What are the Different Types of Headphones?
The headphones is classified according to the type of its driver (transducer) and how it is worn.
Moving Coil Headphones
The dynamic earphone is the most common and common earphone. Its driving unit is basically a small dynamic ring speaker, which is driven by a voice coil in a permanent magnetic field to vibrate the diaphragm connected to it. The dynamic earphones are relatively efficient, and most of them can be driven by the headphone output of the audio, and are reliable and durable. Generally speaking, the larger the diameter of the drive unit, the better the performance of the earphone. At present, the maximum diameter of the drive unit in the consumer-grade earphone is 70mm, which is generally the flagship earmuff type earphone.
Moving Iron Headphones
The moving iron type is a sound-transmitting earphone that is conducted to a center point of a micro-diaphragm through a structurally rigid connecting rod. The moving iron earphones can be easily placed in the ear canal because the unit is much smaller. This practice effectively reduces the area of the ear portion into the deeper ear canal portion. The geometry of the ear canal is much simpler than that of the auricle. It belongs to a round shape, so a soft silicone sleeve can have good sound insulation and leakage prevention effect compared with the traditional earplug.
Circle Iron Hybrid Headphones
The ring iron hybrid Headphones is a dynamic moving iron hybrid driving sounding earphone. It has a single moving ring + single moving iron, single moving ring + double moving iron structure. The advantage of the moving iron unit is that the electroacoustic conversion efficiency is high and the vibration body is light, so High sensitivity and good transient performance make the dynamic and instantaneous details of the original dynamic circle difficult to express. The low frequency and intermediate frequency are naturally presented by the moving coil unit, which takes advantage of the dynamic low frequency dive depth and medium frequency clear and natural transition. The advantages and functions of the moving iron unit mainly undertake and complement the high-frequency attenuation section of the moving coil. Starting from the crossover point of 6 kHz, the moving iron unit is responsible for the high frequency and extends the high frequency range to 30 kHz .
Planar Magnetic Headphones
The driver of a magnetic headphone is similar to a reduced flat speaker, which embeds a flat voice coil in a thin diaphragm, like a printed circuit board, to distribute the driving force evenly. The magnets are concentrated on one or both sides of the diaphragm (push-pull), and the diaphragm vibrates in the magnetic field it forms. The magnet earphone diaphragm is not as light as the electrostatic earphone diaphragm, but has the same large vibration area and similar sound quality. It is not as efficient as a moving coil earphone and is not easy to drive.
The electrostatic headphones has a light and thin diaphragm that is polarized by a high DC voltage. The power required for polarization is converted by alternating current and battery powered. The diaphragm is suspended in an electrostatic field formed by two fixed metal plates (stators). The electrostatic headphones must use a special amplifier to convert the audio signal into a voltage signal of several hundred volts. The sound pressure level that can be reached is not The dynamic earphone is large, but its response speed is fast, it can reproduce various tiny details, and the distortion is extremely low.
They consist of two parts, a signal transmitter and an earphone with a signal receiving and amplifying device (usually moving coil type). The transmitter is connected to the signal source, and the front stage or headphone amplifier can be connected in front of the transmitter to improve the sound quality and adjust the tone.
A wireless headset generally refers to a headset system that transmits signals in infrared light, and a cordless headset refers to a headset system that transmits signals using radio waves. Infrared headphones operate from a few KHz to a few MHz, the effective distance is about 10 meters, the headphones should be in the visible range; the radio headphones operate at VHF 130MHz-200 MHz, UHF 450 MHz -900MHz, most cordless headphones work in UHF It can transmit up to 100 meters and can bypass obstacles. Two or more pairs of wireless/cordless headphones may interfere with each other, so it is best to choose a variety of operating frequencies when selecting them. For cordless headphones, working in UHF may be less disturbing than on VHF. Both headphones have background noise, and higher-end models use noise-reduction techniques. Also note that the battery life of the wireless / cordless headset should not be less than 8 hours.
Today's more advanced wireless headsets use Bluetooth 5.0 transmission with aptX technology to deliver advanced, CD-quality audio via Bluetooth.