On what type of headphone can this technology be implemented?

Originally developed for fighter pilots and then astronauts subjected to deafening noises during takeoff, active noise reduction has since been used in certain industries, in order to protect people working in particular environments. In this context, such protective equipment uses both passive and active reduction.

Does it cut off all the noise?

Active noise reduction is more effective with low-pitched sounds than high-pitched sounds. This is due to the fact, to use the image of the stone in the lake, that there are much less waves in a second of low pitch than in a second of high pitch, which is therefore easier to process. by the DSPs.

The frequency at which the “waves” follow one another in a second is denoted in Hertz (Hz). Below 1000 Hz, active noise reduction thus cuts out up to 85% of sounds. The more we go towards high-pitched sounds, the more the frequency will increase. DSPs will have more and more difficulty keeping up. For the same issues of responsiveness, noise reduction is more effective with constant sound.

In practice, therefore, active noise reduction works particularly well with engine sounds, wind tunnel sounds, buzzing, rolling train movements, aircraft engines, etc. A cry, for example, will not be eliminated, but hardly attenuated. Also for a conversation. On the other hand, the hubbub of a crowd as in a station hall will be better reduced, because it is a constant sound. This is all the more true with recent headphones, whose electronic circuit is programmed to recognize certain types of noise.

There are also in-ear headphones based on the same principle. Technology is changing rapidly, but as it is, a headphone is more effective.

When to use active noise canceling headphones?

The modern world generates more and more noise pollution. In the city, music lovers will therefore appreciate the possibility of being able to listen to music outside without disturbing noise. In this context, the use of headphones with active noise reduction is all the more pleasant as it also makes it possible to avoid having to listen to your music at high volume to isolate yourself, a bad reflex which further adds to hearing fatigue.

In the professional context, it can also be beneficial to be able to cut yourself off from outside noise. This is true in an open space, but also in the context of teleworking. Combined with a wrap-around headphone shape that also promotes passive isolation, active noise reduction can be very practical in this context. This is all the more true as some models are designed to be able to fight external sounds, even if you are not listening to music. A more than valuable asset for making a call or during a video conference.

What are the disadvantages of this technology?

The device consumes energy, so the models of wireless headphones with active noise reduction have less autonomy than their counterparts which are not equipped. Wired headsets therefore require a source of electricity. This translates into a need to recharge the headphones equipped with a battery or to change the battery, which is rarer. Adding all of this also means an increase in weight, although great progress have been achieved and there are now extremely lightweight true wireless (wired between them) and noise-canceling in-ear headphones.

When used outdoors, insulation can be a risk factor. Horns, bells and various alarms are not eliminated, but their attenuation nevertheless takes them into the background. As for the low sounds, they disappear completely. Not hearing the engine of an approaching vehicle when exiting a curb can have serious consequences.

How to choose active noise reduction headphones?

Since it is primarily an audio headset, check the sound quality, if possible, by listening to your favorite music before purchasing.

In a professional setting, pay attention to the quality of the microphone and ensure that noise reduction can work when making a call or video conference. 

Regarding the quality of noise reduction, the number of sensors is a good indicator. High-end models can have up to six sensors per headset. 

On recent headphones, different profiles corresponding to different types of noisy environment are memorized. Usually accessed through a smartphone app. 

Some models are equipped with a button to cut the active reduction directly without stopping the music.

What are the pitfalls to avoid when buying?

Find out about autonomy, recharging times. Be careful, some models cannot operate without power, unlike traditional Bluetooth headphones that can generally be continued to be used with a cable when they are discharged. If necessary, prefer models fitted with a standard 3.5mm jack plug. Taking into account battery, electronics, sensors, and microphone, pay attention to the total weight. And If the headphones can fold, even better.

What is the price of such a active noise reduction headphone?

The first entry-price models cost around a hundred euros and the upper range is between 300 and 400 euros.