Because it is too close to yourself, it is neglected, and headphones are such a product. In the real life, you can see the figure of headphones everywhere, at home, in the outdoors, all kinds of English listening exams, etc., and indispensable headphones. Headphones have evolved from invention to modern times, as people's technology advances.
With the development of time, the earphone products have gradually matured from the earliest two small speakers hanging in the ear. Whether it is the type of headphones or the way they are worn, or even the core's pronunciation unit, there have been many changes.
wearing method
The earliest earphones were two sounding units hung on the side of the ear. Many types of headphones have been developed, including earphones, earplugs, ear hooks and newly developed bone conduction earphones. Headphones are the earliest types of headphones.
Earplugs are a revolutionary breakthrough in the development of headphones, and the smaller size makes it very convenient to use outside. Due to the development of the city, the ambient noise is getting bigger and bigger, and the in-ear earphone is a breakthrough of the earplug product, and it is more suitable for outdoor use.
Ear hooks can be regarded as an intermediate product of earphones and earplugs. The characteristics of earloops are the advantages and disadvantages of earphones and earphones. They are a kind of products with less obvious characteristics, but the earloops are very beautiful when worn. Bone conduction headphones are a relatively new technology that uses the principle of vibration to transmit sound directly through the skull to the listening center. However, this product has not yet become popular, and it can bring a revolutionary breakthrough to headphones. It is still unclear today.
Rich in type
Due to the different uses of headphones, the types of headphones have gradually enriched. The types of earphones can be broadly divided into open, closed and semi-open.
Open-type headphones generally have a natural sense of hearing and are comfortable to wear. The comfort here is that there is no sultry feeling, which is common in HIFI headphones for home use. The sound can be leaked out, and the same can be heard from the outside world. The earphones have less pressure on the ears.
Semi-open headphones are not strictly regulated, and the sound can only be made in or out, and the design is adjusted according to the needs of the use.
The earmuffs of the enclosed earphones adopt a fully enclosed structure, which can prevent the outside sound from entering, has a greater pressure on the ears, and the sound positioning is accurate and clear, and the structure is widely used in the professional monitoring field. There are also some closed headphones that have the sound field of open headphones, which keeps the high quality sound while isolating the noise.
Headphones have evolved to the present day, and the most important pronunciation unit is the dynamic circle pronunciation unit. Dynamic headphones technology has matured after so many years of development, but it has also encountered bottlenecks in sound improvement. In addition to electrostatic headphones, the dynamic ring pronunciation unit also has a lot of derivative technology, and the most widely used one is the moving iron pronunciation unit.
The moving iron pronunciation unit uses an electromagnet to generate an alternating magnetic field. The vibrating part is an iron piece suspended in front of the electromagnet. When the signal passes through the electromagnet, the electromagnet magnetic field changes, and the iron piece vibrates and sounds. The advantage is long service life and high efficiency. The disadvantage is that the distortion is large and the frequency response is narrow. Often used in early telephone handsets. This technology is mainly used on earplugs today, because the moving iron sounding unit is much smaller than the moving coil sounding unit. Many high-end earplugs integrate two or even three moving iron sounding units, and the sound performance of each frequency band is excellent. .
The diaphragm is suspended in an electrostatic field formed by two fixed metal plates (stator). The electrostatic headphones must use a special amplifier to convert the audio signal into a voltage signal of hundreds of volts.
Although the electrostatic headphones have various advantages, the technology of the pronunciation unit is only in the hands of a few manufacturers. The basic price of the electrostatic headphones on the market is more than 10,000 yuan. It is worth mentioning that China's earphone enthusiasts, WINNY developed the first set of static headphones in China, becoming a milestone in the history of Chinese headphones development.
The development of headphones has evolved toward wireless and noise reduction. Wireless headphones are more free to use. With the development of technology, wireless transmission technology has matured to ensure the sound quality of wireless headphones. Another reason is the popularity of mobile music and the birth of Bluetooth wireless transmission technology. Bluetooth wireless headphones are developing rapidly.
As the noise pollution in the city becomes more and more serious, using ordinary earphone earplugs outdoors can only increase the volume to cover the noise, so that not only can not enjoy the beautiful music, but also has a great impact on your hearing. The emergence of noise canceling headphones has solved this problem very well.
The active noise canceling earphone has a noise reducer. The noise reducer uses a microphone to collect the external sound and emits the opposite sound wave to counteract the noise. Today, people are more and more concerned about their health, noise-reducing headphones can better enjoy music outside, but also ensure the health of the ear, is the future development direction of headphones. Active noise-cancelling headphones have been designed for travellers with wireless, noise-reduction and high-quality features. Bluetooth 3.0 with aptX provides up to 10 hours of music listening.
Science and technology can only rely on radio signals to easily transmit information, so mobile phone radiation is inevitable. The mobile phone is a very strong source of radiation, especially the power of the mobile phone when it is connected. The long-term frequent call can even kill people. Since the intensity of the radiation is inversely proportional to the square of the distance, the retention distance is most effective in applications that prevent cell phone radiation. The basic principle of the radiation-proof earphone is also the distance between the human brain and the mobile phone. If this principle is violated, it cannot really play the role of radiation protection.
There are two types of earphones on the market today that are said to be radiation-proof, including Bluetooth earphones and air-conducting earphones. Among them, air-conducting earphones are more effective. The air-conducting earphone developed by Chinese scientific and technical personnel has obtained the invention patent of the International Organization of Intellectual Property Organization (PCT) (patent international application number: PCT/CN2009/000660, international publication number: WO 2010/043097A1). This is the first time that the International Bureau of the World Intellectual Property Organization has granted invention patents to mobile phone radiation protection earphone products, proving the outstanding advantages of air conduction earphones in mobile phone radiation protection.