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Various principles of the advantages and disadvantages of headphones

In general headphones are divided into five categories: piezoelectric headphones, moving headphones, moving headphones, static headphones, pneumatic headphones. Piezoelectric headphones: the use of piezoelectric ceramic piezoelectric effect sound. High efficiency, high frequency. Disadvantages: distortion, high drive voltage, low frequency response, poor impact resistance. This type of headset for telegraph transmission and use, is basically beats by dre wireless eliminated. A few headphones beats by dre studio use piezoelectric ceramics as a treble sound unit. Moving iron: the use of the electromagnet to produce alternating magnetic field, the vibration part is an iron plate suspended in front of the electromagnet, the signal through the electromagnet when the electromagnetic field will change the electromagnet, so that iron sound vibration. The advantage is long service life and high efficiency. The disadvantage is distortion, frequency response narrow. Often used in the early telephone handset. Moving headphones: This is now the most common form of headphones. The coil is fixed on the diaphragm, placed in the fixed magnetic field generated by the permanent magnet, the signal through the coil cutting magnetic field lines, so as to drive the diaphragm with vibration sound. The advantage is that the production is relatively easy, good linearity, distortion is small, wide frequency response. The disadvantage is inefficiency (not a shortcoming). Electrostatic headphones: also known as electrostatic cheap beats plane diaphragm, aluminum (or other conductive metal) coil directly plated or printed on a thin plastic film, placed in a strong electrostatic field (usually by the DC high voltage generator and fixed metal Film (network) composition), the signal through the coil when the cutting electric field, driven diaphragm vibration sound. The advantages of good linearity, distortion is small (electric field than the magnetic field uniform), transient response is good (diaphragm quality light), high frequency response. The disadvantage is that low-frequency response is not good, the need for specialized drive circuit and electrostatic generator, expensive. Efficiency is not high.

Pneumatic headphones: the use of air pumps and valves to control the air flow, direct control of air pressure and flow, making the air vibration. Sometimes the valve to use high-power speakers instead. A headset is often used on aircraft, and this headset is actually just an airway. The advantages of no electric drive, infinitely parallel, high efficiency. The disadvantage is distortion, frequency response is narrow, there is noise. Moving headphones: is now the most widely used production cheap beats headphones, according to the purpose of different use, divided into many types, different manufacturers of different headset technical characteristics, have their own characteristics.