Noise reduction methods of earphones
author: Holly
2022-12-16
Noise reduction methods of earphones
There are two noise reduction methods for earphones: active noise reduction and passive noise reduction.
The active noise reduction function is to neutralize the noise by generating an inverse acoustic wave equal to the external noise through the noise reduction system, so as to achieve the effect of noise reduction. Active noise reduction earphones are equipped with noise reduction circuits that can compete with external noise. Most of them adopt a large headworn design, which can block external noise by using earplug cotton and earphone shell and other structures for the first round of sound insulation. At the same time, active noise reduction circuits and power supplies are installed in order to have sufficient space.
Passive noise reduction earphones mainly form a closed space by surrounding the ears, or use sound insulation materials such as silicone earplugs to block external noise. Because the noise is not processed by the noise reduction circuit chip, it can only block high-frequency noise, and the effect of noise reduction for low-frequency noise is not obvious. usb headsets with microphone for pc.
The three noise reduction measures commonly used to reduce noise, namely, noise reduction at the sound source, noise reduction during transmission and noise reduction at the human ear, are all passive. In order to actively eliminate noise, people invented the technology of "active noise elimination". Its principle is that all sounds heard are sound waves, which have a certain spectrum composition. If a sound wave can be found, its frequency spectrum is equal to the noise amplitude to be eliminated, and its phase is just opposite (difference is 180 °), the noise can be completely eliminated by superposition of the two. The key is how to get the noise canceling sound. The actual method is: start from 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 loudspeaker. From this point of view, the technology of active noise reduction is actually "fighting poison with poison".
When dealing with complex noise environment, the two MEMS microphones of "active noise reduction" will respectively pick up intra ear noise and various external environmental noise, equipped with an independent intelligent high-definition noise reduction processor, which can perform high-speed calculation on different noises picked up, and accurately eliminate noise. In addition, according to the noise reduction requirements of different scenes, the headset provides multiple listening modes: strong and weak active noise reduction mode and an ambient sound mode. Isolate external noise to varying degrees and eliminate the "black hole feeling" when listening to common noise reduction earphones.
The active noise reduction function is to neutralize the noise by generating an inverse acoustic wave equal to the external noise through the noise reduction system, so as to achieve the effect of noise reduction. Active noise reduction earphones are equipped with noise reduction circuits that can compete with external noise. Most of them adopt a large headworn design, which can block external noise by using earplug cotton and earphone shell and other structures for the first round of sound insulation. At the same time, active noise reduction circuits and power supplies are installed in order to have sufficient space.
Passive noise reduction earphones mainly form a closed space by surrounding the ears, or use sound insulation materials such as silicone earplugs to block external noise. Because the noise is not processed by the noise reduction circuit chip, it can only block high-frequency noise, and the effect of noise reduction for low-frequency noise is not obvious. usb headsets with microphone for pc.
The three noise reduction measures commonly used to reduce noise, namely, noise reduction at the sound source, noise reduction during transmission and noise reduction at the human ear, are all passive. In order to actively eliminate noise, people invented the technology of "active noise elimination". Its principle is that all sounds heard are sound waves, which have a certain spectrum composition. If a sound wave can be found, its frequency spectrum is equal to the noise amplitude to be eliminated, and its phase is just opposite (difference is 180 °), the noise can be completely eliminated by superposition of the two. The key is how to get the noise canceling sound. The actual method is: start from 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 loudspeaker. From this point of view, the technology of active noise reduction is actually "fighting poison with poison".
When dealing with complex noise environment, the two MEMS microphones of "active noise reduction" will respectively pick up intra ear noise and various external environmental noise, equipped with an independent intelligent high-definition noise reduction processor, which can perform high-speed calculation on different noises picked up, and accurately eliminate noise. In addition, according to the noise reduction requirements of different scenes, the headset provides multiple listening modes: strong and weak active noise reduction mode and an ambient sound mode. Isolate external noise to varying degrees and eliminate the "black hole feeling" when listening to common noise reduction earphones.
