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Ear Protection and Health Sound

The normally functioning human ear can distinguish 345,000 different sounds, the ears being among the body’s most sophisticated sensory devices. The ears tune in to the vast singing, humming, screeching, and whispering world of sound.

Avoid:

Loud noise if possible.

Keep your ears clean.

Ask your physician if any medications you are taking can affect your hearing.

Decibel (abbreviated dB) is defined as one tenth of a bell, a seldom-used unit named for Alexander Graham Bell, inventor of the telephone.

Decibel is used to measure the intensity of sound, and is limited to peak sound pressure level. NRR, or noise reduction (rating, ability to reduce sound energy reaching the ear which is an indicator of how many decibels a hearing protector reduces noise).

The decibel scale is not linear but logarithmic. This means that increasing the decibel level by a factor of 10 actually raises the power of the sound by 10 times the increase.

Our hearing can perceive noise from 0 dB, this is the smallest audible sound. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. By 1,000, 30 dB and so on.

Threshold of Hearing 0dB

Whisper, Watch Ticking 20dB

Quiet Business Office 50dB

Snoring averages 60 dB and can approach 80 or 90dB

Normal Conversation 60dB

Vacuum Cleaner 70dB

Ringing Telephone, Loud Music, Alarm Clock 80dB (loud)

Jet Engine 120dB

140 dB (pain limit)

Hertz (Hz) The standard SI unit of frequency.

Heinrich Rudolf Hertz (1847-1894), German physicist, who proved that electricity can be transmitted in electromagnetic waves, which travel at the speed of light and which possess many other properties of light. His experiments with these electromagnetic waves led to the development of the wireless telegraph and the radio.

Hertz is the unit of frequency equal to one cycle per second:

Hertz (Hz), as in

Kilohertz (kHz) = 1 000 Hz

Megahertz (MHz) = 1 000 KHz

Hertz its range of frequencies characterizes the spectrum of sound. A measure of frequency is cycles per second or Hertz (Hz). Humans can typically hear from about 20 Hz (bass) to 20,000 Hz (treble). However, as we age, the frequency range we can actually hear gets narrower. The following illustrates some of the frequency ranges in movie soundtracks and music:

Piano - 25 Hz to 3,600 Hz

Bass guitar - 30 Hz to 200 Hz

Human voice - 100 Hz to 1,700 Hz

Frequencies lower than 20 Hz is usually felt as vibrations.

Audio and video equipment typically has frequency responses in the range of 20 Hz to 20,000 Hz, with wider frequency response being better. Frequencies lower than 20 Hz is usually felt as vibrations.

Average attenuation value:

Frequency is measured in cycles per second, or Hertz (Hz). The higher the pitch of sound, the higher the frequency. 125 Hz are low tones, 8 kHz (8000 Hz) are high tones. The decibel (abbreviated dB) is used to measure the intensity of a sound, and is limited to peak sound pressure level. At 2 kHz, the unfit on average attenuates 27,7 decibels. Our hearing can perceive noises from 0 dB (hearing threshold) to 140 dB (pain limit).

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