Find here details of Noise Canceling Headsets on our website. Today we would like to talk about classification of noise canceling headphones.
There are two ways to reduce noise in headphones, active noise reduction and passive noise reduction.
The active noise reduction function is to generate a reverse sound wave equal to the external noise through the noise reduction system, neutralize the noise, and achieve the effect of noise reduction. Active noise canceling headphones with noise-reducing circuits that compete with external noise. Most of them use a large head-mounted design, which can be used to block external noise by using earplugs and earphone casings, for the first round of sound insulation, and also for There is plenty of room to install active noise reduction circuits and power supplies.
As a Noise Canceling Headphones Factory, we know that the passive noise canceling earphone mainly forms an enclosed space by surrounding the ear, or uses a soundproof material such as a silicone earplug to block external noise. Since the noise is not processed by the noise reduction circuit chip, generally only high frequency noise is blocked, and the noise reduction effect on the low frequency noise is not obvious.
The three noise reduction measures commonly used to reduce noise, namely noise reduction at the sound source, noise reduction during propagation, and noise reduction at the human ear, are passive. In order to actively eliminate noise, people have invented the technology of "active noise reduction". Its principle is: all the sounds heard are sound waves, and they all have a certain spectrum. If an acoustic wave can be found, its spectrum is equal to the amplitude of the noise to be cancelled, and the phase is just the opposite (180° difference), and the superposition of the two can completely cancel the noise. The key is how to get the sound that cancels the noise. The actual method is to start with the noise itself, monitor the noise with a microphone, and then try to generate a reverse sound wave through the electronic circuit and play it through the speaker. From this point of view, the technology of active noise reduction is actually "to attack with poison".
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