Headphones, Earphones; Headphones; The Head - sets; Earpieces) is a pair of conversion units that receive a signal from a media player or receiver and convert it into audible sound waves using a loudspeaker close to the ear. The headset is usually detachable from the media player, connected with a plug. Fortunately, you can listen to the sound by yourself without affecting others. Can also separate the surrounding environment sound, in the recording room, DJ, travel, sports, etc. in the noisy environment used very helpful. The headset was originally used for phones and radios, but with the popularity of portable electronic devices, the headset is used for mobile phones, walkman, radio, portable video games and digital audio players.
From the perspective of the development of the whole audio industry, wireless headset is still a new thing, which has not been developed for a long time. At present, it is still in the rising stage, with the continuous improvement of user demand and the improvement of user expectations for wireless headset. This is a new test for the industry. Current users concerned about several points including quality, range and wireless transmission capacity, from the data point of view, wireless transmission ability is basically can reach most of the needs of users, and the sound quality and range also has the very big rise space, if a start from these two points was improved, believe in the future will be very easy to attract users attention.
Classification article The headset is classified according to the type of its drive (transducer) and the way it is worn.
Moving coil The moving-coil headset is a common earphone. Its driving unit is basically a small moving-coil speaker, which is driven by the sound coil in the permanent magnetic field and vibrates with the diaphragm connected to it. The moving coil headset is more efficient and can be driven by the output of the headset on the stereo. Generally speaking, the larger the diameter of the drive unit, the better the performance of the headset. Currently, the maximum diameter of the drive unit is 70mm in the consumer class headset.
Moving iron A headset that vibrates and makes a sound by passing a well-structured connecting rod to the center of a miniature diaphragm. Since the unit size is much smaller, it can easily fit into the ear canal. This way you can lower the area of the ear and you can put it in the deep part of the ear canal. The geometric structure of the ear canal is much simpler than that of the auricle, which is similar to circular shape. Therefore, a soft silicone sleeve has achieved good sound insulation and sound leakage effect compared with the traditional earplug.
Coil iron mixing The iron earphone is a kind of earphone driven by the combination of moving ring and moving iron. It has the structure of single moving ring + single moving iron, single moving ring + double moving iron. The low frequency and medium frequency are naturally presented by the moving coil unit, giving play to the advantages of the low frequency of moving coil diving deep and clear intermediate frequency and natural transition. The advantages and functions of the moving-iron unit mainly undertake and complement the high-frequency attenuation section of the moving-iron unit. Starting from the frequency dividing point of 6kHz, the moving-iron unit is responsible for the high frequency and extends the high frequency range to 30kHz.
Constant magnetic type The driver of the iso-magnetic headset is similar to a miniaturized flat speaker, which embeds the flat voice coil into a thin diaphragm, like a printed circuit board, to evenly distribute the driving force. Magnets are concentrated on one or both sides of the diaphragm (push-pull type), which vibrates in the magnetic field it forms. The equal magnet headphone diaphragm is not as light as the static headphone diaphragm, but has the same large vibration area and similar sound quality.
Electrostatic Electrostatic earphones have light and thin diaphragm and are polarized by high dc voltage. The electric energy required for polarization is converted from alternating current, and there are also battery-powered ones. The diaphragm is suspended in the static field formed by two fixed metal plates (stator). The static headset must use an amplifier to convert the audio signal into a voltage signal of hundreds of volts and drive.
Electret Static headset is also called static headset. Its diaphragm itself is polarized or electrostatic field polarization emitted by the polarizing material outside the diaphragm. No special equipment is required to provide polarization voltage. The electret headset has most of the characteristics of static headset, but the electret headset gradually becomes depolarized and needs to be replaced. Its life span is about 5-10 years.
Wireless cordless They consist of two parts, a transmitter and a headset (usually a moving coil) with reception and amplification. The transmitter is connected to the signal source and can also be plugged into the front stage or headphone amplifier to improve sound quality and adjust timbre.
Wireless headsets generally refer to the headphone system transmitting signals with infrared. Cordless headsets refer to the headphone system using radio wave to transmit signals. The working frequency of the infrared headset ranges from several KHz to several MHz, and the effective distance is about 10 meters. The headset should be within the visual range. The operating frequency of radio earphones is vhf130mhz-200mhz and uhf450mhz-900mhz. Most of the cordless earphones work in UHF and can transmit up to 100 meters, and can bypass obstacles. Two or more pairs of wireless/cordless headphones may interfere with each other, so choose a variety that has multiple working frequencies when choosing them. For cordless headphones, working at UHF is less likely to be disturbed than at VHF. Both of these earphones have background noise, and the better models use noise reduction techniques. Also note that wireless/cordless headphone batteries should last no less than 8 hours.
Today's better wireless headphones use bluetooth 3.0 with aptX technology to deliver cd-quality audio over bluetooth.