The Principle Of Noise Cancelling Headphones

Today, the Bluetooth Earphone Manufacturer will tell you the principle of a noise reduction headset.

There are two methods of noise reduction for headphones, active noise reduction and passive noise reduction. The active noise reduction function is to generate a reverse sound wave equal to the external noise through the noise reduction system to neutralize the noise, thereby achieving the effect of noise reduction. Active noise-cancelling earphones have noise-reduction circuits that compete with external noise. Most of them use large-volume head-mounted designs. They can use earplug cotton and earphone shells to block external noise, and perform the first round of sound insulation. There is ample space for active noise reduction circuits and power supplies.

Passive noise-cancelling headphones mainly form a closed space by surrounding the ear, or use sound-proof materials such as silicone earplugs to block external noise. Because the noise is not processed by the noise reduction circuit chip, generally only high frequency noise can be blocked, and the noise reduction effect on low frequency noise is not obvious.

The three noise reduction measures commonly used to reduce noise, namely noise reduction at the sound source, noise reduction during propagation, and noise reduction at the human ear, are all passive. In order to actively eliminate noise, people have invented the "active noise cancellation" technology. Its principle is that all the sounds heard are sound waves and have a certain frequency spectrum composition. If a sound wave can be found, its frequency spectrum is equal to the amplitude of the noise to be eliminated, and the phase is just opposite. The two can be superimposed to completely cancel out the noise. The key is how to get the sound that cancels the noise. The practical method is to start with 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 speaker.

When dealing with complex noise environments, the "active noise reduction" microphone will pick up the in-ear noise and various external environmental noises separately. It is equipped with an independent intelligent HD noise reduction processor that performs high-speed calculations on different noises picked up and accurately eliminates noise . And according to the noise reduction requirements of different scenes, the headset provides multiple listening modes: strong and weak two-stage active noise reduction mode and an ambient sound mode. Isolate external noise to varying degrees, eliminating the "black hole" of common noise-cancelling headphones.

Noise Canceling Headsets

Noise Canceling Headsets uses active noise control, which is different from the passive sound insulation of ordinary headphones. The principle is:

1. The low-frequency noise in the environment that can be heard by the ear is detected by a signal microphone placed in the earphone.

2. Pass the noise signal to the control circuit, and the control circuit performs real-time calculation.

3. Cancel the noise by playing a sound wave with the opposite phase and the same amplitude through the speaker.

4. Noise disappears after superimposing.

Generally speaking, the noise reduction headset is suitable for business people. Because of frequent business trips, especially business people who travel between different cities every day, they must hate the noise in the cabin. If you have a noise-cancelling headset, you must be able to stay away from these noises and relax by listening to music.

Of course there are subway families. The office workers who squeeze the subway every day are probably accustomed to the noise in the subway, but if you can have a pair of noise reduction headphones at this time, you can not only keep away from the noise, but also adjust the mood through the headphones, and enjoy this with happiness process.

Office workers also need a pair of noise-cancelling headphones. Sometimes when thinking about the plan, I am particularly upset listening to the sound of the central air-conditioning operation. At this time, I might as well put on a pair of noise-cancelling headphones to expand my thinking in beautiful music.

The above is the principle of noise-cancelling headphones introduced by the Sports Wireless Headset supplier. Hope to help you.