ANC stands for Active Noise Cancellation, which is a noise reduction technology and one of the methods used in headphones to reduce noise. Since it is called active noise reduction technology, how does it reduce noise? Before understanding this problem, one thing we must know is that sound is produced by the vibration of the sound body and then propagated through a medium (such as air). The fluctuation of the water surface will produce water waves. china headphones Similarly, when sound propagates in the air, it will also produce sound waves. Sound waves of different frequencies can be divided into high frequency, intermediate frequency and low frequency. Then, the ANC noise reduction technology analyzes the sound waves of the noise, and then superimposes and neutralizes these sound waves by sending reverse sound waves, so as to achieve the effect of eliminating noise. It's like, one wave between two waves is similar to the other.
Therefore, ANC noise reduction headphones have a significant feature, that is, according to the characteristics of the original noise, the various characteristics of the control system can be designed and changed accordingly. In other words, ANC noise reduction detects low-frequency noise in the environment through the signal microphone, and then passes it to the control circuit for real-time calculation. According to the noise characteristics, the Hi-Fi speakers in the ANC noise reduction headphones will correspondingly emit sound waves with the opposite phase and the same amplitude to offset it. This kind of noise control has pertinence and pertinence, and provides basic conditions for achieving selective noise and improving sound quality.
With the construction of urban roads, bridges and various buildings, the impact of residential quarters on noise has gradually become prominent. For example, long-term exposure to low-frequency noise can easily cause various symptoms such as neurasthenia, insomnia, and headaches. All noise will cause a certain degree of harm to the human body, and low-frequency noise will have a long-term impact on human health. However, people have not paid enough attention to the harm caused by this low-frequency noise.
like：