Active noise reduction suppresses noise electronically

Active hearing protection and Active noise reduction, what is the difference?

Active hearing protection has become very common in today's noisy industries and workplaces. Active hearing protection dampens noise in the same way as traditional and simpler passive hearing protection. In addition, active hearing protection has a built-in microphone that amplifies the speech frequencies, called active listening, where noise over about 80 dB are blocked by the microphone so as not to damage the hearing.

Active noise reduction is a new way to protect your hearing in noisy workplaces. The technology not only blocks the noise, but analyzes and electronically counteracts the harmful sound waves. It provides a number of different protection benefits for the hearing, including reducing harmful noise even if the hearing protection is not tight around the ear.

Active noise reduction or Active noise canceling is a sound technology that electronically reduces noise. The technology has long been used in headphones to reduce background noise.

Knocks out sound waves

Headphones with active noise reduction have built-in microphones that pick up noise and speakers that emit sound waves. The microphones pick up the sound that should be muted. A digital processor measures and analyzes the sound so that the speaker can then send out a sound that mirrors and thus counters the harmful sound. In practice, active noise reduction works best at low frequencies and when combined with passive noise reduction.

The ultimate protection against harmful noise.

A common misunderstaning is that all headphones with active noise canceling are built in the same way. Active noise reduction is by no means a new technology. It has been in the military for many years, can be found as an alternative in music headphones and now it is also available in industrial hearing protection.

Three different types of active noise reduction

Feed forward anc

Microphones on the outside

As the microphone is located on the outside of the cover, it takes longer to adjust the mirroring sound waves

The processor cannot correct the countering sound waves in the event of leakage. The sensitivity to wind is also greater

Feedback anc

Microphones on the inside

The microphone perceives exactly the sound that reaches the ear and therefore adjusts their sound curve based on any leakage.

The microphone has less time to process the countering curve. Compared to Feed Forward it has a lower efficiency against high frequencies

Hybrid anc

Microphones on the inside and outside

The best of two worlds! The inner microphone can adjust / correct the sound generated by the outer microphone

A more technically complex solution

News for construction and industry

Guardio Auris combines both passive and active hearing protection, and they are equipped with Active Noise Reduction. They are developed with Hybrid ANC, where the signals from the two different microphones are analyzed and calibrated to send a mirrored sound wave that knocks out the harmful sound. In this way, it can suppress sounds on a larger number of frequencies, adapt and correct errors more easily.

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Questions and answers about Active Noise Reduction

What is Active Noise Reduction?

Active noise reduction is a technology that involves active sound suppression using speakers. The principle is that sound waves are countered with mirroring sound waves , so that the result is silent.

What are the differences between Active Noise Reduction and Active Hearing Protection?

Active hearing protection blocks sounds at higher frequencies. Active noise reduction not only blocks, but sends a mirrored sound wave against the noise

What are the benefits of Active Noise Reduction?

Active noise reduction is said to contribute to reduced stress and higher focus, due to the fact that they reduce continuous noise for the user

Is active noise reduction effective against all noise?

No. Impulse noise, ie sudden bangs, are suppressed better by passive noise reduction as it takes a few hundredths of a second for the active noise reduction to calibrate the attenuation. Therefore, Guardio has chosen to combine both technologies in their hearing protection and thus get the best of both worlds.