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D Building,Pioneer Park,3rd Industrial Zone Fenghuang Village, Fuyong Town,Baoan DistrictShenzhen,Guangdong,China
What is the noise reduction principle of active noise cancelling earbuds?
Noise reduction headphones are divided into two categories: passive noise reduction and active noise reduction.
Passive noise reduction is the use of very thick earmuffs to block outside noise. This method is very simple, it is to choose the acoustic material that absorbs sound well. However, they are relatively large, and the price is related to the materials used.
Active noise reduction headphones are much more complicated than ordinary headphones. A noise reduction module needs to be built in the headphones. It contains a microphone to receive external noise. After calculation by the internal circuit, it is added and added while the headphones are playing music. The sound wave of the "inverse" of the external noise, thereby canceling the external noise. Due to the complex structure and working principle of active noise reduction headphones, the price is generally much higher, most of which are in the price range of 1,000 yuan or more.
After the experiment, the experimenter said that we have done such a comparative study and found that bacteria generally reproduce asexually by a simple two-division method, and the division time is generally 20 to 30 minutes. Therefore, from this perspective, if you wear the headset for one hour, the bacteria can multiply by up to 5 times. If you don't wash it all year round, it will accelerate the bacteria's multiplication.
For music lovers, after purchasing headphones, whether at home or at work, they like to wear headphones for listening to music, but often wearing headphones will not Our hearing is harmful. So, what harm does wearing headphones do to hearing?
Welding the horn: the red core wire, green core or blue core wire is corresponding to the horn "+" pole welding (generally horn supplier "+" is dotted), the other yellow core wire is welded "-", and the welding quality is not acceptable Cold welding, false welding, false welding, etc. If the core wire is connected reversely, the phase of the earphone will be reversed. Everyone knows that the sound of the earphone with the reversed-phase is divergent. The earphone vibrates when in use. If there is cold welding or virtual welding, it will cause poor contact or directly become silent.
The principle of foldable active noise cancelling headphone is very simple. The propagation of sound is achieved through the vibration of the medium. If the waves are in antiphase, they will be cancelled under theoretical conditions. ANC will create a completely opposite sound through the processor to neutralize and eliminate the noise. This is called "destructive interference" in acoustics.
