Are active noise cancelling headphones harmful to the human ear and why?

The active noise reduction function is to neutralize the noise by generating a reverse sound wave equal to the external noise through the noise reduction system, so as to achieve the effect of noise reduction. The three types of noise reduction measures that are commonly used to reduce noise, i.e., noise reduction at the sound source, noise reduction during propagation, and noise reduction at the human ear, are all passive. In order to proactively eliminate noise, the technology of "active noise reduction" was invented.

The principle is that all sounds are made up of a certain frequency spectrum, and if you can find a sound with the exact same spectrum as the noise you want to eliminate, but in exactly opposite phase (180° difference), you can completely cancel out the noise. It's all about getting the noise-canceling sound.

The actual method is to start from the noise source itself and try to reverse the phase of the original noise through the electronic circuit. From this point of view, the technology of active silencing is actually "fighting poison with poison".

Active Noise Cancelling Headphones** are expensive, but generally work well (except for the Philips entry-level toy) and are comfortable to wear. However, they require a separate battery to operate, and most ANC headphones can be used without draining power (nor with active noise cancellation). So it doesn't hurt much.

The principle of active noise cancelling headphones is to generate an inverting wave of external noise inside the headphones to counteract the impact of external noise, due to the reduction of external noise, the user will reduce the volume accordingly when listening to normal**, which is good for the ears. Active noise cancellation, there are also earbuds, he is a built-in noise cancelling circuit, and a microphone, now the ambient noise is picked up through the built-in microphone, and after analysis, the sound in the opposite direction is generated to offset the ambient noise However, the sound of most active noise cancelling headphones is far inferior to the passive noise cancellation (ordinary in-ear) headphones at the price point, mainly because his voice is processed And the active noise cancelling headphones are more expensive, slightly cheaper ones such as Sony's NC22, which also cost six or seven hundred yuan or even higher Therefore, it is still recommended to buy ordinary in-ear headphones, which is OK The sound isolation effect is still very good Brand goods range from more than 100 yuan to thousands of yuan The low-end mainly has Sennheiser AKG, Cyclone, VSOUND several brands, **Mainly below 300 yuan There are entry-level moving iron products at the middle price of six or seven hundred yuan, such as Westone, UE, Etymotic, Shure Several brands Most of the high-end products above 1,000 yuan are moving irons Some are multi-unit multi-division, There are only a few dynamic In addition, there are custom headphones, like the kind worn by artists who perform for thousands of yuan, and finally remind me that in-ear headphones should not be used for a long time, and it is best to take them off every half an hour to rest for a while, so that they will not put too much pressure on the ears And because they want to go deep into the ear canal, we should also pay attention to the hygiene of the headphones. <>

Active Noise Cancellation: It is a function in headphones that neutralizes the noise by generating a reverse sound wave equal to the outside noise through the noise cancellation system, so as to achieve the effect of noise cancellation. This noise reduction technology is an active noise reduction technology.

Sound is produced by the vibration of an object, and the propagation form of vibration in an elastic medium is sound waves, which are in a certain frequency range (20 20000Hz) and act on the human ear to produce the sensation of sound. Noise, often defined as "unwanted sound", is an environmental phenomenon. People are exposed to noise throughout their lives, and noise is also an environmental pollutant produced by various human activities.

Vibration is the reciprocating periodic motion of an object (or part of an object) along a straight line or curve through an equilibrium position. It is widely found in nature and in engineering. When using headphones with no noise cancellation function or poor noise cancellation in a noisy environment, such as on the subway or bus, the background noise is 80 decibels, and your ** should be put to 120 decibels to hear the same as when it is usually quiet.

Active noise cancelling headphones are relative to "passive" noise cancelling headphones (also called physical noise cancelling headphones), using the microphone on the earcup to collect external noise, through the noise reduction processing chip in the headphones analysis and processing, to create a spectrum and noise phase completely opposite sound, cancel out the noise, and the attenuation of the signal sound is very small, so you don't have to be loud to hear clearly, can protect hearing. Physical noise-cancelling headphones also have a protective effect on hearing, but they are generally less effective than active noise cancellation. And because it completely blocks out all outside sounds (if it works), it can be inconvenient or even dangerous (e.g. on a busy street).

However, even if you use noise-canceling headphones, don't be greedy, wearing headphones to fall asleep** ringing in your ears overnight, the loudness is not loud will also hurt your hearing. The opposite sound wave is used to cancel out the outside world, not to the ear. You don't understand.

For the time being, the available data has not yet clarified the harm of noise cancellation to the ears. But it is clear that in a high-noise environment, it is still no problem to protect the ears. <>

The damage is as follows:Active noise cancelling headphones generally do not harm the ears or brain, usually must avoid going to a noisy environment, but also to avoid looking at the computer and mobile phone for a long time, the vision of the ears and eyes, will cause a certain impact, usually must pay more attention to rest, maintain sufficient sleep, can ensure 8 hours a day, avoid staying up late.

Introduction:

The headset is a pair of conversion units, which accept the signal sent by the **** device or receiver, and use the speaker close to the ear to convert it into audible sound waves. The headphones can be separated from the **** device, and can be connected with only one plug, so that you can listen to the sound alone without affecting others; It can also isolate the sound of the surrounding environment.

It is very helpful for people who use it in noisy environments such as recording studios, bars, travel, sports, etc. Headphones were originally used for ** and radio, but with the prevalence of portable electronic devices, headphones are mostly used in mobile phones, walkmans, radios, portable video games and digital audio ** devices.

Headphones are better for active noise cancelling headphones.

Passive noise reduction refers to physical noise reduction, ordinary in-ear headphones and headphones have a certain sound isolation effect, so they have physical noise reduction functions, but the noise reduction effect is limited, excessive increase in the level of physical noise reduction can only reduce the wearing comfort, and the choice of active noise cancellation headphones can ensure wearing comfort at the same time, have a better noise reduction effect.

The headset is a pair of conversion units, receiving the signal sent from the **** device or receiver, using the speaker close to the ear to transfer it into an audible sound wave, the headset can be separated from the **** device, and it can be connected with a plug, which can be used without affecting others, listening to the sound alone, and it is very helpful for people who use it in a noisy environment.

Precautions for the use of headphones:

1. Be sure to turn off the volume before use, the volume of the output device is too large, not only shocking the ears, but also the light diaphragm folds.

2. If the earphones are far away from strong magnets, the magnetism of the unit will decrease, and the sensitivity will decrease over time.

3. Keep the earphones away from moisture, the hail shield pad in the earphone unit will rust, and the resistance will increase, and your earphones will be biased.

4. It is best not to use it outside in winter, it is cold in winter, the wire is relatively hard and brittle, and it is easy to break the wire by excessive bending.