Values are what we, as a profession, judge to be right. They are more than words-they are the moral, ethical, and professional attributes of character. . . there are certain core values that must be instilled in members of the U.S. Army-civilian and uniformed soldier alike.
Industrial Hygiene. Noise. Full text of hearing conservation program. Materials on acoustics. Noise attentuation. Noise basics. Technical material from NIOSH. Hearing protection devices. Noise induced hearing loss.
Noise isolation does not make use of any power or electronics to block out surrounding noise. Rather, it employs the choice of optimum construction materials and an ergonomic design to block out as much noise as possible from entering the ear canal. Think of it as sound-proofing for your ears.