How ANC (active noise cancelling) works
Active Noise Control (ANC), Active Noise Cancelling, and Active Noise Reduction (ANR) are methods where an unwanted sound is reduced by adding another sound specifically made to cancel it out. Our active noise cancelling earbuds use a microphone to sample the sound, and a speaker to create a phase-shifted sound that cancels the original sound.
The performance of QuietOn 3 Active Noise Cancelling earbuds compared to that of conventional foam earplugs is visualized in the graph below. No silence created, but optimal environment for sleeping.
The graph illustrates how well passive and active noise cancelling reduce the noise. It depicts the noise amplitude in the frequency scale, throughout the entire sound spectrum, but especially in the range between 200-800Hz active noise cancelling is particularly effective.
Passive noise cancelling devices such as foam earplugs perform well for frequencies over 1kHz, however they are not working effectively in the range where you would need them most: Low frequency noise waves, which are long and go through the walls and earplugs.
The solution for those is active noise cancelling – The graph demonstrates how well the low frequency noise is reduced with QuietOn 3. Yet, ANC does have limitations and no ANC device works well over 2kHz frequencies. It is just the law of physics processing and audio components have delays.
That’s why QuietOn’s unique approach of combining ANC and passive noise reduction gives the best possible results when you can not sleep because of sleep disturbance.
Here you can learn more about the performance tests our earbuds go through, to ensure that we offer nothing but technological excellence to you.