Noise, also known as noise, is an unwelcome sound that causes people who hear it and the natural world to worry. The sound that affects people's work and study rest is called noise. The perception of noise varies with each person's feelings, habits, etc., so noise is sometimes a subjective feeling. In general, people refer to environmental sounds that affect people's conversations or thoughts as noise.
Noise Cancelling Headphone Definition
A noise canceling earphone is a type of earphone that uses some method to reduce noise. At present, there are two types of noise canceling headphones: active noise canceling headphones and passive noise canceling 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, thereby achieving the effect of noise reduction. Passive noise canceling headphones mainly form an enclosed space by surrounding the ear, 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 (seismic noise reduction)
From the principle of noise reduction, passive noise reduction is to fill the sponge inside the ear cup, and to isolate the noise through the ear cup and the sponge. There is a certain requirement on 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 up 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 generates a sound wave opposite to the external noise to offset the noise.
From the price point of view, passive noise reduction is simple to make, relatively cheap, usually tens of dollars to one or two hundred can be bought. Active noise canceling headphones have high technical requirements, and the price is generally more than 1,000 yuan.
From the application point of view, passive noise canceling headphones can be used as labor insurance headphones in factories, construction sites and other occasions. It is not good to communicate with people next to you when wearing noise-cancelling headphones. Active noise-cancelling headphones can also sense small sounds while shielding large noises, and do not affect communication. They are generally used in military, airport and other occasions.
From the noise frequency, passive noise reduction shields high-frequency noise, which is more suitable for some relatively regular noise reduction scenes, which are realized by stacking sound insulation materials. However, the environment is complicated, and a large amount of low-frequency resonance noise is at a loss. Active noise reduction through the microphone can effectively handle the noise of complex environments, such as in the car, the cabin and other environments. Therefore, under certain conditions, the advantages of active noise reduction are extremely obvious. Active noise reduction has obvious effects on the elimination of low-frequency noise signals, especially noise such as air conditioners and engines. Reduces ambient noise by up to 25dB-30dB. The effect of active noise reduction is more intelligent than passive noise reduction.
In terms of sound quality, active noise reduction adds noise reduction processing signals to the original music, which is bound to cause the influence of music purity to form sound and dye. The noise reduction processing chip and the pickup microphone may have errors in operation, and some non-noise signals are cancelled. This is why many users find that the sound details of the active noise canceling headphones are not enough and they are stuffy.
Active noise reduction
Active noise reduction technology has been developed for decades, and technology has matured. It is gradually extending from high-end applications to the civilian market, and the environment is also diverse. The most fundamental reason is that the active noise reduction processing mechanism enhances the space more than the passive noise reduction material science. However, the technical blockade is the most problematic problem in the industry. At present, several companies with active core noise reduction technology in the industry will not disclose their own technology. The technical blockade is obviously unfavorable to the development of the industry.
However, this is not the development of noise reduction. At present, some domestic brands have independently developed active noise reduction technology, and this year will vigorously promote active noise reduction headphones. The environment we are facing is becoming more and more complex, and the environment in our 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 class.
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