The so-called noise reduction headphones , for some headphone enthusiasts is still relatively understand, noise reduction headphones is nothing more than a rubber plug in the headphone of the strict point, a little tight sponge thick point only, in fact, this is a very passive noise reduction principle, if For some occasions where the decibels are larger, this so-called noise reduction headset is nothing more than a glass of water.
There is actually a higher-end noise-reducing headphone that counteracts noise in the outside world and music (active noise cancellation) through certain algorithms. Such headphones are called "active noise canceling headphones." The difference between the two is: passive high frequency, active frequency reduction.
Use noise to cancel noise
The principle of passive noise reduction headphones naturally does not have to say, by increasing the sponge, rubber and other sealed materials as much as possible to isolate the ear canal from the outside, so as to play a role in reducing noise. However, it is worth noting that this noise reduction method can effectively block external high-frequency noise, but the blocking effect of low-frequency noise is not obvious.
It is because of various problems that passive noise reduction technology seems to be less satisfactory for many music enthusiasts. Active noise reduction headphones have emerged. Different from the passive type, the active noise canceling headphones block out the external noise at the same time, but they emit another kind of noise. The two noises are mutually neutralized, but they achieve the purpose of noise reduction.
The active noise canceling headphones are active noise reduction, and generally a battery (usually a rechargeable lithium battery or a AAA 7 battery) and a noise reduction circuit are added to the headphone line. Driven by the battery, the noise reduction circuit uses a built-in microphone to pick up the low-frequency noise (basically between 100-1000 Hz frequencies) in the environment, and after calculation, tries to emit sound waves with the same phase as the noise and with the same amplitude. The positive and negative sound waves cancel each other exactly and the low-frequency noise disappears magically.
Active noise reduction solves the problem of low-frequency noise, but it is not a good choice to get high-frequency noise, noise emitted in vocal, aircraft or train scenes, and active noise reduction headphones are difficult to deal with completely. On the other hand, if the active noise canceling headphones do not work well, it may cause loss of sound quality, which is a test of the skill of manufacturers.
It should be noted that the most urgent need of most users is to block low-frequency noise. Vocals, car horns, etc. are all high frequencies. When we use headphones, we often worry that we cannot hear people. When we cross the street, we must also be sensitive to hearing. In turn, low-frequency sounds are almost all real "noise." In this case, the advantage of active noise canceling headphones is very obvious.
Which one is active or passive?
When that comes back, what kind of noise canceling headphones is better? In fact, the focus is still one sentence: active noise reduction headphones are generally more expensive. If everyone has a limited budget, buy a headset with better sound insulation, and vice versa, active noise cancelling headphones are more suitable for purchase. Many active noise canceling headphones also have the effect of passive noise reduction. Such products are often expensive, and of course the noise reduction effect is also the best.
In addition, actively reduce the frequency, passive high frequency. For users who often listen to music on the road, it is more recommended to purchase ordinary headphones or active noise reduction headphones, so that users can still hear whistle, yelling and other higher sounds while wearing, which is conducive to safer travel. Users who often sit in the public office (low-frequency noise is low) can hardly hear the low-frequency noise in these environments. Active noise reduction has almost no effect, and it is more suitable for ordinary headphones with better sound insulation. Now. PS: When Boss calls you, you can't hear it...
Can cheap noise reduction headphones be started?
Recently, many manufacturers have introduced low-cost active noise reduction headphones for their own mobile phones. The ability of these headphones to reduce noise is also very prominent, especially in the street, low-frequency noise filtering effect is very obvious. The sound quality of the headset itself is in line with its price level. For users who are not pursuing Hi-Fi and will not be dying of sound details, the noise reduction function can most directly improve the purity of the music. If you like, you can buy one to try. But for music enthusiasts, these headsets are not suitable.
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