Active noise cancelling

Active noise control (ANC), active noise cancelling, and active noise reduction (ANR) are names of method where an unwanted sound is reduced by adding another sound specifically made to cancel it out.


QuietOn earplugs are optimized for dental use with strong noise reduction while enabling conversations with the patients. The above chart further illustrates the peak frequency examples of common dental clinic noise sources. QuietOn earplugs work well with low frequencies and are optimal in high frequency sounds.

Laboratory attenuation

QuietOn’s foam eartips (active)
Frequency (Hz) 63 125 250 500 1000 2000 4000 8000
Mean Attenuation (dB) 42 42 36 29 25 30 34 43

89/686EEC / PZT GmbH / An der Junkerei 48, D – 26389 Wilhelmshaven, Germany. Notified Body no. ‘1974’.

How it works

Active noise cancelling uses a microphone to sample the sound, and a speaker to create a phase-shifted sound that cancels the original sound. In QuietOn, the microphone that samples the sound is located right inside the ear canal! This means that QuietOn can more accurately produce anti-noise that results in good noise cancellation at the ear drum.

By locating the microphone in the air volume of the ear canal, QuietOn is also able to reduce noise that is conducted by the skull into the ear.

Do you know about sound frequencies & decibels

The frequency of a sound is characterized as a periodic vibration of air pressure. It is measured as vibrations per second, and it’s unit is hertz (Hz). Frequency is the property that determines pitch. It is generally accepted that a human can hear frequencies between 20 and 20,000 Hz, although the range of frequencies individuals hear is greatly influenced by age, hearing loss and the loudness of sound.

Sound pressure level (SPL) is a logarithmic measure of the pressure of a sound relative to reference of 20 micropascals which is the threshold of human hearing at 1000 Hz. This is defined as SPL of 0 dB. Every 10 dB increase in SPL is perceived roughly as doubling the loudness.

How quieton ANC earplugs perform across the whole audible spectrum

QuietOn can provide optimal noise reduction across the whole audible spectrum, especially effective at these low frequencies.

The average noise exposure during dental treatments is 76 dB (A) and momentarily 86 dB(A). The noise level of an ultrasonic scaler can reach even 107 dB (A). This can potentially harm one’s hearing. With active noise cancelling ability up to 40 dB, QuietOn effectively reduces the noise at dental clinics, while enabling communication between staff and patients.

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