The range of human hearing is the range of frequencies that the ear is capable of receiving.... This range is not exactly the same for all people and is affected by factors such as age, ear health and the level of ambient noise.... That is why a continuous and quiet sound like the ticking of a clock may not be heard correctly, while the sound of falling on the ground is perfectly understandable... GCORP LLC We answer these questions, what is the threshold of hearing and what is the range of human hearing under normal conditions.

What is the hearing threshold?

When we talk about sound, we have 2 main characteristics of sound intensity and sound frequency.... these two concepts are different, but to understand the threshold of hearing and the range of human hearing, you need to understand their meaning correctly.

1... sound intensity

Intensity means the loudness or quietness of the sound..for example, if someone whispers in the flesh, the sound is quiet and the intensity is low..that is, it is louder...experts measure the intensity of sound with a unit called decibel....zero decibel (0 dB) is the threshold at which the human ear can hear sounds..it means that the sound is very, very quiet....when the sound intensity reaches 120 or 130 decibels, it will be painful for you to bear it This sound can be the sound of gunshots or the take-off of a plane from close range...

The threshold of hearing is the lowest intensity of sound that the human ear can hear at night under normal conditions... You are sitting in a completely silent room and you hear the ticking of the clock... This sound is close to the threshold of human hearing.... In another concrete example, we can mention hearing the sound of a mosquito buzzing in a completely silent environment, which most of us have experienced....

Hearing threshold is measured only by sound intensity, not frequency, so hearing threshold is a number in decibel units.

2.... Sound frequency

Sound frequency is related to how low or low the sound is....Suppose an old man speaks in a low voice and then a child responds in a thin voice....This difference in pitch is due to the frequency measured in hertz (hertz)..20,000 Hz (much lower) is heard.

The range of hearing means the range of sound that the human ear can hear, both in terms of pitch (frequency) and loudness (loudness)....

Suppose you hear the rustling of a leaf on the ground.... This sound has both a frequency, for example, 2500 Hz, which means it is a thin sound, and an intensity, for example, 10 dB, which means that it is very quiet.... If you can hear this sound, it means that you have a good hearing threshold.

What is the reference frequency for human hearing threshold?

According to international standards, the range of human hearing in normal conditions is between zero and 25 dB.. The threshold of human hearing of the Ministry of Health of Iran is also the same range... If you do not react to sounds over 25 dB in the audiometry test, you have hearing loss...

Comparison of human and animal hearing range

The difference in the range of hearing between animals and humans is related to the structure of the ear and the nervous system... because the ear of any creature is exactly like a radio that is tuned to receive specific frequencies... that is, their body is designed to receive and process only parts of the spectrum of sounds.. cells... let's hear the vibrations of an earthquake, that's why we don't hear them, feel that they are very loud and vibrating.

Meanwhile, many animals can understand sounds higher or lower than the frequency range of human hearing.. For example, dogs hear sounds between 40 Hz and 60,000 Hz or even slightly higher, which is why when you use a dog whistle, you don't hear anything, but the dog reacts.

Cats also have very precise hearing....they can hear from about 48 Hz to 85,000 Hz... That's why when a small animal or mouse moves, the cat notices but we don't.

Mice can also hear sounds up to 90,000 or even 100,000 Hz.. This means that the world for them is full of sounds that are incomprehensible to us.

Bats have the record for hearing the following sounds....they hear from 2000Hz to about 120000Hz and act like radar....that's why they can find insects in the dark....

Unlike bats, elephants are better at hearing very low sounds....they can hear sounds around 14-16 Hz....Elephants use these low frequencies to communicate, especially over long distances.

Which diseases, how and to what extent do they affect human hearing?

There are ear diseases that can directly or indirectly affect the range of human hearing. Among them, the following can be mentioned:

Glumous tumor

This mass is a benign tumor that often grows in the middle ear or near the skull... due to the pressure it may exert on the nearby bones or nerves, there is a possibility of hearing impairment and a decrease in the hearing threshold... In this case, the patient hears sounds with a certain frequency, such as a low, weaker voice... Glomus tumor can cause symptoms such as tinnitus, pulsating hearing, and a feeling of ear fullness. slow.

Meniere's disease

In the early stages of Meniere's disease, you probably hear less low sounds....for example, you may not hear the voice of someone who is loud or the sound of a refrigerator clearly....but over time, if the disease is not treated or progresses, the hearing loss extends to other sounds as well..the endolymph is disrupted and the pressure in the ear increases.

Ear stroke (sudden sensorineural hearing loss)

Auricular stroke refers to the sudden loss of hearing (usually nerve) within 3 days.. The cause is unknown, but doctors believe that it is probably caused by a blood flow disorder in the cochlea or viral inflammation.. An ear stroke results in a sudden loss of hearing in one or both ears, usually affecting all spectrums.

Neuroendocrine tumor

Neuroendocrine tumor is very rare and often affects the middle ear. Depending on which part of the ear is affected, it can cause hearing loss, tinnitus or pain.

Presbycusis

Older ear disease occurs with age, during which the patient gradually has difficulty hearing high frequencies, i.e. the following sounds... This is why mothers and grandfathers do not understand their grandchild's words very well.

Auditory neuropathy spectrum disorder

In auditory neuropathy, the ear receives the sound, but the sound message is not properly transmitted to the brain.. Hearing the sound without clear understanding of speech is one of its symptoms.. In auditory neuropathy, a certain frequency may not be lost, but the quality of hearing and speech understanding decreases.

Ear cyst

An ear cyst is any abnormal lump or cavity filled with fluid or dead cells in one part of the ear. The most common type of cyst that damages hearing is a cholesteatoma cyst in the middle ear. This cyst can reduce conductive hearing by pressing on the bones.

Esthetic tube obstruction

The eustachian tube is a narrow and flexible tube that starts from the middle ear (behind the eardrum) and continues to the upper part of the throat and the back of the nose, right to the back of the pharynx. Its most important function is to regulate the air pressure in the ear.

There are several ways to clear a blocked or blocked eustachian tube.. You may just need to sneeze or yawn, or you may need to use medical methods to clear your eustachian tube, which can include methods such as decongestants and antihistamines.

Acoustic neuroma (atrial schwannoma or acoustic neuroma)

Acoustic neuroma is a benign tumor that grows on the auditory balance nerve or vestibular-cochlear nerve.. The most common symptoms of acoustic neuroma are gradual hearing loss in one ear, tinnitus and imbalance. This disease can gradually destroy part of the human hearing range, especially in high frequencies.... Late treatment also affects the overall hearing ability.

Ear cancer

Ear cancer is very rare and can involve areas such as the outer, middle or inner ear.

Does the frontal sinus affect hearing range?

Frontal sinus is a small congenital malformation in front of the ear and usually does not directly affect hearing unless the ear becomes infected or abscessed.

Range of human hearing in several lines

The range of human hearing is a specific range of sounds related to both frequency and intensity....What we hear as sound is only a small part of the sound waves in the environment....This is why soft and quiet sounds like the blowing of the wind may be hidden from our eyes, while sudden and sharp sounds like the dropping of a coin are immediately heard....used in psychiatry and general medicine....its importance is doubled when we know that A slight drop in certain frequencies can be a sign of underlying diseases such as Meniere's or auditory neuropathy.

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Source: betterhearing | Decibel pro