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Glossary of Acoustical Terms <br /> Absorption <br /> The conversion of sound energy into another form of energy, usually <br /> heat, when passing through an acoustical medium. <br /> Absorption coefficient <br /> Ratio of sound absorbing effectiveness, at s specific frequency, of <br /> a unit area of acoustical absorbent to a unit area of perfectly <br /> absorptive material. <br /> Acoustics <br /> The science of the production, control, transmission, reception and <br /> effects of sound and of the phenomenon of hearing. <br /> Ambient noise <br /> All-pervasive noise associated with a given environment. <br /> Amplitude distribution <br /> A method of representing time-varying noise by indicating the <br /> percentage of time that the noise level is present in a series of <br /> amplitude intervals. <br /> Anechoic room <br /> A room whose boundaries effectively absorb all incident sound over <br /> the frequency range of interest, thereby creating essentially free <br /> field conditions. <br /> Audibility threshold <br /> The sound pressure level, for a specified frequency, at which <br /> persons with normal hearing being to respond. <br /> Background noise <br /> The ambient noise level above which signals must be presented or <br /> noise sources measured. <br /> Cumulative distribution <br /> A method of representing time-varying nose by indicating the <br /> percentage of time that the noise level is present above (or below) <br /> a series of amplitude levels. <br /> Damping(1) <br /> The action of frictional or dissipative forces on a dynamic system <br /> causing the system to lose energy and reduce the amplitude of <br /> movement. <br /> Damping(2) <br /> Removal of echoes and reverbation by the use of sound-absorbing <br /> materials. <br /> ALSO: sound proofing <br />