What does active noise reduction mean?

Active noise reduction is a noise reduction technology and one of the noise reduction methods applied to headphones. In order to actively eliminate noise, people invented the "active noise elimination" technology.

The essence of sound is vibration. When two identical sound waves meet, they will overlap each other to form a bigger sound wave.

But if two sound waves with opposite vibration directions meet, they will cancel each other out. Active noise reduction headphones make use of this principle.

There is a microphone outside the earphone to continuously collect the noise in the environment, and the chip inside the earphone will analyze the collected noise and produce anti-noise opposite to the noise sound wave. When the noise finally propagates near the earphone speaker, the earphone speaker can play anti-noise to offset the noise, thus achieving the purpose of noise reduction.

Application of active noise reduction in automobiles;

Cadillac is the first brand to apply active noise reduction technology to the automotive field.

Cadillac XTS luxury car 20 13 was listed in China in the first quarter, and its BOSE? 5. The advanced surround sound system of1is equipped with active noise reduction and mute system (ANC). Noise samples are collected by the microphone in the car. After systematic analysis and processing, the speaker of the car stereo plays the opposite audio, which cancels the noise wave and creates a quieter interior atmosphere.