This test method is for single products and evaluates both flame spread and smoke development, assigning different classes based upon test results: Surface of an anechoic wedge has a total surface area greater than the flat surface it replaces.ДЄ measure of the intelligibility of speech.ДЄSTM E 84 - A test method for determining the surface burning characteristics of building materials, sometimes referred to as the вЂњSteiner tunnel testвЂќ. Audio may be analog or digital.Дue to exposed edges and diffraction of sound energy around perimeters, acoustical materials spaced apart can exhibit greater absorption than same amount of material with no gaps. The science of the production, control, transmission, reception and effects of sound and the phenomenon of hearing.ДЄmbience - The residual вЂњroom soundвЂќ of a listening environment.ДЄll pervasive noise associated with a given environment.ДЄnalog - Analog representations of sound replicate its waveform, while transferring it through different media. Note:ДЇor explanation of absorption coefficients exceeding 1.00.ДЄ porous architectural material, usually constructed from fiberglass or pressed board, which is most absorptive at the high frequencies.ДЄcoustics - The sound characteristics of a room. An absorption coefficient of 1.0 = total absorption, 0.0 = total reflection. The absorption coefficient of a material is dependent on the frequency of the sound wave. The portion of energy absorbed when a sound wave strikes a material. Ratio of sound absorbing effectiveness, at a specific frequency, of a unit area of acoustical absorbent to a unit area of perfectly absorptive material. One sabin is the amount of absorption offered by one square foot of open air. Absorption is measured in sabins (after Wallace Clement Sabine). When a sound wave encounters resistance, absorption occurs. Sound absorption results from the conversion of sound energy into another form, usually heat or motion, when passing through an acoustical medium.

Sound trap sound control systems