Noise, also known as noise, is an unwelcome sound that annoys people and nature who hear it. The sounds that affect people's work and study are called noise. The perception of noise differs according to each person's feelings, habits, etc., so noise is sometimes a subjective feeling. Generally speaking, people call environmental sounds that affect people's conversation or thinking as noise.
Definition of noise canceling headphones
Noise-cancelling headphones refer to a type of headphones that uses a certain method to reduce noise. At present, there are two types of noise reduction headphones: active noise reduction headphones and passive noise reduction headphones.
The active noise reduction function is to generate a reverse sound wave equal to the external noise through the noise reduction system, and neutralize the noise to achieve the effect of noise reduction. Passive noise-reduction headphones mainly form a closed space by surrounding the ears, or use soundproof materials such as silicone earplugs to block external noise.
The difference between active noise reduction and passive noise reduction headphones
Passive noise reduction (sound insulation and noise reduction)
From the principle of noise reduction, passive noise reduction is to fill the ear cup with sponge, to isolate the noise through the ear cup and the sponge, there are certain requirements for the clamping force of the ear cup, if there is a gap between the ear cup and the ear, The noise reduction effect will be much worse. Active noise reduction is to set an intelligent noise reduction chip in the ear cup. When the built-in sound pickup sensor of the earphone senses the external noise, the intelligent circuit will generate a sound wave opposite to the external noise to cancel out the noise.
From the price point of view, passive noise reduction is simple and cheap to make, generally it can be purchased from tens of yuan to one or two hundred. Active noise canceling headphones have high technical requirements, and the price is generally more than 1,000 yuan.
From an application point of view, passive noise-cancelling headphones can be used as labor protection headphones in factories, construction sites and other occasions. It is not easy to communicate with people next to you while wearing noise-cancelling headphones. Active noise-cancelling headphones, while shielding from huge noises, can also perceive small sounds without affecting communication, and are generally used in military, airport and other occasions.
In terms of noise frequency, passive noise reduction shields high-frequency noise, which is more suitable for some more regular noise reduction scenes, which is achieved by stacking soundproof materials. However, it is difficult to deal with the complex environment and a large amount of low-frequency resonance noise. Active noise reduction can pick up sound through the microphone, which can effectively deal with the noise of complex environments, such as the interior of the car and the cabin. Therefore, under certain conditions, the advantages of active noise reduction are extremely obvious. Active noise reduction has a significant effect on the elimination of low-frequency noise signals, especially air conditioning, engine and other noise. It can reduce the environmental noise of 25dB-30dB at most. Compared with passive noise reduction, the effect of active noise reduction is more intelligent.
In terms of sound quality, active noise reduction adds noise reduction processing signals to the original music, which will inevitably cause the influence of music purity to form sound stains. Noise reduction processing chips and sound pickup microphones will have errors in their work, causing some non-noise signals to be cancelled. This is also the reason why many users find that the sound details of active noise canceling headphones are not enough and they feel bored.
Active noise reduction
Active noise reduction technology has been developed for decades, the technology has been continuously mature, and is gradually extending from high-end applications to the civilian market, and the application environment is also diverse. The most fundamental thing is that, compared with passive noise reduction materials, the processing mechanism of active noise reduction has more room for improvement. However, the technical blockade is the biggest headache for the industry. At present, several companies in the industry that have active noise reduction core technologies will not disclose their own technologies. The technical blockade is obviously not conducive to the development of the industry.
However, this has not been able to develop noise reduction. At present, there are some domestic brands that have independently developed active noise reduction technology, and will actively promote active noise reduction headset products this year. The environment we are facing is becoming more and more complex, and the environment in life is getting bigger and bigger. It is the only purpose to bring noise-reducing headphones to the people and bring them to the mass consumer level.
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