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2021-02-25 452
Headphones, as the name implies, are worn on the head, not inserted into the ear canal, and are different from earphones. It is composed of two parts, a signal transmitter and a headset (usually a moving coil) with a signal receiving and amplifying device.
The transmitter is connected to the signal source, and a preamp or headphone amplifier can also be connected in front of the transmitter to improve the sound quality and adjust the tone.

1: Good sound field and good comfort.
2: Do not enter the ear, avoid scratching the ear canal
3: Compared with in-ear earplugs, it can listen for a longer time
1: The bass effect of some headphones is not very good
2: Inconvenient to carry
3: Power consumption

the difference
The biggest advantage of the in-ear type is that it saves electricity, and ordinary mp3 can be driven, and then it can avoid environmental noise. After all, the ears are blocked while listening to music. The main reason for the poor bass of headphones is that the sound unit reduces the cost, and some headphones have powerful bass, but they require computer CD and other equipment to drive, and the mp3 drive does not have the bass effect.
It is recommended to use the head-mounted type for the health angle. The in-ear type has an impact on hearing. Do not wear more than half an hour at a time.
In summary, if you use low-power appliances such as mp3, it is recommended to use ear-mounted devices. You can consider brands such as Sony, Audio-Technica, and Sennheiser. If you emphasize sound quality and focus on enjoyment, you can consider head-mounted devices for listening to music on a computer. It is not an exaggeration to feel the atmosphere of Dolby 5.1. But the driving current must be sufficient, and mp3 must be used with an amp, which is a headphone amplifier.

Wireless Headphones

A wireless headset generally refers to a headset system that transmits signals by infrared rays, and a cordless headset refers to a headset system that uses radio waves to transmit signals. The working frequency of infrared earphones ranges from a few KHz to a few MHz, and the effective distance is about 10 meters. The earphones must be within the visual range; the working frequencies of the radio earphones are VHF 130MHz-200 MHz, UHF 450 MHz -900MHz, and most cordless earphones work on UHF , The transmission range is up to 100 meters, and obstacles can be bypassed. Two or more wireless/cordless headsets may interfere with each other, so it is best to choose a variety with multiple operating frequencies when choosing them. For cordless headsets, the interference may be less when working on UHF than on VHF. Both headsets have background noise, and higher-end models have adopted noise reduction technology. Also note that the battery life of the wireless/cordless headset should generally not be higher than 8 hours.


the reason
This symptom is normal!
After a person puts on the earphone, the channel opening of the outer ear is tightly plugged by the earphone and is almost in a blocked state. The high-volume audio sound pressure directly enters the ear and is concentrated on the thin eardrum. There is no room for buffering, and the auditory nerve is Exciting excitement can easily cause hearing fatigue. So there are symptoms of ear pain after wearing headphones for a long time!
Whether wearing earphones can cause hearing impairment is controversial in the current medical research. The reason is that the length of time and the volume of each person are inconsistent, so effective observation and judgment cannot be made. But one thing worthy of affirmation is that if you wear headphones for a long time to listen to music without paying attention to ear maintenance, your hearing will be affected. Compared with the loudspeaker, the vibrating plate of the earphone is closer to the eardrum, although it is more pleasant, it is more direct to the ear. Although almost all earphone designs have adopted "open" earphones to reduce hearing damage, long-term use can still cause damage, which may cause poor blood circulation, tinnitus, inner ear hair cell necrosis and even auditory nerve damage, especially for some people. Turning up the volume of the music in order to offset the external noise is even worse.
Frequent wearing of headphones will damage your ears. Generally speaking, the following principles should be paid attention to when using headphones:
1. Don't wear headphones for a long time
2. Don't turn on the volume too much. If someone from a meter away cannot hear you clearly, you should lower the volume of the headset.
3. Choose headphones that are comfortable to wear.
4. The earphones should be of good quality, low noise, and the volume can be adjusted.
5.Don't listen to things with headphones for a long time. Let your ears rest every half an hour. The maximum time is no more than three hours a day, the less the better.
6. Do not listen while sleeping. Due to the influence of sleeping posture, the pillow puts pressure on the earplugs, which causes physical damage to the eardrum.
7.It is best to use over-ear headphones, because this kind of earphones is less harmful to the ears than embedded headphones.
In addition, earphones are closer to the eardrum than earmuffs, and stimulate the eardrum more directly, which may have a greater impact on the ears.

Headphone classification
1. According to the working principle
Mainly there are two types of dynamic and electrostatic headphones. Although there are several types of equal magnetic types in addition to these two types, they have either been eliminated or used for professional use. The market share is very small. , Do not discuss here.
Moving coil earphones: At present, most (about 99%) earphone earplugs fall into this category. The principle is similar to that of ordinary speakers. The coil in a permanent magnetic field is connected to the diaphragm, and the coil drives the diaphragm to sound under the signal current.
Electrostatic earphones: The diaphragm is in a changing electric field. The diaphragm is extremely thin and accurate to a few microns (currently, STAX's new generation of electrostatic earphone diaphragms are accurate to 1.35 microns). The coil drives the diaphragm to sound under the electric field force.
2: According to the degree of openness
Mainly open, semi-open, closed (closed)
Open earphones generally have a natural sense of hearing and are comfortable to wear. HIFI earphones that are commonly seen at home can leak sound, and vice versa, the outside world can also be heard. The earphones exert less pressure on the ears.
Semi-open: There are no strict regulations, and the sound can only enter but not exit, or only exit but not enter. Adjust accordingly as needed.
Closed type: The earmuffs put a lot of pressure on the ears to prevent the sound from entering and leaving, and the sound is positioned correctly. This is more common in the professional monitoring field. However, this type of earphone has a disadvantage of serious bass sound. W100 is an obvious example.
3: According to purpose
Mainly used for home (Home), portable (Portable), monitor (Monitor), mixing (Mix), head record (Binaural Recording) these categories.
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