What Is an Earpiece?
Headphones, also called earphones or earphones , are a pair of conversion units that receive electrical signals from a media player or receiver and use speakers close to the ears to convert them into audible sound waves. The headset is generally detachable from the media player and is connected using a plug. The advantage is that you can listen to the sound alone without affecting others; it can also isolate the sound of the surrounding environment, which is very helpful for people who use in noisy environments such as recording studios, DJs, travels, sports (closed headphones) ).
- Distinguish by the principle of transduction
- Transducer is based on the sound driving method of the transducer used in the headset. It can be divided into dynamic and electrostatic, piezoelectric, moving iron, pneumatic, electromagnetic, etc. .
- Moving coil
- Dynamic headphones, also known as electric headphones. At present, most of the cheap ear canal earphones belong to this category. The principle is similar to that of electric speakers. A winding cylindrical coil in a permanent magnetic field is connected to the diaphragm. The coil drives the diaphragm to make sound under the driving of a signal current. Dynamic headphones differ from ordinary speakers in that the diaphragm is different. The edge of the diaphragm of a speaker is generally fixed on an elastic medium (folding ring and centering support) (such as on a large-diameter woofer). The diaphragm is generally It is flat and conical, and the vibration system is provided by an elastic medium.
- Because the earphones are closer to the inner ear tissue than ordinary external noise; users must take necessary protective measures. Studies show that hearing damage from pleasant music is minor, but long-term exposure to high-decibel sounds, whether music or noise, can cause hearing damage. Noise can cause sensory nerve hearing damage in the inner ear. When high-energy sound waves shake the fluid in the cochlea, they overstimulate and cause cell death. Hearing damage is formed over time. If you are exposed to noise for a long time, even if each time is short, it can cause hearing loss.
- An experiment conducted by the American Medical Association Journal in 1998 revealed that under long-term high noise levels, it has a negative impact on hearing.
- If you use headphones on the street, in addition to hearing damage caused by turning up the volume, focusing on listening to music can easily make users unconscious of peripheral sounds and increase the chance of danger. [3]
- Main article: List of headphone manufacturers