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What Is The Difference Between Active Noise Reduction And Passive Noise Reduction
The difference between active noise reduction and passive noise reduction is that active noise reduction is to cancel the noise through the hardware inside the earphone, while passive noise reduction is to isolate the ear from external noise through sound insulation materials.
Noise is an annoying and unwelcome sound. Noise can affect normal rest, study, work, and even health. Therefore, noise reduction has become a normal life requirement.
1. The importance of noise-canceling headphones
Modern society is fast-paced, all kinds of pollution are becoming more and more serious, and noise pollution is becoming more and more serious. We are surrounded by noise all the time in the open office environment, on the way to and from get off work, and during the trip. Noise reduction has become a rigid need. It can help us get rid of the interference of noise and establish an independent space. Noise-canceling headphones have become a necessity in daily life.
2. The principle of active noise reduction
Active noise reduction is to collect external noise through a microphone, and the noise reduction system generates a reverse sound wave equal to the external noise, neutralizes the noise, and achieves a true noise reduction effect. Simply put, the active noise reduction function is to make the noise disappear directly, rather than blocking it.
3. The principle of passive noise reduction
Passive noise reduction is the use of physical characteristics to isolate the ears from external noise. It is achieved by sound insulation materials. The principle of passive noise reduction is simple and the cost of noise reduction is also very low. Moreover, dynamic noise reduction is also relatively effective for high-frequency sounds. The noise can be reduced by about 15-20dB.
4. The biggest difference between the two headsets
Passive noise reduction is a kind of physical noise reduction. Like the in-ear headphones that most of us use are passive noise reduction headphones. The sound of this kind of headphones is emitted from the speaker and is directly transmitted into the ear through the guide mouth. The sound of listening to music will be more Pure. But its disadvantage is that this kind of noise-reducing headphones seals the external sound and is prone to safety hazards. This type of accident is estimated to be common to everyone.
Active noise reduction is to add an active noise reduction circuit to digital signal processing on the basis of passive noise reduction. After the circuit is processed, the noise reduction speaker can emit mechanical waves opposite to the noise phase to neutralize the noise. So as to achieve the effect of noise reduction.
The principle of active noise reduction headphones is the same, but the technology is still very different, and the noise reduction effect is naturally different. Therefore, the effects of noise-cancelling headphones manufactured are extremely different, each with its own advantages and characteristics. However, I personally believe that the only disadvantage of active noise-canceling headphones is that they are larger in weight and volume than ordinary headphones, but the biggest problem with active noise-canceling headphones is the price.
In fact, noise-canceling headphones were built for the purpose of protecting hearing and reducing noise. Then under this premise, both active noise reduction and passive noise reduction achieve this goal, but the effect of active noise reduction headphones is better, but the price is more expensive.