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fundamentals of engineering supplied-reference handbook - Ventech!

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201<br />

INDUSTRIAL ENGINEERING (continued)<br />

ERGONOMICS—HEARING<br />

The average shifts with age <strong>of</strong> the threshold <strong>of</strong> hearing for pure tones <strong>of</strong> persons with "normal" hearing, using a 25-year-old<br />

group as a <strong>reference</strong> group.<br />

Equivalent sound-level contours used in determining the A-weighted sound level on the basis <strong>of</strong> an octave-band analysis. The<br />

curve at the point <strong>of</strong> the highest penetration <strong>of</strong> the noise spectrum reflects the A-weighted sound level.

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