What is “high frequency” and “low frequency”?

First, where does the sound come from?

We know that machines make noise when they run.If we touch the shell of the machine, we often feel that the shell of the machine is vibrating;If the power is cut off, the sound of the machine will disappear as the housing stops vibrating.

This means that the vibration of the object produces the sound.

Frequency?Is a what?

Usually, objects that produce sound due to vibration are called sound sources.

In layman’s terms, a sound source can be a solid, as in the various types of machines mentioned earlier;Sound source can also be liquid and gas, such as flowing water is the result of liquid vibration, wind is the result of gas vibration.

The sound of machinery, water and wind are all waves produced by the vibration of objects, called “sound waves”.

The number of times a sound wave moves in a period is the “frequency” of the sound.Frequency is measured in Hertz (Hz), where 1 Hz = 1 vibration/second.

A human-identifiable frequency of sound waves

The frequency of sound can theoretically range from 0Hz to infinity, but not all waves generated by the vibration of objects can be heard by human ears, only if the frequency of sound waves is within the range of 20-200 hz.

Our faithful companions, dogs, can hear between 50 and 45,000 Hertz, while dolphins can detect frequencies as high as 200,000 Hertz!

High frequency sound?Low frequency sound?Is a what?

The frequency of sound waves varies from high to low.What is high frequency?What is low frequency?

Within the range of sounds audible to human ears, low-frequency sounds refer to those at the frequency range of 20-500hz. In daily life, they are manifested as low and coarse sounds, such as men’s voices, wind, pumps, transformers, earthquakes and thunder.

High-frequency sound refers to the sound in the frequency band of 2000-16000hz, which is manifested as extremely thin sound in life, such as the voice of girls, the voice of mosquitoes flying in the ear “hum — hum”, and the “vibration sound” of mobile phones.

Ultrasonic?What is a

Previously, the range of sound that humans can hear is between 20 and 20, 000hz, and beyond that range is what we commonly call “ultrasound.”

Ultrasonic waves exceed the maximum threshold of 20,000 hz that can be heard by human ears, so we cannot hear, but dogs, dolphins, bats, and others have superior ears that can hear ultrasonic waves.

High frequency hearing loss

High-frequency hearing loss is a very common hearing loss, which will lead to inaudible and have a great impact on life. There are several prominent manifestations as follows:

For example, you can’t hear other people’s voices clearly, especially female voices and children’s voices or small voices;Sound unnatural or uncomfortable;Pronunciation, enunciation is not clear, have “big tongue” phenomenon, do not like to talk, do not like to communicate with everyone;No key sounds with high frequency, such as bird song, insect chirp or telephone ring, can be heard;

High frequency loss is particularly serious friends, in the selection of hearing AIDS to choose the “high frequency remodeling function” of the product,Such as jinghao’s D18 model.

Low frequency hearing loss

For example, due to the low male voice, low-frequency hearing impaired people are prone to the phenomenon of “women can hear clearly while men can’t”.

Because the ear has the function that maintains human body balance, the ear goes wrong, besides can cause hearing loss, still can appear dizzy symptom.

We suggest, want to protect hearing, in addition to want to use less plug type earphone, avoid under high noise environment to stay too long besides, young people still need to pay attention to work and life slack have degree, cannot 24 hours live in the work, do not often stay up late, lest reduce immunity.

For the friend who already has the hearing problem, may ask to match the teacher according to you in the different frequency segment of the listening condition, carries on the debugging