Will noise-canceling headphones damage students' hearing?

Members of the Headphone party are still discussing the impact of thermal power and hydropower on sound quality, but someone has raised a new question, "In order to reduce noise, noise-cancelling headphones actively emit sound waves to cancel out noise. Will it actually cause greater hearing loss?"

Whether it is at work, traveling or resting, noise cancelling earbuds and earphones，listening to music with headphones has become an indispensable way of leisure in modern life.

But a noisy external environment, such as a noisy cabin, a roaring aircraft engine, a roadside advertising horn, and even a crying child, often affects our appreciation of music. Therefore, noise-cancelling earphone technology came into being.

Many people are also confused about this new thing that has just entered daily life:

What is the difference between noise-cancelling headphones and ordinary headphones? What about passive noise cancellation and active noise cancellation? Will wearing noise-cancelling headphones for a long time affect our hearing?

Today, let's talk about noise-cancelling headphones.

frequency of sound and noise

Before understanding headphones, let's talk about the frequency of the sound.

Usually, we divide the sound we hear into high, medium and low stages. 20~200Hz belongs to low frequency, 200~4000Hz belongs to intermediate frequency, and 4000~20000Hz belongs to high frequency.

Most of the daily noises are in the middle and low frequency stage, such as subways, high-speed trains, and aircraft noises. High-frequency noise in life is relatively small, but some warning sounds, such as car horns, have some high-frequency components.

In musical instrument teaching, the drum sound is a low-frequency pass sound, the bass sound is relatively low, and the violin sound is relatively high. The frequency of human speech is also relatively high, and the frequency of a woman and a child's voice can be relatively higher.