Human Hearing Frequency


The ear is an amazing body part because it enables humans and animals to hear what goes on around them. Hearing is one of the five senses of the body. The ears help the body to pick up sound waves and vibrations. Sound travels in waves through the air, the ground, and various other substances. Sound cannot be seen, but vibrations can feel it. The number of vibrations that are produced per second is called frequency. Frequency varies for each sound and is measured in hertz. One hertz is equal to one vibration per second. A sound with a low frequency will have a low pitch, such as a human's heartbeat. A sound with a high frequency will have a high pitch, such as a dog whistle. Humans cannot hear sounds of every frequency. The range of hearing for a healthy young person is 20 to 20,000 hertz. The hearing range of humans gets worse with age. People lose the ability to hear sounds of high frequency, as they get older. The highest frequency that a normal middle-aged adult can hear is only 12-14 kilohertz. Also, the hearing range for men worsens more quickly than the hearing range for women. This means that women will have the ability to hear notes of higher pitch than men of the same age do.

Sound

Sound is a longitudinal mechanical wave of any frequency. Frequency is the number of cycles, or complete vibration experienced at each point per unit. Frequency is measured in hertz. The hertz, Hz, is the derived SI unit of frequency. The frequency of a sound wave determines its tone and pitch. The frequency range of a young person is about 20 to 20,000 hertz. The human ear is capable of hearing many of the sounds produced in nature, but certainly not all. Some low frequencies like a heart beat of 1 or 2 Hz cannot be heard, just like sonar sounds produced by dolphins, which are too high.

Frequency

Any frequency that is below the human range is known as infrasound. It is so low that a creature with big ears, such as an Elephant, may detect it. In fact, recent research indicates that elephants also communicate with infrasound. Ultrasound, on the other hand, is above the range of the human ear. Bats, whales, porpoises, and dolphins use ultrasound for navigation. Most bats can detect frequencies as high as 100,000 Hz.

Digital hearing aids
Digital hearing aid has hit the market in a large quantity in the last five years. At last there are twenty-two manufacturers with the digital hearing aids marketed under 40 different model names. Manufacturers are moving towards to their third or...

Disposable hearing aids
designed for people with mild to moderate hearing loss but do not offer a permanent solution to hearing loss. Sometimes billed as "one size fits all," disposable hearing aids actually fit about 80% of adult male ears and about 60% of adult female...

Medicare hearing aids
Hearing is one of the most important attributes that humans have available to them. Through our hearing we are able to communicate verbally and pattern our society with distinct audio tones that help with everyday life. In adults, hearing loss...

Hearing
© hearing.tdrbizl.com 2006