful and without breaking the advantages of failure.
3. To assemble a good sound head:
The quality of the sound head determines the quality of the wireless microphone. The sound head has two types of moving coil type and capacitive type. The moving coil type is a coil supported on the diaphragm, and converts sound energy into an electric energy signal between high-density magnetic fields. This voice head has a certain limit on the voice coil characteristics. But basically the structure is simple and the price is cheap, which is the most popular model on the market. The condenser microphone is a combination of electronic and structural high-level microphones. Its pronunciation is to use the ultra-thin gold-plated diaphragm to directly convert the sound into electric energy signals by using the change of the inter-electrode capacitance. The main feature of high-quality condenser microphones is the ability to display extremely clear original sound quality. The high and low frequency response is very wide and flat, the sensitivity is very high, the directivity and dynamic range are large, the distortion rate is small, the volume is light and fall, and the touch noise is low. Widely used in professional equipment such as recording studios, professional stage, test equipment. The disadvantage is that Phantom Power is required, but because the wireless microphone itself has a power supply, the condenser head is a better match for the wireless microphone, so that all the advantages are on the wireless microphone.
4. The microphone should have the superior features of low touch noise:
The hand-held wireless microphone has a frictional touch noise between the palm and the palm of the hand, which has an impact on the normal sound quality. In particular, the wireless microphone itself has a sensitive preamplifier, which makes the touch noise more serious and becomes a technical bottleneck. . The general wireless microphone has no professional design experience, and in order to reduce the manufacturing cost, the use of simple circuit, the use of cheap sound head, poor suspension design and inexpensive body surface treatment, so the sound quality is not clear can not overcome the significant microphone The noise is degraded by touching the noise, so if you choose a wireless microphone with good quality, you must pay special attention to the characteristics of extremely clear sound quality and ultra-low touch noise.
5. Has the function of eliminating sound interruption or instability:
The signal transmitted by the wireless microphone is attracted and reflected by the surrounding environment, causing the signal received by the receiving antenna to have a dead angle, which causes the output sound to be interrupted or unstable. Especially in professional situations, this phenomenon is not allowed. occur. In order to solve this shortcoming, only the use of a more advanced automatic signal receiving system can achieve the best results. The popular dual-channel receivers that are popular in the market do not have such an automatic selective reception function, and cannot avoid the above disadvantages, so they can only be used in short-range family karaoke occasions. In a professional place or a user who values ​​sound quality, the model of the automatic signal receiving system must be selected to meet the sound quality requirements and obtain a good performance.
6. It has the function of preventing the noise from being disturbed during standby:
Generally, most receivers have a mute control function (Squelch Control). When the power is turned on without a microphone signal input or the signal strength is lower than a certain signal-to-noise ratio, the mute control circuit turns off the output circuit, and the main receiver is completely muted to prevent noise. Output. When the microphone signal is turned on, the receiver immediately activates the mute circuit, allowing 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 beyond the mute control strength, the receiver mute circuit will also be activated by these impact noise and interference noise. In order to solve this deficiency, a so-called "audio lock mute circuit" is installed in a high-quality model to suppress it. The principle is to add a fixed super-audio modulation signal to the microphone's transmission signal: a discriminator is also installed inside the receiver, so that the receiver must receive the microphone signal containing the fixed super-tone modulation signal. The output circuit can be activated to prevent interference from other signals or noise. In order to protect your valuable audio system from being damaged by loud noise, you must select a model with tone lock mute function.
7. With multi-channel use mutual interference function:
The technical bottleneck of the use of wireless microphones is the problem of signal interference. In particular, the more the frequency of use, the more serious the problem of interference. Therefore, in the case of using multiple wireless microphones at the same place, it is necessary to avoid interference, in addition to careful selection. In addition to the frequency of physical interference and the avoidance of adjacent external signal interference, the receiver should have excellent selectivity, and the radiated harmonics of the transmitted and received signals should be filtered out to be very clean, so as to avoid mutual interference of signals. In the general VHF band, it is quite good to use 12 frequencies at the same time.
8. To solve the multi-channel simultaneous use and avoid interference, multi-channel series models with digital lock can change the frequency: the traditional wireless microphone system adopts quartz lock fixed frequency design, this type of machine needs multi-channel use occasions. In the case of strong signal interference, it is impossible to replace the frequency that you wish to use, but it must be replaced. In order to solve this deficiency, advanced models use phase locked frequency synthesis (PLL Synthesized), and pre-stored dozens of frequencies in the transmitter and receiver can be arbitrarily changed by the user, although this advanced design is more expensive. However, it provides a very convenient function for distribution and users to completely solve the above-mentioned shortcomings.
9. To avoid the frequency "catch" or signal interference, the digital locking UHF channel system should be selected: due to the current use of wireless microphones in the VHF200MHz frequency band, the interference of signals and the interference of various electrical noises are becoming more and more serious. Therefore, the frequency of professional-grade wireless microphones has been gradually increased to the UHF frequency band of 800MHz, and the PLL phase locking circuit is adopted. The preset multi-channel can be switched at will, avoiding the interference of other signals and general electrical noise, and obtaining better use effect. . Due to the complicated circuit design of the UHF band and the high-frequency components used, the current price is still high, and there are fewer manufacturers of mass production. However, the UHF model is a better choice for professional quality and gradually becomes the future. The trend is popular.
10. Products with high quality certification and qualified by telecommunications regulations: Excellent wireless microphone products must be manufactured by high quality certified factories and must be certified by national radio regulations before they can be legally sold and used. Consumers should choose to use certified products for quality assurance.
Fives. Collection and evaluation of data:
The most basic source of information for purchasing products is the catalogue and magazine advertisements provided by the manufacturer. However, manufacturers with small scale equipment are not able to provide correct values, so that consumers cannot understand the analysis and comparison from the catalogue. Some manufacturers use catalogues and advertisements to make exaggerated facts and mislead consumers' psychology. But the quality is not made with the mouth, but it is made. The smart consumers are in the developed information today. As long as the actual products of the manufacturers are used for detailed analysis, actual testing and relative comparison, the correct quality evaluation can be obtained.
Finally: choose a set of wireless microphone products that can suit your needs and be satisfied after use. In addition to understanding the above reference principles, the real action is to collect more relevant information and actually listen to the comparison before you can buy things. Great value for money. However, the products of science and technology are changing with each passing day, and the functions are constantly updated. If you want to buy a new product, you must purchase the more advanced models. Even if the price is more expensive, you don’t have to hesitate. You have priority!
one. Before you understand the type of wireless microphone, you should first have a basic concept of the product category to choose the model that suits your needs. The categories of wireless microphones can be distinguished into many different types according to different definitions.
1. According to the frequency of transmission use:
a. FM wireless microphone: Commonly known as FM refers to the FM 88-108MHz international FM broadcasting band. The early consumer wireless microphone was received by FM radio. The system was simple and low-cost. However, due to the use effect, it failed to meet the requirements of professional quality. At present, it can only be a toy for children or students.
b. VHF wireless microphone: It is divided into two types: low frequency and high frequency. The former uses VHF 50MHz frequency band. Because of the low frequency, the antenna length is too long, and it is most susceptible to interference from various electrical clutter. Therefore, this type of Products, which have been replaced by high frequency bands, have gradually disappeared from the market. The latter uses the frequency band of VHF200MHz. Due to the high frequency, the antenna is short, and even can be designed as a hidden antenna. It is convenient, safe and beautiful. The clutter interference of the electrical device is greatly reduced. The circuit design is very mature and the parts are popular. It is cheap, so it has become a popular model on the market today.
2. According to the way of receiving:
a. Automatic diversity receiving wireless system (True diversity receiving wireless system): due to the "dead-point" physical phenomenon in the radio wave, the receiver's sound output, resulting in intermittent or unstable shortcomings, in order to To solve this kind of defect, the professional model must be improved by the "automatic switching" method of dual antenna and dual tuner.
b. Non-diversity receiving wireless system: Due to the complicated and precise circuit design of the above models, the assembly is difficult and the cost is high. Generally, the low-cost models do not adopt the design of automatic signal selection. Therefore, it is also impossible to eliminate the disadvantage that the wireless microphone generates a sound interruption during use. This type of machine certainly cannot meet the basic requirements for professional use.
Differentiated by the way of oscillation:
a. Quartz lock (Qualtz locked) model: The quartz oscillator generates a fixed frequency of transmission and reception, and the circuit is simple and low-cost. It is the standard circuit design of today's wireless microphones. This type of microphone and receiver are only fixed for a single frequency pairing and cannot be changed or adjusted.
b. Phase Locked Frequency Synthesis (PLL Synthesized): In order to avoid the wireless microphone being unable to use other signals during use, or to use multiple microphones at the same time, it is necessary to change the channel conveniently and quickly at any time. The circuit design of the PLL is used to achieve the requirements of this function.
4. According to the number of receiver channels:
a. Single-channel model: Only one channel of non-automatic signal selection or automatic channel selection receiver is installed in the chassis of a receiver. The former has almost no market in Taiwan, but the export market is cheaper because it is cheaper. Large color goods). The latter is simple and stable in characteristics, and is suitable for multi-channel simultaneous use in professional situations to avoid signal interference.
b. Dual-channel model: Two channels of non-automatic signal selection or automatic signal selection receiver are installed in the chassis of a receiver to make full use of the space of the chassis and reduce costs. The former is the so-called "Asian fighter type" model, because of its simple design, it has become the main model for mass production of low-priced manufacturers. In the latter, because of the complexity of the mechanism and the circuit, the internal interference processing and the antenna hybrid matching are not easy, and only a few models are available in the manufacturers of professional models.
c. Multi-channel models: In a receiver's chassis, more than four channels of receivers are installed, most of which adopt the modular design of the modular receiving module. It is mainly suitable for the use of rack-mounted professional models.
two. The choice between price and quality Recently, some smaller manufacturers, in order to fight for orders, are not committed to the development of more advanced models, but are committed to producing cheaper models at a lower price to attract consumers. As the saying goes: "A penny, a piece of goods", consumers often buy a poor quality product because of the cheap price. Some consumers are misled by excessively superstitious people or by advertisements that are not true. How to choose a value-for-money model, first of all to meet the quality positioning required by yourself, and to further understand how to evaluate the quality of wireless microphones, in order to choose a truly satisfactory product.
three. The technical background of the manufacturer determines the quality of the product. The wireless microphone product is a product designed by combining audio and wireless communication technology. It is completely different from the technology and equipment for manufacturing wired microphone. Therefore, the wired microphone manufacturer that also manufactures the "microphone" is not necessarily Manufacturers who can manufacture wireless microphones and manufacture wireless communication products may not be able to make good wireless microphones. Only manufacturers with long-term professional audio technology and wireless high-frequency technology can make excellent wireless microphones. Because wireless microphone products are quite different from other wired products, the effect is very closely affected by environmental conditions. Therefore, a good quality wireless microphone can not be designed in the laboratory in a short period of time. It also needs long-term cooperation. After the user actually uses the various environments, he will give back to the design engineer, and then continue to develop and improve, in order to create a truly beautiful product. Therefore, if you choose a good wireless microphone product, you must choose a professional technical background and long-term manufacturing experience.
four. An excellent wireless microphone should have the following excellent features:
1. Appearance has an ergonomic and aesthetic basis: the body of the hand-held wireless microphone must have a size suitable for hand grasping and a beautiful shape. Generally, the traditional body is bamboo or trapezoidal, which is not aesthetically pleasing. It is also not suitable for hand grasping, especially for users who are prone to sweating, and it is less likely to be gripped and slipped. The most suitable shape for the hand grip is a double inner curve shape with a smaller intermediate diameter than the two ends. Just like the Chinese Guanyin bottle or the woman's waist, it is not only beautiful but also easy to grip.
2. The hand-held microphone should adopt the advanced hidden antenna design: the big difference between man and monkey is that there is no tail. The early wireless microphones have an external antenna at the end, and the advanced wireless microphone overcomes the technical difficulties, no longer uses the outdated external design, and uses the most beautiful hidden antenna design to make the wireless microphone easy to use. Safe, beautiful and without breaking the advantages of failure.
3. To assemble a good sound head:
The quality of the sound head determines the quality of the wireless microphone. The sound head has two types of moving coil type and capacitive type. The moving coil type is a coil supported on the diaphragm, and converts sound energy into an electric energy signal between high-density magnetic fields. This voice head has a certain limit on the voice coil characteristics. But basically the structure is simple and the price is cheap, which is the most popular model on the market. The condenser microphone is a combination of electronic and structural high-level microphones. Its pronunciation is to use the ultra-thin gold-plated diaphragm to directly convert the sound into electric energy signals by using the change of the inter-electrode capacitance. The main feature of high-quality condenser microphones is the ability to display extremely clear original sound quality. The high and low frequency response is very wide and flat, the sensitivity is very high, the directivity and dynamic range are large, the distortion rate is small, the volume is light and fall, and the touch noise is low. Widely used in professional equipment such as recording studios, professional stage, test equipment. The disadvantage is that Phantom Power is required, but because the wireless microphone itself has a power supply, the condenser head is a better match for the wireless microphone, so that all the advantages are on the wireless microphone.
4. The microphone should have the superior features of low touch noise:
The hand-held wireless microphone has a frictional touch noise between the palm and the palm of the hand, which has an impact on the normal sound quality. In particular, the wireless microphone itself has a sensitive preamplifier, which makes the touch noise more serious and becomes a technical bottleneck. . The general wireless microphone has no professional design experience, and in order to reduce the manufacturing cost, the use of simple circuit, the use of cheap sound head, poor suspension design and inexpensive body surface treatment, so the sound quality is not clear can not overcome the significant microphone The noise is degraded by touching the noise, so if you choose a wireless microphone with good quality, you must pay special attention to the characteristics of extremely clear sound quality and ultra-low touch noise.
5. Has the function of eliminating sound interruption or instability:
The signal transmitted by the wireless microphone is attracted and reflected by the surrounding environment, causing the signal received by the receiving antenna to have a dead angle, which causes the output sound to be interrupted or unstable. Especially in professional situations, this phenomenon is not allowed. occur. In order to solve this shortcoming, only the use of a more advanced automatic signal receiving system can achieve the best results. The popular dual-channel receivers that are popular in the market do not have such an automatic selective reception function, and cannot avoid the above disadvantages, so they can only be used in short-range family karaoke occasions. In a professional place or a user who values ​​sound quality, the model of the automatic signal receiving system must be selected to meet the sound quality requirements and obtain a good performance.
6. It has the function of preventing the noise from being disturbed during standby:
Generally, most receivers have a mute control function (Squelch Control). When the power is turned on without a microphone signal input or the signal strength is lower than a certain signal-to-noise ratio, the mute control circuit turns off the output circuit, and the main receiver is completely muted to prevent noise. Output. When the microphone signal is turned on, the receiver immediately activates the mute circuit, allowing 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 beyond the mute control strength, the receiver mute circuit will also be activated by these impact noise and interference noise. In order to solve this deficiency, a so-called "audio lock mute circuit" is installed in a high-quality model to suppress it. The principle is to add a fixed super-audio modulation signal to the microphone's transmission signal: a discriminator is also installed inside the receiver, so that the receiver must receive the microphone signal containing the fixed super-tone modulation signal. The output circuit can be activated to prevent interference from other signals or noise. In order to protect your valuable audio system from being damaged by loud noise, you must select a model with tone lock mute function.
7. With multi-channel use mutual interference function:
The technical bottleneck of the use of wireless microphones is the problem of signal interference. In particular, the more the frequency of use, the more serious the problem of interference. Therefore, in the case of using multiple wireless microphones at the same place, it is necessary to avoid interference, in addition to careful selection. In addition to the frequency of physical interference and the avoidance of adjacent external signal interference, the receiver should have excellent selectivity, and the radiated harmonics of the transmitted and received signals should be filtered out to be very clean, so as to avoid mutual interference of signals. In the general VHF band, it is quite good to use 12 frequencies at the same time.
8. To solve the multi-channel simultaneous use and avoid interference, multi-channel series models with digital lock can change the frequency: the traditional wireless microphone system adopts quartz lock fixed frequency design, this type of machine needs multi-channel use occasions. In the case of strong signal interference, it is impossible to replace the frequency that you wish to use, but it must be replaced. In order to solve this deficiency, advanced models use phase locked frequency synthesis (PLL Synthesized), and pre-stored dozens of frequencies in the transmitter and receiver can be arbitrarily changed by the user, although this advanced design is more expensive. However, it provides a very convenient function for distribution and users to completely solve the above-mentioned shortcomings.
9. To avoid the frequency "catch" or signal interference, the digital locking UHF channel system should be selected: due to the current use of wireless microphones in the VHF200MHz frequency band, the interference of signals and the interference of various electrical noises are becoming more and more serious. Therefore, the frequency of professional-grade wireless microphones has been gradually increased to the UHF frequency band of 800MHz, and the PLL phase locking circuit is adopted. The preset multi-channel can be switched at will, avoiding the interference of other signals and general electrical noise, and obtaining better use effect. . Due to the complicated circuit design of the UHF band and the high-frequency components used, the current price is still high, and there are fewer manufacturers of mass production. However, the UHF model is a better choice for professional quality and gradually becomes the future. The trend is popular.
10. Products with high quality certification and qualified by telecommunications regulations: Excellent wireless microphone products must be manufactured by high quality certified factories and must be certified by national radio regulations before they can be legally sold and used. Consumers should choose to use certified products for quality assurance.
Fives. Collection and evaluation of data:
The most basic source of information for purchasing products is the catalogue and magazine advertisements provided by the manufacturer. However, manufacturers with small scale equipment are not able to provide correct values, so that consumers cannot understand the analysis and comparison from the catalogue. Some manufacturers use catalogues and advertisements to make exaggerated facts and mislead consumers' psychology. But the quality is not made with the mouth, but it is made. The smart consumers are in the developed information today. As long as the actual products of the manufacturers are used for detailed analysis, actual testing and relative comparison, the correct quality evaluation can be obtained.
Finally: choose a set of wireless microphone products that can suit your needs and be satisfied after use. In addition to understanding the above reference principles, the real action is to collect more relevant information and actually listen to the comparison before you can buy things. Great value for money. However, the products of science and technology are changing with each passing day, and the functions are constantly updated. If you want to buy a new product, you must purchase the more advanced models. Even if the price is more expensive, you don’t have to hesitate. You have priority!
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