How are headphones classified
1.According to the principle of energy conversion
It is mainly composed of Dynamic, Balanced Armature and Electrostatic headsets. Although there are several types such as magnetic and others, these three categories are still applicable, but they are still obsolete or used for professional purposes. Hi-fi has very little market share and will not be discussed here. Moving coil earphone: Most earphone earplugs are of this type. The principle is similar to ordinary speakers.
·
2.according to the structure of earphone cavity
Mainly open, semi-open, closed (closed). (1) Open: HIFI earphones with natural listening feeling and comfortable wearing are common at home. The sound can be leaked and the outside sound can also be heard conversely. The earphones have less pressure on the ear.(2) semi-open: there are no strict provisions, the sound can only go out can also only go out, according to the need to make corresponding adjustments.(3) Closed: the ear muff is more compressed to the ear to prevent sound from coming in and out, and the sound is correctly positioned clearly, which is common in the field of professional monitoring.
. Parameters related to earphones
1. Impedance
Pay attention to the difference between meaning and resistance, in the world of direct current (DC), the object in the current block is called resistance, but in the field of alternating current (AC) besides resistance prevents current, capacitance and inductance would obstruct the flow of electric current, this effect is called the reactance, and our daily said is the impedance of the resistance and reactance and on vector.
2. Sensitivity
Sound pressure level (the unit of sound pressure is decibels. The higher the sound pressure, the greater the volume). Therefore, the higher the sensitivity and the lower the impedance, the easier the headset is to make noise and drive.
3.Frequency Response
The sensitivity value corresponding to the frequency is the frequency response, and the graph is the frequency response curve. The range that human hearing can reach is about 20HZ-2000Hz, and the mature earphone technology at present has reached this requirement.
