As a person gets older the highest frequency that he or she can detect tends to

# As a person gets older the highest frequency that he

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hearing can hear frequencies between approximately 20 Hz and 20,000 Hz. As a person gets older, the highest frequency that he or she can detect tends to decrease. Human speech frequencies are in the range of 500 Hz to 4,000 Hz. This is significant because hearing loss in this range will interfere with conversational speech. The portions of the ear that detect frequencies between 3,000 Hz and 4,000 Hz are the earliest to be affected by exposure to noise. Audiograms often display a 4,000-Hz "Notch" in patients who are developing the beginning stages of sensorineural hearing loss (OSHA, n.d.). Sound pressure is defined as pressure cause by the vibrations during hearing. The vibrations associated with sound are detected as slight variations in pressure. The range of sound pressures perceived as sound is extremely large, beginning with a very weak pressure causing faint sounds and increasing to noise so loud that it causes pain.(OSHA, n.d.) So as the level of noise increases, so does the pressure that it causes to the worker. Decibel is defined as a unit of sound pressure that was originally discovered by Alexander Graham Bell. This is the measurement by how noise is measured. The decibel notation is implied any time a "sound level" or "sound pressure level" is mentioned. Decibels are measured on a logarithmic scale: a small change in the number of decibels indicates a huge change in the amount of noise and the potential damage to a person's hearing (OSHA, n.d.). Octave band is defined as a type of frequency band. They are a convenient way to measure and describe the various frequencies that are part of a sound. A frequency band is said to be an octave in width when its upper band-edge frequency, f 2 , is twice the lower band-edge frequency, f 1 : f 2 = 2 f 1 . (OSHA, n.d.) Occupational Safety and Health Administration. ( n.d.) OSHA Technical Manual, Section 3, Chapter 5. Retrieved from
• Spring '14
• Bullock
• Frequency, Sound pressure

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